Separate type lockstitch sewing machine

Abstract

The present application proposes a split-type flat-bed sewing machine, which specifically relates to the technical field of flat-bed sewing machine manufacturing. The flat-bed sewing machine has a frame, a table, a thread-up mechanism and a thread-down mechanism, and is characterized in that the thread-up mechanism at least has a needle bar assembly, a presser foot lifting assembly and a thread-taking assembly, and the thread-down mechanism at least has a feed dog assembly, a rotary hook assembly and a thread-cutting assembly, and there is no mechanical transmission connection between the thread-up mechanism and the frame, and the thread-down mechanism has no mechanical transmission connected to the table. The present application proposes a split-type flat-bed sewing machine, which has an thread-up mechanism and a thread-down mechanism that each operate independently, and cleverly separates the thread-up mechanism and the thread-down mechanism in terms of mechanical transmission, cancels the traditional upper and lower linkage mechanical transmission structure, and realizes the oil-free operation of the flat-bed sewing machine mechanical transmission mechanism without lubrication, simplifies the mechanical structure, and greatly reduces the manufacturing cost of the sewing machine, and has a high promotion value.

Description

Technical Field

[0001] The present application provides a split-type flat-bed sewing machine, and specifically relates to the technical field of flat-bed sewing machine manufacturing. Background Art

[0002] The flat sewing machine is a sewing device for sewing clothes, bags, shoes, hats, and bedding. The spindle motor of the traditional flat sewing machine is connected to the upper spindle. The spindle motor drives the upper spindle to rotate, thereby driving the eccentric rotating wheel, bevel gear, and needle bar crank connected to the upper spindle to operate simultaneously. In the bottom line sewing transmission mechanism, the eccentric rotating wheel drives the feed connecting rod and the tooth lifting connecting rod to operate simultaneously. The feed connecting rod drives the feed shaft to operate through the swing seat assembly, and the tooth lifting connecting rod drives the tooth lifting shaft to swing through the tooth lifting crank; the swing of the feed shaft drives the tooth frame connected to the feed shaft to swing, thereby providing the feed tooth with an approximately horizontal swing, and the swing of the tooth lifting shaft drives the tooth lifting fork connected to the tooth lifting shaft to swing, thereby providing the feed tooth with an approximately up and down swing, and the feed tooth is obtained by combining the horizontal front and back swing and the vertical up and down swing to form the feed tooth running track. At the same time, the bevel gear is connected to the vertical shaft in the vertical direction, and the vertical shaft transmits torque to the lower shaft. The lower shaft is connected and operates the rotary shuttle by changing the gear size to increase the speed by 2 times.

[0003] In summary, the sewing process of a flat-bed sewing machine is actually a process in which the main shaft motor drives the eccentric rotating wheel, bevel gear and needle bar crankshaft on the main shaft to realize the coordinated feeding of the feed dog, presser foot and needle, and the sewing process is accompanied by the operation of the rotary shuttle. The upper and lower linkage transmission mechanism of the traditional flat-bed sewing machine is complex. On the one hand, it causes high noise in the flat-bed sewing machine. On the other hand, the manufacturing standards for the mechanical transmission parts of the flat-bed sewing machine are also high, especially for the rotary shuttle that plays a key role in sewing. Since the flat-bed sewing machine was invented, its traditional mechanical transmission structure has been used until now. A feasible solution is needed to improve the transmission efficiency of the flat-bed sewing machine in order to overcome the above-mentioned technical shortcomings, and at the same time reduce the difficulty of manufacturing the flat-bed sewing machine, reduce the cost of the flat-bed sewing machine, and improve the intelligent control level of the flat-bed sewing machine. Summary of the invention

[0004] In view of the problem of complex mechanical transmission structure in the existing flat-bed sewing machine technology, the present application provides an intelligent flat-bed sewing machine with separated structure and mechanical transmission, comprising a frame, a table, a thread-up mechanism and a thread-down mechanism, characterized in that the thread-up mechanism comprises at least a needle bar assembly, a presser foot lifting assembly and a thread taking-up assembly, the thread-down mechanism comprises at least a feed dog assembly, a rotary hook assembly and a thread trimming assembly, there is no mechanical transmission connection between the thread-up mechanism and the frame, and the thread-down mechanism is not connected to the mechanical transmission on the table.

[0005] Furthermore, the needle bar assembly and the thread take-up assembly are driven by a power source, the presser foot lifter assembly is driven by the presser foot lifter power source, the feed dog assembly is driven by the front and rear feed motors and the up and down lifting motors, the rotary hook assembly is driven by the rotary hook power source, and the thread trimmer assembly is driven by the rotary hook power source and the thread trimmer power source.

[0006] Preferably, the thread feeding mechanism is fixed on the frame, and the needle bar assembly, presser foot lifting assembly and thread take-up assembly are installed and configured inside the head of the flat-bed sewing machine.

[0007] Preferably, the bottom thread mechanism has a fixed seat, the bottom thread mechanism is fixed under the table, and a feed dog assembly, a rotary hook assembly and a thread trimming assembly are arranged inside the fixed seat.

