A sewing machine

Abstract

The application provides a sewing machine, and particularly relates to the technical field of sewing machine manufacturing, which has a cloth feeding mechanism, a thread cutting mechanism, a presser foot lifting mechanism and a control system, the cloth feeding mechanism has a cloth feeding driving source and a lifting tooth driving source, the cloth feeding mechanism is driven by the cloth feeding driving source and the lifting tooth driving source to realize the cloth feeding function of the sewing machine, the thread cutting mechanism and the presser foot lifting mechanism have a thread cutting and presser foot lifting driving source, the output shaft of the thread cutting and presser foot lifting driving source is connected with the thread cutting mechanism and the presser foot lifting mechanism to execute the thread cutting and presser foot lifting actions, when the sewing machine ends the needle working, the thread cutting and presser foot lifting driving source executes the thread cutting action of the thread cutting mechanism and the presser foot lifting action of the presser foot lifting mechanism at different times by using the front and rear output shafts, the program of the control system of the cloth feeding mechanism is separated from the thread cutting and presser foot lifting, the intelligent control level of the sewing machine is effectively improved, and the sewing machine has high use and promotion value.

Description

Technical Field

[0001] The present application provides a sewing machine, which specifically relates to the technical field of sewing machine manufacturing. Background Art

[0002] As a sewing tool, a sewing machine requires pre-programmed settings for various sewing stitches and stitch lengths. Our company previously proposed an invention patent for a drive device for thread trimming, presser foot lifting, and stitch length adjustment in a sewing machine. The solution includes the following: when the drive device is in use, the motor rotates according to the settings, and the thread trimming crank and the lifting and pressing cam rotate synchronously with the motor shaft and complete the corresponding actions. When the stitch length needs to be adjusted, the motor shaft rotates to the point where the cam on the lifting and pressing cam abuts against the swinging working surface. The lifting and pressing cam applies a force on the swinging working surface through the cam, thereby pushing the transmission member to swing. The transmission member then drives the swing seat to swing through the connecting rod to adjust the stitch length. Different positions of the cam on the swinging working surface mean different stitch length values. The setting of the two swinging working surfaces enables the drive device to adjust the positive or negative stitch length as needed. A positive stitch length can achieve positive sewing, and a negative stitch length can achieve reverse sewing. During the movement of the cam along the swinging working surface to adjust the stitch length, the mating head is separated from the thread trimming working surface, keeping the thread trimming mechanism stationary, and the presser foot lifter idle travel surface abuts against the rocker arm, keeping the presser foot lifter mechanism stationary. The above scheme adjusts the stitch length by rotating the motor shaft and changing the position of the cam. However, when the stitch length of the sewing machine needs to be changed, the presser foot lifter cam and the cam need to be replaced. A sewing machine often only uses the factory-set stitch length, which cannot meet the sewing needs of the increasing variety of sewing products. The stitch length, thread trimming, and presser foot lifter procedures need to be debugged on a single motor, which is relatively complicated. Summary of the Invention

[0003] The present application proposes a solution to at least one of the above-mentioned technical problems, and is specifically a sewing machine comprising a cloth feeding mechanism, a thread trimming mechanism, a presser foot lifting mechanism and a control system, and is characterized in that the cloth feeding mechanism has a cloth feeding drive source and a tooth lifting drive source, and the cloth feeding mechanism is driven by the cloth feeding drive source and the tooth lifting drive source to realize the cloth feeding function of the sewing machine; the thread trimming mechanism and the presser foot lifting mechanism have a thread trimming and presser foot lifting drive source; the output shafts of the thread trimming and presser foot lifting drive sources are connected to the thread trimming mechanism and the presser foot lifting mechanism to perform the thread trimming and presser foot lifting actions.

[0004] Preferably, when the sewing machine finishes needle work, the thread trimming and presser foot lifting drive source utilizes its front and rear output shafts to successively execute the thread trimming action of the thread trimming mechanism and the presser foot lifting action of the presser foot lifting mechanism at different times.

[0005] Preferably, the cloth feeding mechanism comprises an up and down conveying component and a front and rear conveying component.