[0008] Preferably, the power source of the needle bar assembly drives the rotating disk to rotate, and a moving connecting rod is connected to the eccentric position of the rotating disk. The moving connecting rod drives the needle crank, and the needle crank drives the needle to move up and down.

[0009] Preferably, the power source of the wire take-up assembly drives the wire take-up reel, and a wire take-up column is arranged at an eccentric position of the wire take-up reel, and the wire take-up column has a wire pulling groove.

[0010] Preferably, the thread take-up assembly further comprises a rotating disk, a thread take-up sub-disk and a thread take-up disk, which are arranged concentrically, and a centrally connected connecting shaft is arranged between the thread take-up sub-disk and the thread take-up disk.

[0011] Preferably, the presser foot lifting power source of the presser foot lifting assembly drives the presser foot cam to rotate, and the presser foot cam acts on a cam action plate on the upper part of the presser foot rod. A spring is installed between the cam action plate and the head of the flat-bed sewing machine and is sleeved on the presser foot rod.

[0012] Preferably, the feed tooth assembly has front and rear feed motors that drive the turntable and then drive the connecting rod, and the output shafts at both ends of the upper and lower lifting motors are respectively equipped with a tooth lifting cam 1 and a tooth lifting cam 2, and the tooth lifting cam 1 and the tooth lifting cam 2 respectively act on the two protrusions at the bottom of the support frame.

[0013] Preferably, the front and rear cloth feed motors are fixed on the rear side of the fixed seat, the output ends of the front and rear cloth feed motors are sleeved on the driving end swing rod of the feed dog connecting frame, and the up and down lifting motor of the feed dog assembly is fixed on the bottom of the fixed seat of the flat sewing machine.

[0014] Preferably, the feed dog is connected to the top of the feed dog connecting frame, and the copper sleeve swing rod and the driving end swing rod at both ends of the feed dog connecting frame are respectively arranged in through holes matching the support frame with the copper sleeve swing rod and the driving end swing rod.

[0015] Preferably, the connecting rod is movably connected to an eccentric position of the turntable, and the turntable is fixed to the output shafts of the front and rear cloth feeding motors.

[0016] Preferably, the two ends of the upper part of the support frame are fixedly connected to the front and rear cloth feeding motors and the fixed copper sleeve, and there is a gap between the two ends of the support frame and the fixed seat that is sufficient to allow the front and rear cloth feeding motors to swing.

[0017] Preferably, support rods are respectively arranged on the front and rear sides of the support frame, and brackets are respectively arranged on the front and rear positions of the up and down lifting motors on the fixed seat. The brackets have grooves for supporting the support rods, and the grooves support the entire support frame on one hand.

[0018] Preferably, the rotary shuttle assembly has a fixed rotary shuttle seat, a thread rack is placed inside the rotary shuttle seat, and an anti-slip cover plate is provided on the outside of the thread rack. The rotary shuttle assembly has a hollow rotating shaft of a rotary shuttle power source to drive the hook needle to hook the sewing upper thread on the needle and form a knot with the sewing lower thread of the thread rack inside the suspended rotary shuttle.

[0019] Preferably, the hollow rotating shaft of the rotary shuttle power source is fixedly connected to the hook needle, the hollow rotating shaft of the rotary shuttle power source is sleeved on a fixed rod connected to the rotary shuttle fixing seat, the running track of the hook needle is concentrically arranged with the fixed rod, and the fixed rod is concentrically arranged with the thread rack.

[0020] Preferably, the thread trimming power source pushes the thread trimming connecting rod, and the thread trimming connecting rod is driven to rotate by the rotary hook power source so that the terminal mechanism performs the thread trimming action.

[0021] Preferably, the push block at the front end of the thread trimmer connecting rod reaches into the notch of the hollow rotating shaft, and the thread trimmer connecting rod generates thrust on the secondary push knife connecting rod and the main push knife connecting rod, and the main push knife holder and the push knife holder are connected to the main knife and push the secondary knife respectively.

[0022] Preferably, the thread trimmer connecting rod has a connecting rod end hinged to the main push knife connecting rod, the secondary push knife connecting rod is hinged to the middle position of the thread trimmer connecting rod, and the middle position of the thread trimmer connecting rod also has a slide groove, the above-mentioned slide groove matches the slide rod arranged on the rotary hook power source / or the thread trimmer power source bracket, and the spring thread trimmer power source bracket and the thread trimmer connecting rod are also provided with springs.

[0023] Preferably, when the rotary hook power source runs the last circle, the operation panel starts the thread trimming action, and after the thread trimming action is completed, the thread trimming power source immediately rebounds to the original position.

[0024] Preferably, the frame is also equipped with an external presser foot mechanism, which has an external presser foot, and the external presser foot is used to press the sewing fabric around the presser foot of the sewing machine.

[0025] Preferably, the external presser foot is connected to an external presser foot connecting rod, the external presser foot connecting rod is connected to a fixing plate, and the fixing plate is connected to an output shaft of an external presser foot driving source.

[0026] Preferably, the external presser foot driving source is mounted and fixed on the long arm end of the frame of the sewing machine.

[0027] Preferably, a lifting device is provided between the table and the frame of the flat-bed sewing machine, the lifting device is used to lift the height of the frame, the lifting power source of the lifting device is installed on the table, and the frame is fixed to the upper end of the lifting rod of the lifting power source.

[0028] Preferably, the frame of the flat-bed sewing machine is further provided with a rotating device, and the frame rotating power source of the rotating device is installed between the frame and the table, and the frame rotating power source is started to drive the frame to rotate.

[0029] The present application discloses a separable flat-bed sewing machine with an independently operated upper thread mechanism and a lower thread mechanism, which cleverly separates the upper thread mechanism and the lower thread mechanism in mechanical transmission, cancels the traditional upper and lower linkage mechanical transmission structure, and realizes oil-free operation of the mechanical transmission mechanism of the flat-bed sewing machine without lubrication. The lower thread mechanism not only has the advantages of high practicality and strong versatility, but also can be manufactured into modular components for use in various flat-bed sewing machines. The separable flat-bed sewing machine of the present application improves the transmission efficiency to the greatest extent, further realizes the intelligent control of sewing, and especially makes subversive technical reforms in structure and mechanical transmission, simplifies the mechanical structure, greatly reduces the manufacturing cost of the sewing machine, and has high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a split-type lockstitch sewing machine of the present application;

[0031] Figure 2 This is a schematic diagram of a separate upper thread mechanism and lower thread mechanism of a lockstitch sewing machine of the present application;

[0032] Figure 3 It is a schematic diagram of the bottom thread mechanism of a split-type lockstitch sewing machine of the present application;

[0033] Figure 4 It is a schematic diagram of a feed dog assembly of a split-type lockstitch sewing machine of the present application;

[0034] Figure 5 It is a schematic diagram of a tooth lifting cam 1 and a tooth lifting cam 2 of a split-type lockstitch sewing machine of the present application;

[0035] Figure 6 It is a rear view of a feed dog assembly of a split-type lockstitch sewing machine of the present application;

[0036] Figure 7 It is a schematic diagram of a feed dog and a feed dog connecting frame of a split-type lockstitch sewing machine of the present application;

[0037] Figure 8It is a schematic diagram of a thread trimming assembly of a split-type lockstitch sewing machine of the present application;

[0038] Fig. 9 It is a schematic diagram of a thread trimmer push rod of a split-type lockstitch sewing machine of the present application;

[0039] Fig.10 This is a diagram of the internal structure of a thread trimmer push rod of a split-type lockstitch sewing machine of the present application;

[0040] Fig.11 It is a schematic diagram of a rotary hook assembly of a split-type lockstitch sewing machine of the present application;

[0041] Fig.12 It is a schematic diagram of a guide rail of a split-type lockstitch sewing machine of the present application;

[0042] Fig.13 It is a schematic diagram of a pattern sewing stitch of a split-type flat sewing machine of the present application;

[0043] Fig.14 It is a schematic diagram of intermittent stitches of a pattern sewing machine of a split type in the present application.

[0044] Figure 1: threading mechanism 10, machine head 11, needle bar assembly 15, needle 152, power source 153, rotating disk 154, moving connecting rod 155, needle crank 156, presser foot lifting assembly 16, presser foot 161, presser foot lifting power source 162, presser foot cam 163, cam action plate 164, spring 165, presser foot rod 166, external presser foot mechanism 18, external presser foot 181, external presser foot connecting rod 182, fixing plate 183, external presser foot power source 184, Bottom line mechanism 20, fixed seat 23, feed dog assembly 25, feed dog 251, up and down lifting motor 252, front and rear feed motor 253, feed dog connecting frame 254, support frame 255, tooth lifting cam 1 256, tooth lifting cam 257, needle plate 258, fixed copper sleeve 259, drive end swing rod 25a, copper sleeve swing rod 25b, turntable 25e, connecting rod 25f, bracket 250, support rod 25c, groove 25d, rotary hook assembly 26, suspension Rotary hook 261, rotary hook power source 262, notch 26c, hook needle 263, fixing rod 264, rotary hook fixing seat 265, anti-slip cover plate 266, hollow shaft 267, thread rack 268, thread trimming assembly 27, thread trimming power source 271, thread trimming connecting rod 272, push block 272a, connecting rod end 272b, slide groove 272c, thread trimming power source bracket 27e, spring 273, main knife 274, main push knife connecting rod 275, push secondary knife 276, thread trimming bracket 2 77, main push knife holder 278, secondary push knife connecting rod 279, push knife holder 270, frame 30, long arm end 31, operation panel 40, controller 50, table 60, lifting power source 70, lifting rod 71, frame rotation power source 72, main rail 81, secondary guide rail 82, working guide rail 83, thread taking-up assembly 90, take-up sub-disc 91, take-up disc 92, take-up column 921, thread taking-up connecting rod 93, thread clamp 1 94, thread clamp 2 95, thread taking-up shaft 96. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings 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 implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention.