[0006] The transmission gear of said sliding panel also is provided with an interlocking plate, and the interlocking plate is connected with a up-down knob. The interlocking plate is hinged on the top of said interlocking plate, and a tooth-lifting driving source is installed in said interlocking plate.

[0007] Preferably, the front and rear transport components have a tooth frame, an insertion rod, a front and rear cloth feed swing assembly and a cloth feed drive source. A positioning groove is also provided on the tooth frame, which is used for the insertion of the above-mentioned insertion rod and transmits the swinging action from the cloth feed drive source to make the tooth frame and even the cloth feed dog produce a forward and backward movement action.

[0008] Preferably, the front and rear cloth feeding swing assembly includes a follower plate, a fixed limit plate, a sliding part, a connecting shaft, an insertion rod, an outer rotating plate and an inner sliding plate, as well as a running groove provided inside the static adjustment bracket. The outer rotating plate has an axial hole for fixing the cloth feeding drive source, the inner sliding plate fits inside the outer rotating plate, one end of the inner sliding plate is connected to the sliding part, and the other end of the inner sliding plate is connected to the connecting shaft. The upper end of the follower plate is connected and fixed with an insertion rod, a bearing is provided between the follower plate and the connecting shaft, the other end of the insertion rod cooperates with the positioning groove of the tooth frame, the fixed limit plate is arranged between the tooth frame and the follower plate, and the insertion rod passes through the limiting part of the fixed limit plate.

[0009] Preferably, the sliding member is configured and operates in the running groove of the static adjustment bracket, the running groove comprises a stitch groove, a transition groove 1, a transition groove 2, a thread trimming groove and a presser foot lifting groove, the stitch groove is located between the transition groove 1 and the transition groove 2, the stitch groove is opposite to the thread trimming groove and the presser foot lifting groove, the stitch groove, the thread trimming groove and the presser foot lifting groove are all arc-shaped, the stitch groove, the thread trimming groove and the presser foot lifting groove are arranged on the same circle center, an axial hole fixed to the cloth feeding drive source is provided on the circle center of the running groove, the running groove is a closed-loop groove around which the sliding member can operate,

[0010] Preferably, the cloth feed drive source moves the sliding part from the needle spacing groove through the second transition groove into the thread trimming groove, so that the connecting shaft is concentric with the front output shaft of the cloth feed drive source. At this time, the cloth feed drive source does not apply an up and down movement to the connecting shaft.

[0011] Preferably, the thread trimming mechanism comprises a thread trimming fork wheel, a thread trimming crank and a thread trimming terminal, the thread trimming fork wheel comprises a thread trimming rod and a return rod, the thread trimming fork wheel is mounted and fixed on the front output shaft of the thread trimming and presser foot lifting drive source, an action rod is provided at the eccentric position of the thread trimming crank, the action rod is located between the thread trimming rod and the return rod, after the thread trimming is completed, the thread trimming and presser foot lifting drive source drives the thread trimming rod to continue to operate until it acts on the return rod to make the entire thread trimming mechanism return to its original position.

[0012] Preferably, the presser foot lifting mechanism has a presser foot lifting cam and a presser foot lifting rod. The presser foot lifting cam is installed on the rear output shaft of the thread trimming and presser foot lifting drive source. The cam portion of the presser foot lifting cam acts on the presser foot lifting rod, and the presser foot lifting rod implements the presser foot lifting action on the presser foot lifting cam.

[0013] Preferably, the thread trimming mechanism and presser foot lifting mechanism are respectively connected to the thread trimming and presser foot lifting drive source and are arranged on one end output shaft. When the action rod is rotated by the thread trimming and presser foot lifting drive source to drive the thread trimming rod to complete the thread trimming, the pressing cam is immediately rotated to perform the presser foot lifting action, and the thread trimming rod completes the return action of the entire thread trimming mechanism under the rotation of the action rod.

[0014] A sewing machine of the present application has a control system for controlling the sewing machine, and the control system executes and realizes the stitch length adjustment mentioned above.