[0046] Figure 1 Figure 2 1 is a structural schematic diagram of a split-type flat sewing machine of the present application, which comprises an upper thread mechanism 10, a lower thread mechanism 20, a frame 30, an operation panel 40, a controller 50 and a table 60. The upper thread mechanism 10 and the operation panel 40 are fixed on the frame 30, and specifically, the upper thread mechanism 10 is fixed on the long arm end 31 of the frame 30. The lower thread mechanism 20 is fixed under the table 60, the operation panel 40 is fixed in the middle of the frame 30, the operation surface of the operation panel 40 faces the operator, and the frame 30 is fixed on the table 60.

[0047] The thread-up mechanism 10 and the thread-down mechanism 20 constitute a sewing system with the function of a lockstitch sewing machine. The thread-up mechanism 10 is fixed to the frame 30 at the long arm end 31 of the frame 30, or is an integrated structure. The thread-down mechanism 20 is installed on the table 60 near the thread-up mechanism 10. The thread-down mechanism 20 has a fixed seat 23, and at least a needle bar assembly 15, a presser foot lifting assembly 16 and a thread-taking assembly 90 are installed inside the fixed seat 23. The fixed seat 23 is fixed under the frame 30. There is no mechanical transmission connection between the thread-up mechanism and the frame, and the thread-down mechanism has no mechanical transmission connected to the table. The separate intelligent lockstitch sewing machine of the present application is separated in structure and separated in mechanical transmission.

[0048] The present application sets and manufactures the bottom thread mechanism 20 into a modular structure, so as to facilitate installation on various machine models. The optimized flat sewing machine of the present application has the advantage of simple structure, and the transmission mechanism of the flat sewing machine adopts a separate and pioneering design.

[0049] The thread feeding mechanism 10 of the lockstitch sewing machine has a machine head 11, and the machine head 11 is fixed on the frame 30. The thread feeding mechanism 10 is composed of at least a needle bar assembly 15, a presser foot lifting assembly 16 and a thread taking-up assembly 90, and the needle bar assembly 15, the presser foot lifting assembly 16 and the thread taking-up assembly 90 work together to realize the thread feeding sewing task during the sewing process.

[0050] Figure 2 In the figure, the needle bar assembly 15 comprises a needle 152, a power source 153, a rotating disk 154, a moving link 155 and a needle crank 156. The power source 153 drives the rotating disk 154 to rotate, and a moving link 155 is connected to the eccentric position of the rotating disk 154. The moving link 155 drives the needle 152 to reciprocate up and down under the drive of the rotating disk 154.

[0051] The presser foot lifting assembly 16 comprises a presser foot 161, a presser foot lifting power source 162, a presser foot cam 163, a cam action plate 164, a presser foot rod 166 and a spring 165. The presser foot lifting power source 162 drives the presser foot cam 163 to rotate, and the presser foot cam 163 acts on the cam action plate 164 provided on the upper part of the presser foot rod 166. A spring 165 is installed between the cam action plate 164 and the machine head 11, and the spring 165 is sleeved on the presser foot rod 166. The presser foot lifting power source 162 drives the above-mentioned related components to perform the lifting action of the presser foot 161. The presser foot 161 of the present application is in a normal pressure state. When it is to be lifted, the presser foot lifting power source 162 rotates to make the presser foot cam 163 leave the cam action plate 164, and the spring 165 pushes the cam action plate 164 to lift the presser foot 161. When the presser foot is to be pressed, the presser foot cam 163 leaves the cam action plate 164, and the spring 165 presses the presser foot rod 166 to keep the presser foot 161 pressed down; during the sewing process, the spring 165 always gives the presser foot 161 a maintaining elastic force between the cam action plate 164 and the machine head 11 to achieve constant pressure of the presser foot.

[0052] exist Figures 2 to 8 The fixing seat 23 of the bottom thread mechanism 20 is provided with a feed dog assembly 25, a rotary hook assembly 26 and a thread trimming assembly 27. The feed dog assembly 25 comprises a feed dog 251, a support frame 255, a bracket 250, a feed dog connecting frame 254, an up and down lifting motor 252 and a front and rear feed motor 253. The front and rear feed motor 253 is fixed to the rear side of the fixing seat 23, and a turntable 25e is sleeved on the output end of the front and rear feed motor 253.

[0053] The up-down lifting motor 252 is fixed at the bottom of the fixed seat 23. The output shafts at both ends of the up-down lifting motor 252 are respectively installed with a tooth lifting cam 1 256 and a tooth lifting cam 257. The tooth lifting cam 1 256 and the tooth lifting cam 257 act on the two protrusions at the bottom of the support frame 255. The upper ends of the support frame 255 are provided with front and rear cloth feeding motors 253 and fixed copper sleeves 259. There is a gap between the two ends of the support frame 255 and the fixed seat 23 sufficient to meet the swing of the front and rear cloth feeding motors 253. Support rods 25c are respectively provided on the front and rear sides of the support frame 255. Brackets 250 are respectively provided at the front and rear positions of the up-down lifting motor 252 on the fixed seat 23. The groove 25d on the top of the bracket 250 is used to support the support rod 25c. The groove 25d supports the entire support frame 255, so that the cloth feeding tooth assembly 25 swings left and right in the groove 25d. The up and down lifting motor 252 controlled by the operation panel 40 makes a rotation motion, driving the tooth lifting cam 1 256 and the tooth lifting cam 2 257 to rotate. Since the tooth lifting cam 1 256 and the tooth lifting cam 2 257 have the characteristic of unequal diameters, the support frame 255 makes an up and down swinging motion to meet the feed dog 251, thereby driving the feed dog 251 to swing up and down.