[0015] Compared with the prior art, the cloth feeding mechanism of the new sewing machine of the present application has a cloth feeding drive source and a tooth lifting drive source, and the cloth feeding mechanism is driven by the cloth feeding drive source and the tooth lifting drive source to realize the cloth feeding function of the sewing machine; the thread trimming mechanism and the presser foot lifting mechanism have a thread trimming and presser foot lifting drive source; the output shaft of the thread trimming and presser foot lifting drive source is connected to the thread trimming mechanism and the presser foot lifting mechanism to execute the thread trimming and presser foot lifting actions. When the sewing machine finishes the needle work, the thread trimming and presser foot lifting drive source uses its front and rear output shafts to execute the thread trimming action of the thread trimming mechanism and the presser foot lifting action of the presser foot lifting mechanism at different times, so that the pre-set program of the control system of the cloth feeding mechanism is separated from the thread trimming and presser foot lifting, which effectively improves the intelligent control level of the sewing machine and has high use and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the installation position of a driving source of a sewing machine of the present application;

[0017] Figure 2 This is a front view of a cloth feeding mechanism of a sewing machine of the present application;

[0018] Figure 3 This is a partial exploded structural diagram of a cloth feeding mechanism of a sewing machine of the present application;

[0019] Figure 4 This is a schematic diagram of the connection between the limiting part and the inner sliding plate of a sewing machine of the present application;

[0020] Figure 5 This is a diagram of the installation structure of the tooth frame and feed dog of a sewing machine of the present application;

[0021] Figure 6 This is a structural diagram of a static adjustment bracket for a sewing machine of the present application;

[0022] Figure 7 This is a structural schematic diagram of a swing plate 1 and a swing plate 2 of a sewing machine of the present application;

[0023] Figure 8 It is a schematic diagram of the operating slot of a sewing machine of the present application;

[0024] Figure 9 This is a schematic diagram of a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine of the present application.

[0025] Reference numerals: cloth feeding mechanism 10, cloth feeding drive source 11, tooth lifting drive source 12, swing plate 121, swing plate 2 122, connecting rod 123, circular sliding member 124, tooth rack 13, bobbin core clearance cavity 131, slide groove 132, positioning groove 133, cloth feeding dog 14, front and rear cloth feeding swing assembly 15, follower plate 151, fixed limit plate 152, limit portion 1521, sliding member 153, outer rotating plate 154, inner sliding plate 155, connecting shaft 156, insert rod 157, limit frame 16, static adjustment bracket 21, running slot 211, stitch slot 212, zero point 2121, transition slot 1 213, transition slot 2 214, thread trimming slot 215, presser foot lifting slot 216, thread trimming and presser foot lifting drive source 20, presser foot lifting mechanism 30, presser foot lifting cam 31, presser foot lifting push rod 32, thread trimming mechanism 40, thread trimming fork wheel 41, return rod 411, thread trimming rod 412, thread trimming crank 42, thread trimming end execution end 43. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-9 The preferred embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0027] Figure 1The figure is a diagram of the overall structure of a sewing machine according to the present application. The sewing machine comprises a cloth feed mechanism 10, a thread trimmer mechanism 40, a presser foot lifter mechanism 30, and a control system. The cloth feed mechanism 10 comprises a cloth feed drive source 11 and a thread lifter drive source 12; the thread trimmer mechanism 40 and the presser foot lifter mechanism 30 comprise a thread trimmer and presser foot lifter drive source 20. The cloth feed mechanism 10 is driven by the cloth feed drive source 11 and thread lifter drive source 12; the thread trimmer mechanism 40 and the presser foot lifter mechanism 30 are driven by the thread trimmer and presser foot lifter drive source 20. In addition to driving the cloth feeding action of the cloth feeding mechanism 10, the cloth feeding drive source 11 and the tooth lifting drive source 12 also serve to adjust the stitch length. When the sewing machine finishes sewing, the thread trimming and presser foot lifting drive source 20 drives the thread trimming mechanism 40 and the presser foot lifting mechanism 30 to perform the thread trimming action and the presser foot lifting action. The thread trimming and presser foot lifting drive source 20 uses its front and rear output shafts to successively perform the thread trimming action of the thread trimming mechanism 40 and the presser foot lifting action of the presser foot lifting mechanism 30 at different times. The sewing machine of the present application utilizes three drive sources to realize the sewing operation of the sewing machine, has the advantages of compact structure, simple programming of the sewing machine control system, and can be quickly mass-produced.