[0054] The feed dog connecting frame 254 is connected to the feed dog 251 at the top, and the copper sleeve swing rod 25b and the driving end swing rod 25a at both ends of the feed dog connecting frame 254 are respectively arranged in the through holes of the support frame 255 that match the copper sleeve swing rod 25b and the driving end swing rod 25a. The feed dog connecting frame 254 is movably connected to a connecting rod 25f, and the connecting rod 25f is movably connected to a turntable 25e. The connecting rod 25f is movably connected to an eccentric position of the turntable 25e, and the turntable 25e is fixed to the output shaft of the front and rear feed motors 253. The front and rear feed motors 253 controlled by the operation panel 40 drive the turntable 25e and then drive the connecting rod 25f, so that the feed dog connecting frame 254 makes a swing source that satisfies the left and right swinging action of the feed dog 251, thereby driving the feed dog 251 to swing left and right. Under the control of the above-mentioned operation panel 40, the left and right swinging action made by the front and rear feed motors 253 and the up and down swinging action made by the up and down lifting motor 252 are transmitted to the feed dog 251 through the feed dog connecting frame 254, forming a feed dog 251 in an action state, thereby realizing the feeding action of the feed dog 251 of the present flat sewing machine.

[0055] The fixing seat 23 also has a needle plate 258 connected to the fixing seat 23 as a whole. The fixing seat 23 rotates together with the needle plate 258, and the feed dog 251 of the feed dog assembly 25 operates in the needle plate 258. The up-and-down lifting motor 252 and the front-and-back feed motor 253 are controlled by the operation panel 40 to realize programmed control in the adjustment of the sewing stitch length, which overcomes the traditional method of adjusting the stitch length of the original lockstitch sewing machine and has epoch-making technical value.

[0056] Figure 8 Fig. 9 and Fig.10In the embodiment, the thread trimming assembly 27 comprises a rotary shuttle power source 262, a hollow rotating shaft 267, a push knife holder 270, a thread trimming power source 271, a thread trimming connecting rod 272, a spring 273, a main knife 274, a main push knife connecting rod 275, a secondary push knife 276, a thread trimming bracket 277, a main push knife holder 278 and a secondary push knife connecting rod 279. When sewing is almost finished, when the rotary shuttle power source 262 runs the last circle, the operation panel 40 can start the thread trimming action, firstly, the thread trimming power source 271 is started to push the thread trimming connecting rod 272, and the pushing block 272a at the front end of the thread trimming connecting rod 272 reaches the notch 26c of the hollow rotating shaft 267, so that the running hollow rotating shaft 267 drives the thread trimming connecting rod 272 to rotate, and the rotating thread trimming connecting rod 272 pushes the thread trimming end mechanism to perform the thread trimming action. The rotating thread trimming link 272 generates thrust on the secondary push knife link 279 and the main push knife link 275, thereby the main push knife holder 278 and the push knife holder 270. The above-mentioned main push knife holder 278 and the push knife holder 270 are connected to the main knife 274 and the push secondary knife 276 respectively, and the main knife 274 and the push secondary knife 276 are connected under the push of the main push knife holder 278 and the push knife holder 270 to complete the thread trimming action. The connecting rod end 272b of the above-mentioned thread trimming connecting rod 272 is hinged with the main push knife connecting rod 275, and the secondary push knife connecting rod 279 is hinged with the middle position of the thread trimming connecting rod 272. The middle position of the thread trimming connecting rod 272 also has a slide groove 272c, and the above-mentioned slide groove 272c matches the slide bar 262a set on the rotary hook power source 262 or the thread trimming power source bracket 27e. The spring 273 thread trimming power source bracket 27e and the thread trimming connecting rod 272 are also provided with a spring 273. After completing the thread trimming action, the thread trimming power source 271 immediately rebounds to the original position, and the thread trimming connecting rod 272, the main knife 274 and the push secondary knife 276 also return to the original position.

[0057] Fig.10 Fig.11 In the figure, the rotary hook assembly 26 comprises a suspended rotary hook 261, a rotary hook fixing seat 265, an anti-skid cover plate 266, a thread rack 268, a rotary hook power source 262 and a hook needle 263. When the lockstitch sewing machine is sewing, the rotary hook fixing seat 265 is fixed, a thread rack 268 is placed inside the rotary hook fixing seat 265, and an anti-skid cover plate 266 is arranged outside the thread rack 268, and the anti-skid cover plate 266 is used for the thread rack 268 to slide out. The rotary hook power source 262 drives the hook needle 263 to hook the sewing upper thread on the needle 152 and the sewing lower thread of the thread rack 268 in the suspended rotary hook 261 to form a knot. The hook needle 263 is fixedly connected to the hollow shaft 267 of the rotary hook power source 262, and the hollow shaft 267 of the rotary hook power source 262 is sleeved on the fixed rod 264 of the rotary hook fixing seat 265. The running track of the hook needle 263 is concentrically arranged with the fixed rod 264, and the fixed rod 264 is concentrically arranged with the thread rack 268. The suspended rotary hook 261 and the rotary hook fixing seat 265 have a sliding line gap and a positioning setting, and the suspended rotary hook 261 and the anti-slip cover plate 266 have a sliding line gap.

[0058] exist Fig.12 In the present application, the flat sewing machine has a cloth positioning device, which has a main rail 81, a secondary rail 82 and a working rail 83. The main rail 81 is fixedly mounted on the table 60, and the secondary rail 82 is movably connected to the main rail 81, and one end of the secondary rail 82 operates within the limit of the main rail 81; the working rail 83 is located at the periphery of the feed dog 251, and one side of the working rail 83 is movably connected to the secondary rail 82, and this side of the working guide 83 operates within the limit of the secondary guide 82. During sewing, the cloth is arranged and fastened on the working guide 83, and the working guide 83 moves with the change of the sewing stitch. Specifically, the transverse stitch is the working guide 83 operating within the range of the secondary guide 82, the longitudinal stitch is the secondary guide 82 operating within the range of the main rail 81, and the other stitches are completed by the cooperative operation of the secondary guide 82 and the main rail 81, so that the pattern sewing of the flat sewing machine has a high controllability.

[0059] exist Fig.13 and Fig.14 In the present application, a thread take-up assembly 90 of a separate flat-bed sewing machine comprises a thread take-up sub-disk 91, a thread take-up disk 92, a thread take-up rotating shaft 96, a thread clamp 1 94, a thread clamp 2 95, a thread take-up connecting rod 93, a power source 153 and a rotating disk 154. A thread take-up post 921 is fixedly arranged at an eccentric position of the thread take-up disk 92, and the thread take-up post 921 has a wire drawing groove. The sewing thread is led from between the thread clamp 1 94 and the thread clamp 2 95 to the wire drawing groove of the thread take-up post 921, and the sewing thread is sleeved on the wire drawing groove. The thread take-up disk 92 and the thread take-up post perform a circular operation together, and the thread take-up post 921 takes up or releases the sewing thread with the change of the position of the thread take-up post 921 under the circular operation. The rotating disk, the thread take-up sub-disk and the thread take-up disk of the thread take-up assembly are concentrically arranged, and a thread take-up shaft 96 connected centrally is arranged between the thread take-up sub-disk 91 and the thread take-up disk 92. The take-up disk 92 and the take-up sub-disk 91 are connected and driven by the thread take-up shaft 96. Both the rotating disk 154 and the take-up sub-disk 91 are provided with a synchronous thread take-up connecting rod 93 at an eccentric position. When the rotating disk 154 is driven by the power source 153 to rotate continuously, the rotating disk 154 drives the thread take-up connecting rod 93, and the thread take-up connecting rod 93 drives the needle 152 and the take-up sub-disk 91 to operate at the same time. The take-up disk 92 finally drives the take-up column 921 to perform the thread take-up work. The take-up sub-disk 91 thus drives the take-up disk 92 to operate through the thread take-up shaft 96. The thread take-up assembly 90 of the present application has a simple structure, and the thread take-up speed is consistent with the operation of the needle 152, so that the thread take-up and thread release of the sewing thread are more accurate, and the intelligent control level of the flat-bed sewing machine is improved.

[0060] It should be pointed out here that the rotation of the take-up drum 92 is not limited to the above-mentioned transmission mechanism, and any solution that can drive the take-up drum 92 of the present application to rotate in a circle is sufficient.

[0061] Fig.14 The lockstitch sewing machine of the present application also has an external presser foot mechanism 18, which is composed of an external presser foot 181, an external presser foot connecting rod 182, a fixing plate 183 and an external presser foot power source 184. The external presser foot power source 184 is installed and fixed on the frame 30, and the external presser foot power source 184 drives the external presser foot 181 to press the sewing cloth on the table 60. The external presser foot 181 prevents the cloth from sliding under the sewing state and affects the production process of the next sewing. The external presser foot 181 is pressed around the presser foot 161, either in a round shape or in a square shape, etc. In short, the presser foot 161 is within the pressing range of the external presser foot 181. The outer presser foot 181 is connected to the outer presser foot connecting rod 182, the outer presser foot connecting rod 182 is connected to the fixed plate 183, the fixed plate 183 is connected to the output shaft of the outer presser foot power source 184, and the outer presser foot power source 184 performs a telescopic operation to drive the fixed plate 183 to move, thereby realizing the pressing or releasing of the outer presser foot 181 when sewing fabric.

[0062] exist Figure 1 In the present sewing machine, a lifting device is further provided between the table 60 and the frame 30. The lifting device is used to lift the height of the frame 30. When thicker fabrics need to be sewn, the frame 30 can be raised. After the fabrics are placed, the frame 30 can be lowered to the original height for sewing. Specifically, a lifting power source 70 is installed on the table 60. The frame 30 is fixed on the upper end of a lifting rod 71 of the lifting power source 70. When the lifting power source 70 is started, the lifting rod 71 is lifted and lowered to realize the lifting and lowering of the frame 30.