[0028] exist Figures 1 to 8 In the figure, the cloth feeding mechanism 10 of the sewing machine includes a tooth frame 13, a feed dog 14 fixed to the tooth frame 13, a front and rear cloth feeding swing assembly 15, a cloth feeding drive source 11 and a tooth lifting drive source 12. The cloth feeding drive source 11 indirectly drives the tooth frame 13; while the cloth feeding drive source 11 indirectly drives the tooth frame 13, the tooth lifting drive source 12 directly drives the same tooth frame 13 to produce a swinging motion, thereby causing the cloth feeding dog 14 connected to the tooth frame 13 to produce a cloth feeding motion for sewing, and the above-mentioned cloth feeding drive source 11 and tooth lifting drive source 12 both realize power output by rotating. The reciprocating rotation of the above-mentioned cloth feeding drive source 11 and tooth lifting drive source 12 is based on the preferred use of a stepper motor or a servo motor, and can thus efficiently realize the control of the sewing action under the control of the control system. The sewing machine of the present application breaks the design concept of traditional sewing machines, removes the original swing seat device, and directly uses a motor to drive the tooth frame 13 and its feed dog 14 to achieve the sewing action. The sewing machine of the present application has a refined structure, and the sewing action of the feed dog 14 is completely controlled by the programming of the control system, which can adapt to the sewing requirements of different sewing stitches and has high technical and promotional value.

[0029] The cloth feeding mechanism 10 comprises an up-and-down transfer assembly and a front-and-rear transport assembly. The up-and-down transfer assembly comprises a tooth frame 13, a swinging disc 1 121, a swinging disc 2 122, a circular sliding member 124, and a tooth-lifting drive source 12. The cloth feeding dog 14 is fixed to the upper portion of the tooth frame 13, a bobbin clearance cavity 131 is provided in the middle portion of the tooth frame 13, and a chute 132 is provided on each side of the tooth frame 13. The bobbin clearance cavity 131 is used to allow the shuttle to make way when the shuttle is used during sewing. The chute 132 on both sides of the tooth frame 13 is matched with a swinging disc 121 and a swinging disc 2 122. The swinging disc 121 and the swinging disc 2 122 are hinged by a connecting rod 123. A circular sliding member 124 is further provided between the swinging disc 121 and the swinging disc 2 122 and the chute 132 of the tooth frame 13. The up-and-down transfer assembly further comprises a limit frame 16, which has the function of limiting the movement position of the tooth frame 13. The tooth lifting drive source 12 is mounted on the static adjustment bracket 21. The front output shaft of the tooth lifting drive source 12 passes through the static adjustment bracket 21 and is fixedly connected to the swing plate 121. The drive from the tooth lifting drive source 12 to the swing plate 121 is a back-and-forth rotation. The swing plate 2 122, under the dynamic connection of the connecting rod 123, also makes the same back-and-forth rotation as the swing plate 121, causing the tooth frame 13 and even the feed dog 14 to move up and down. The swing plate 2 122 is movably connected to the fixed limit plate 152. Therefore, under the back-and-forth rotation of the tooth lifting drive source 12, the synchronous operation of the swing plate 121 and the swing plate 2 122 causes the tooth frame 13 and even the feed dog 14 to move up and down.

[0030] The front-to-back transport assembly comprises a tooth frame 13, an insertion rod 157, a front-to-back feed swing assembly 15, and a feed drive source 11. The tooth frame 13 is also provided with a positioning slot 133. This slot is designed to engage the insertion rod 157 and transmit the swinging motion from the feed drive source 11. Specifically, the feed drive source 11 is connected to the front-to-back feed swing assembly 15, which similarly rotates to drive the tooth frame 13 to swing accordingly. The positioning slot 133 causes the tooth frame 13 and, consequently, the feed dog 14, to generate a forward and backward movement. In this embodiment, the positioning slot 133 is positioned on one side of the swing plate 2 122 of the tooth frame 13. Specifically, the positioning slot 133 is positioned to transmit the swinging motion.

[0031] The tooth frame 13 and its feed dog 14, under the combined action of the tooth lifting drive source 12 and the cloth feeding drive source 11, enable the feed dog 14 to realize the cloth feeding function of the sewing machine, thereby achieving normal sewing. The aforementioned front and rear cloth feeding swing assembly 15 is a key component for the tooth lifting drive source 12 to realize the front and rear cloth feeding action. This is not limited to the specific implementation below. Any components that perform the same function to enable the tooth frame 13 to produce the front and rear cloth feeding action are all within the scope of protection of this application.

[0032] Specific front and back feed cloth swing assembly 15 specifically includes a follow-up plate 151, fixed limit plate 152, sliding member 153, connecting shaft 156, plug rod 157, outer rotating plate 154 and inner sliding plate 155, and the static adjustment bracket 21 inside has a running groove 211. The outer rotating plate 154 has a shaft hole for fixing the feed drive source 11, the inner sliding plate 155 is matched in the inner part of the outer rotating plate 154, one end of the inner sliding plate 155 is connected with the sliding member 153, and the other end of the inner sliding plate 155 is connected with the connecting shaft 156. The upper end of the follow-up plate 151 is fixedly connected with the plug rod 157, the follow-up plate 151 is movably connected with the connecting shaft 156, and a bearing is arranged between the two. The other end of the plug rod 157 is matched with the positioning groove 133 of the tooth frame 13, the fixed limit plate 152 is arranged between the tooth frame 13 and the follow-up plate 151, the plug rod 157 penetrates the limiting part 1521 of the fixed limit plate 152, and the limiting part 1521 is used for limiting the operation range of the plug rod 157.

[0033] Figure 8 It is a schematic view of the motor operation angle of the feed mechanism of the application, and is combined with the above-mentioned other drawings. The sliding member 153 is arranged and operated in the running groove 211 of the static adjustment bracket 21, the running groove 211 is a closed loop groove for the sliding member 153 to surround and operate, the running groove 211 has a stitch groove 212, a transition one groove 213, a transition two groove 214, a thread cutting groove 215 and a presser foot lifting groove 216. The stitch groove 212 is located between the transition one groove 213 and the transition two groove 214, the stitch groove 212 is opposite to the thread cutting groove 215 and the presser foot lifting groove 216, the stitch groove 212 has a stitch adjustment function, the thread cutting groove 215 and the presser foot lifting groove 216 have a function of positioning the zero position in addition to their own thread cutting function and presser foot lifting function, that is, the function of positioning the zero stitch of the feed tooth 14, the zero stitch is the stitch of the sewing machine. The stitch groove 212, the thread cutting groove 215 and the presser foot lifting groove 216 are in arc shape, the stitch groove 212, the thread cutting groove 215 and the presser foot lifting groove 216 are arranged on the same center, and the shaft hole fixed with the feed drive source 11 is arranged on the center.

[0034] The cloth feed mechanism 10 further includes a stitch length adjustment mechanism, which comprises a follower plate 151, a fixed stop plate 152, a slider 153, a connecting shaft 156, an insert rod 157, an outer rotating plate 154, an inner sliding plate 155, a stitch length slot 212, and a cloth feed drive source 11. The slider 153 is located within the stitch length slot 212, which has an arc-shaped cross section. The cloth feed drive source 11 indirectly rotates the slider 153 within the stitch length slot 212 to adjust the stitch length. Specifically, the cloth feeding drive source 11 drives the outer rotating plate 154 in a rotational manner, and the outer rotating plate 154 drives the inner sliding plate 155 and its sliding member 153, so that the sliding member 153 passively operates in the arc-shaped stitch groove 212, and the sliding member 153 swings back and forth in the stitch groove 212, prompting the inner sliding plate 155 to move up and down in the inner sliding plate 155, and the inner sliding plate 155 then drives the connecting shaft 156, and the connecting shaft 156 drives the follower plate 151 and the insert rod 157, so that the tooth frame 13 and the feed dog 14 change the original stitch length to form a new stitch length.