[0063] exist Figure 1 In the present sewing machine, the frame 30 is also provided with a rotating device, which rotates the frame 30 on the table 60, and the purpose is to rotate the frame 30 together with the thread-up mechanism 10 to a certain angle to meet the needs of special sewing. After the fabric is placed, the frame 30 is returned to its original position and sewing can be carried out. The frame rotation power source 72 is installed between the frame 30 and the table 60, and the frame rotation power source 72 is started to drive the frame 30 to rotate.

[0064] In summary, the upper thread mechanism 10 and the lower thread mechanism 20 constitute a sewing system with the function of a flat-bed sewing machine, realizing the conventional sewing function of the flat-bed sewing machine.

[0065] The above are only preferred implementations of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A split-type lockstitch sewing machine, comprising a frame (30), a table (60), an upper thread mechanism (10) and a lower thread mechanism (20), characterized in that: The thread-up mechanism (10) at least comprises a needle bar assembly (15), a presser foot lifting assembly (16) and a thread-taking assembly (90); the thread-down mechanism (20) at least comprises a feed dog assembly (25), a rotary hook assembly (26) and a thread-cutting assembly (27); there is no mechanical transmission connection between the thread-up mechanism (10) and the frame (30); and the thread-down mechanism (20) has no mechanical transmission connection on the table (60); The rotary hook assembly (26) comprises a suspended rotary hook (261), a fixed rod (264), a rotary hook fixed seat (265), an anti-skid cover plate (266), a hollow rotating shaft (267), a thread rack (268), a rotary hook power source (262) and a hook needle (263); the rotary hook fixed seat (265) is fixed, a thread rack (268) is placed inside the rotary hook fixed seat (265), an anti-skid cover plate (266) is arranged outside the thread rack (268), and the anti-skid cover plate (266) is used to prevent the thread rack (268) from sliding out; the hook needle (263) is fixedly connected to the hollow rotating shaft (267), the hollow rotating shaft (267) is sleeved on the fixed rod (264), the running track of the hook needle (263) is concentrically arranged with the fixed rod (264), and the fixed rod (264) and the thread rack (268) are concentrically arranged; The thread trimming assembly (27) is driven by a rotary hook power source (262) and a thread trimming power source (271). When the rotary hook power source (262) rotates for the last turn, the operation panel (40) can start the thread trimming action. First, the thread trimming power source (271) is started to push the thread trimming connecting rod (272). The pushing block (272a) at the front end of the thread trimming connecting rod (272) reaches the notch (26c) of the hollow rotating shaft (267). The hollow rotating shaft (267) drives the thread trimming connecting rod (272) to move. ) rotates, and the rotating thread trimming connecting rod (272) generates thrust on the secondary push knife connecting rod (279) and the main push knife connecting rod (275), thereby pushing the main push knife holder (278) and the push knife holder (270), wherein the main push knife holder (278) and the push knife holder (270) are respectively connected to the main knife (274) and the push secondary knife (276), and the main knife (274) and the push secondary knife (276) complete the thread trimming action when the main push knife holder (278) and the push knife holder (270) push each other.

2. A split-type lockstitch sewing machine according to claim 1, characterized in that: The thread-feeding mechanism (10) comprises a machine head (11), the thread-feeding mechanism (10) is fixed on a machine frame (30), and the needle bar assembly (15), the presser foot lifting assembly (16) and the thread-taking assembly (90) are installed and arranged inside the machine head (11).

3. A split-type lockstitch sewing machine according to claim 1, characterized in that: The bottom thread mechanism (20) has a fixed seat (23). The bottom thread mechanism (20) is fixed under a table (60). A feed tooth assembly (25), a rotary hook assembly (26) and a thread trimming assembly (27) are arranged inside the fixed seat (23).

4. A split-type lockstitch sewing machine according to claim 1 or 2, characterized in that: The power source (153) of the needle bar assembly (15) drives the rotating disk (154) to rotate. A movable connecting rod (155) is connected to the eccentric position of the rotating disk (154). The movable connecting rod (155) drives the needle crank (156). The needle crank (156) drives the needle (152) to move up and down.

5. A split-type lockstitch sewing machine according to claim 1 or 2, characterized in that: The thread taking-up assembly (90) comprises a power source (153), a rotating disk (154), a thread taking-up sub-disk (91), a thread taking-up connecting rod (93), a thread taking-up rotating shaft (96) and a thread taking-up disk (92). The rotating disk (154) is driven by the power source (153) to continuously rotate, the rotating disk (154) drives the thread taking-up connecting rod (93), the thread taking-up connecting rod (93) drives the thread taking-up sub-disk (91) to operate, the thread taking-up sub-disk (91) and the thread taking-up disk (92) are connected and driven by the thread taking-up rotating shaft (96), and the thread taking-up disk (92) finally drives the thread taking-up column (921) to perform the thread taking-up operation.