[0035] The cross-sectional center position of the above-mentioned stitch length groove 212 is zero point 2121, and zero point 2121 is the zero stitch length position of the sewing machine. The cloth feed drive source 11 rotates to drive the stitch length groove 212 to implement stitch length adjustment. The zero point 2121 corresponds to the operating position of the cloth feed drive source 11 for stitch length adjustment, which is both the starting position and the ending position. The stitch length adjustment process is that the cloth feed drive source 11 has a starting position and an ending position, and the cloth feed drive source 11 starts at the starting position and ends at the starting position. In other words, the stitch length adjustment of the cloth feed drive source 11 starts at the zero point 2121 position and ends at the zero point 2121 position; the angle at which the cloth feed drive source 11 rotates to both sides at the zero point 2121 determines the size of the stitch length, and the larger the back-and-forth rotation angle of the cloth feed drive source 11, the larger the stitch length; the smaller the back-and-forth rotation angle, the smaller the stitch length. When the back-and-forth rotation angle of the cloth feed drive source 11 is zero degrees, it is the zero stitch length of the sewing machine. On this basis, the sewing machine can achieve different stitch length settings with different back-and-forth rotation angles according to the setting of the control system. There is no need for different stitch lengths to require different stitch length slots 212 as in the prior art, which greatly improves the intelligence level of the stitch length adjustment of the sewing machine and has a high value of promotion and use.

[0036] The operating groove of the sliding member 153 in the needle pitch groove 212 is arc-shaped. In addition, the operating groove of the needle pitch groove 212 of this embodiment can also be set to be flat-angled or wavy. The flat-angled or wavy needle pitch groove 212 achieves the same technical effect as the arc-shaped needle pitch groove 212 when the cloth feed drive source 11 is rotated to achieve needle pitch adjustment. The above-mentioned needle pitch adjustment is achieved when the control system of the present application executes the needle pitch adjustment command program.

[0037] Figure 9is a schematic view of a thread trimming mechanism 40 and a presser lifting mechanism 30 of a sewing machine according to the present application, and a thread trimming and presser lifting driving source 20. The sewing machine has a needle, and after the needle finishes its operation, the sewing machine needs to immediately perform a thread trimming action and then a presser lifting action. The thread trimming and presser lifting driving source 20 performs the above two sewing actions. The feed driving source 11 drives the slide 153 from the needle pitch groove 212 to the transition groove 214 and then to the thread trimming groove 215, so that the connecting shaft 156 is concentric with the front output shaft of the feed driving source 11. Therefore, the slide 153 does not move up and down under the action of the thread trimming groove 215 and the presser lifting groove 216, that is, the slide 153 determines the zero needle pitch position of the feed dog 14 under the action of the thread trimming groove 215 and the presser lifting groove 216, and does not actually affect the needle holder 13.

[0038] After the zero needle pitch position is determined, the thread trimming and presser lifting driving source 20 first starts to perform the thread trimming action. The thread trimming and presser lifting driving source 20 has an output shaft connected to and driving the relevant components of the thread trimming mechanism 40 to perform the thread trimming action. The thread trimming mechanism 40 has a thread trimming fork wheel 41, a thread trimming crank 42, and a thread trimming end execution part 43. The thread trimming fork wheel 41 has a thread trimming rod 412 and a return rod 411, and is fixedly installed on the front output shaft of the thread trimming and presser lifting driving source 20. The eccentric position of the thread trimming crank 42 is provided with an action rod 421, which is located between the thread trimming rod 412 and the return rod 411. When the thread trimming rod 412 is pushed by the driving of the thread trimming and presser lifting driving source 20, the thread trimming end execution part 43 is driven by the thread trimming fork wheel 41 to perform the thread trimming action. After the thread trimming is completed, the thread trimming and presser lifting driving source 20 drives the thread trimming rod 412 to continue to operate until the return rod 411 is acted on to return the entire thread trimming mechanism 40.

[0039] After the above thread trimming action is completed, the slide 153 is driven by the feed driving source 11 to the presser lifting groove 216 to position the zero needle pitch position, and then the thread trimming and presser lifting driving source 20 performs the presser lifting action. The presser lifting mechanism 30 has a presser lifting cam 31 and a presser lifting top rod 32, and the presser lifting cam 31 is installed on the rear output shaft of the thread trimming and presser lifting driving source 20. The presser lifting cam 31 has a cam part acting on the presser lifting top rod 32, and the presser lifting top rod 32 performs the presser lifting action under the action of the presser lifting cam 31.

[0040] The thread trimming mechanism 40 and the presser lifting mechanism are respectively connected to the front and rear output shafts of the double-head output shaft of the thread trimming and presser lifting driving source 20, or can be arranged on one output shaft, and the mode and effect are the same. In addition, when the action rod 421 is rotated by the thread trimming and presser lifting driving source 20 to drive the thread trimming rod 412 to complete thread trimming, the presser lifting cam 31 is rotated to perform the presser lifting action, and the thread trimming rod 412 is rotated by the action rod 421 to complete the return action of the entire thread trimming mechanism 40.

[0041] The above description is only one of the preferred embodiments of the present application, and does not limit the patent implementation scope of the present application. Any equivalent structure or equivalent process transformation using the shape, structure, principle of the content of the specification and drawings, or direct or indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A sewing machine having a cloth feeding mechanism (10), a thread trimming mechanism (40) and a presser foot lifting mechanism (30), characterized in that: The cloth feeding mechanism (10) comprises a cloth feeding drive source (11) and a tooth lifting drive source (12), and the cloth feeding mechanism (10) is driven by the cloth feeding drive source (11) and the tooth lifting drive source (12) to realize the cloth feeding function of the sewing machine; the tooth lifting drive source (12) is installed on the static adjustment bracket (21), and the cloth feeding mechanism (10) also comprises a stitch length adjustment mechanism, which comprises a follower plate (151), a fixed limit plate (152), a sliding member (153), a connecting shaft (156), an inserting rod (157), an outer rotating plate (154) and an inner sliding plate (156). 55), and a needle pitch groove (212) and a cloth feeding drive source (11) provided inside the static adjustment bracket (21), the sliding member (153) is arranged and operates in the running groove (211) of the static adjustment bracket (21), and the cloth feeding drive source (11) indirectly drives the sliding member (153) inside the needle pitch groove (212) in a rotary manner to implement needle pitch adjustment; the running groove (211) includes a needle pitch groove (212), the running groove (211) is provided inside the static adjustment bracket (21), and the needle pitch groove (212) has the function of needle pitch adjustment; The cloth feeding drive source (11) drives the outer rotating plate (154) in a rotary manner, and the outer rotating plate (154) drives the inner sliding plate (155) and its sliding member (153), so that the sliding member (153) passively operates in the arc-shaped needle pitch groove (212). The sliding member (153) swings back and forth in the needle pitch groove (212) to prompt the inner sliding plate (155) to move up and down in the outer rotating plate (154), and the inner sliding plate (155) drives the connecting shaft (156), and the connecting shaft (156) drives the follower plate (151) and the insert rod (157), so that the tooth frame (13 ) and the cloth feeding dog (14) change the original stitch length to form a new stitch length; the outer rotating plate (154) has an axial hole for fixed connection to the cloth feeding drive source (11); the inner sliding plate (155) is matched with the inside of the outer rotating plate (154); one end of the inner sliding plate (155) is connected to the sliding member (153); the other end of the inner sliding plate (155) is connected to the connecting shaft (156); the upper end of the follower plate (151) is connected and fixed with an insertion rod (157); a bearing is provided between the follower plate (151) and the connecting shaft (156); the other end of the insertion rod (157) is matched with the positioning groove (133) of the tooth frame (13); the fixed limiting plate (152) is arranged between the tooth frame (13) and the follower plate (151); the insertion rod (157) passes through the limiting portion (1521) of the fixed limiting plate (152); The thread trimming mechanism (40) and the presser foot lifting mechanism (30) have a thread trimming and presser foot lifting driving source (20); the output shaft of the thread trimming and presser foot lifting driving source (20) is connected to the thread trimming mechanism (40) and the presser foot lifting mechanism (30) to perform thread trimming and presser foot lifting actions; The thread trimming mechanism (40) comprises a thread trimming fork wheel (41), a thread trimming crank (42) and a thread trimming end execution end (43); the thread trimming fork wheel (41) comprises a thread trimming rod (412) and a return rod (411); the thread trimming fork wheel (41) is fixed on the front output shaft of the thread trimming and presser foot lifting driving source (20); an action rod (421) is provided at an eccentric position of the thread trimming crank (42); the action rod (421) is located between the thread trimming rod (412) and the return rod (411); after the thread trimming is completed, the thread trimming and presser foot lifting driving source (20) drives the thread trimming rod (412) to continue to operate until it acts on the return rod (411) so that the entire thread trimming mechanism (40) returns to its original position; The presser foot lifting mechanism (30) comprises a presser foot lifting cam (31) and a presser foot lifting push rod (32); the presser foot lifting cam (31) is mounted on a rear output shaft of a thread trimming and presser foot lifting drive source (20); a cam portion of the presser foot lifting cam (31) acts on the presser foot lifting push rod (32); and the presser foot lifting push rod (32) performs a presser foot lifting action on the presser foot lifting cam (31).

2. A sewing machine according to claim 1, characterized in that: When the sewing machine finishes needle work, the thread trimming and presser foot lifting driving source (20) utilizes its front and rear output shafts to successively execute the thread trimming action of the thread trimming mechanism (40) and the presser foot lifting action of the presser foot lifting mechanism (30) at different times.

3. A sewing machine according to claim 1, characterized in that: The cloth feeding mechanism (10) comprises an up and down conveying component and a front and rear conveying component.

4. A sewing machine according to claim 3, characterized in that: The upper and lower transfer components include a swing plate 1 (121), a swing plate 2 (122), a circular sliding member (124) and a tooth-lifting driving source (12); a cloth feeding tooth (14) is fixed to the upper part of the tooth frame (13); a bobbin-releasing cavity (131) is provided in the middle of the tooth frame (13); a slide groove (132) is provided on both sides of the tooth frame (13); a swing plate 1 (121) and a swing plate 2 (122) are matched on the slide grooves (132) on both sides of the tooth frame (13); the swing plate 1 (121) and the swing plate 2 (122) are hinged by a connecting rod (123); a circular sliding member (124) is further provided between the swing plate 1 (121) and the swing plate 2 (122) and the slide grooves (132) of the tooth frame (13). 4), the up and down transfer assembly also has a limit frame (16), the limit frame (16) has the function of limiting the moving position of the tooth frame (13), the tooth lifting drive source (12) is installed on the static adjustment bracket (21), the front output shaft of the tooth lifting drive source (12) passes through the static adjustment bracket (21) and is fixedly connected to the swing plate 1 (121), the tooth lifting drive source (12) drives the swing plate 1 (121) to rotate back and forth, and the swing plate 2 (122) under the dynamic connection of the connecting rod (123) also makes the same back and forth rotation as the swing plate 1 (121), and the swing plate 2 (122) is dynamically connected to the fixed limit plate (152), so that the tooth frame (13) and even the feed dog (14) produce an up and down transfer action.

5. A sewing machine according to claim 1, characterized in that: The operating groove (211) comprises a needle pitch groove (212), a first transition groove (213), a second transition groove (214), a thread trimming groove (215) and a presser foot lifting groove (216); the needle pitch groove (212) is located between the first transition groove (213) and the second transition groove (214); the needle pitch groove (212) is opposite to the thread trimming groove (215) and the presser foot lifting groove (216); the needle pitch groove (212), the thread trimming groove (215) and the presser foot lifting groove (216) are all in an arc shape; the needle pitch groove (212), the thread trimming groove (215) and the presser foot lifting groove (216) are arranged on the same circle center; an axial hole fixed to the cloth feeding drive source (11) is arranged on the circle center of the operating groove (211); and the operating groove (211) is a closed-loop groove for the sliding member (153) to rotate around.

6. A sewing machine according to claim 1, characterized in that: The cloth feeding drive source (11) moves the sliding member (153) from the needle spacing groove (212) through the second transition groove (214) into the thread trimming groove (215), so that the connecting shaft (156) is concentric with the front output shaft of the cloth feeding drive source (11). At this time, the cloth feeding drive source (11) does not apply an up and down movement to the connecting shaft (156).

7. A sewing machine according to claim 1, characterized in that: The thread trimming mechanism (40) and the presser foot lifting mechanism are respectively connected to the thread trimming and presser foot lifting driving source (20) and are arranged on one output shaft. When the action rod (421) is driven by the thread trimming and presser foot lifting driving source (20) to complete thread trimming, the presser foot lifting cam (31) is rotated to perform the presser foot lifting action. The thread trimming mechanism (40) is returned to its original position by the action rod (421).

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