6. A split-type lockstitch sewing machine according to claim 5, characterized in that: The rotating disk (154), the take-up sub-disk (91) and the take-up disk (92) are arranged concentrically. A centrally connected thread-taking rotating shaft (96) is arranged between the take-up sub-disk (91) and the take-up disk (92). A take-up column (921) is arranged at an eccentric position of the take-up disk (92). The take-up column (921) has a thread drawing groove, and the sewing thread is sleeved on the thread drawing groove.

7. A split-type lockstitch sewing machine according to claim 1 or 2, characterized in that: The presser foot lifting assembly (16) comprises a presser foot lifting power source (162), a presser foot cam (163), a cam action plate (164), a spring (165) and a presser foot rod (166); the presser foot lifting power source (162) drives the presser foot cam (163) to rotate; the presser foot cam (163) acts on the cam action plate (164) provided on the upper part of the presser foot rod (166); a spring (165) is installed between the cam action plate (164) and the machine head (11); and the spring (165) is sleeved on the presser foot rod (166).

8. A split-type lockstitch sewing machine according to claim 1 or 2, characterized in that: The feed tooth assembly (25) comprises front and rear feed motors (253), an up and down lifting motor (252) and a support frame (255); the front and rear feed motors (253) drive a turntable (25e) and then drive a connecting rod (25f); output shafts at both ends of the up and down lifting motors (252) are respectively provided with a tooth lifting cam 1 (256) and a tooth lifting cam 2 (257); the tooth lifting cam 1 (256) and the tooth lifting cam 2 (257) act on two protrusions at the bottom of the support frame (255) respectively; the feed tooth connecting frame (254) is connected to the feed tooth (251) at the top; the copper sleeve swing rod (25b) and the driving end swing rod (25a) at both ends of the feed tooth connecting frame (254) are respectively arranged in through holes matching the support frame (255) with the copper sleeve swing rod (25b) and the driving end swing rod (25a); the feed tooth connecting frame (254) is movably connected with the connecting rod (25f).

9. A split-type lockstitch sewing machine according to claim 8, characterized in that: The front and rear cloth feeding motor (253) is fixed on the rear side of the fixing seat (23), a turntable (25e) is arranged on the output end of the front and rear cloth feeding motor (253), and the up and down lifting motor (252) is fixed on the bottom of the fixing seat (23).

10. A split-type lockstitch sewing machine according to claim 8, characterized in that: The connecting rod (25f) is movably connected to the eccentric position of the rotating disk (25e), and the rotating disk (25e) is fixed on the output shaft of the front and rear cloth feeding motors (253).

11. A split-type lockstitch sewing machine according to claim 8, characterized in that: The two ends of the upper part of the support frame (255) are respectively fixedly connected with the front and rear cloth feeding motors (253) and the fixed copper sleeves (259), and there is a gap between the two ends of the support frame (255) and the fixed seat (23) sufficient to allow the front and rear cloth feeding motors (253) to swing.

12. The split-type lockstitch sewing machine according to claim 8, characterized in that: Support rods (25c) are respectively arranged on the front and rear sides of the support frame (255), and brackets (250) are respectively arranged on the front and rear positions of the up and down lifting motor (252). The bracket (250) has a groove (25d) for supporting the support rod (25c), and the groove (25d) supports the entire support frame (255).

13. A split-type lockstitch sewing machine according to claim 1, characterized in that: The thread trimming link (272) has a link end (272b), the link end (272b) is hinged with the main push knife link (275), the secondary push knife link (279) is hinged with the middle position of the thread trimming link (272), the middle position of the thread trimming link (272) also has a slide groove (272c), the above-mentioned slide groove (272c) matches the slide rod (262a) arranged on the thread trimming power source bracket (27e), and a spring (273) is also arranged between the thread trimming power source bracket (27e) and the thread trimming link (272).

14. A split-type lockstitch sewing machine according to claim 1, characterized in that: When the rotary hook power source (262) runs the last circle, the operation panel (40) starts the thread trimming action, and after the thread trimming action is completed, the thread trimming power source (271) immediately rebounds to the original position.

15. The split-type lockstitch sewing machine according to claim 1, characterized in that: The frame (30) is also equipped with an external presser foot mechanism (18), which comprises an external presser foot (181), an external presser foot connecting rod (182), a fixing plate (183) and an external presser foot driving source (184). The external presser foot (181) is used to press the sewing fabric around the presser foot (161) of the sewing machine. The external presser foot (181) is connected to the external presser foot connecting rod (182), the external presser foot connecting rod (182) is connected to the fixing plate (183), and the fixing plate (183) is connected to the output shaft of the external presser foot driving source (184).

16. A split-type sewing machine according to claim 15, characterized in that: The external presser foot driving source (184) is fixedly mounted on the long arm end (31) of the frame (30).

17. A split-type lockstitch sewing machine according to claim 1, characterized in that: A lifting device is also provided between the table (60) and the frame (30) of the lockstitch sewing machine. The lifting device is used to lift the height of the frame (30). The lifting device comprises a lifting power source (70) and a lifting rod (71). The lifting power source (70) is installed on the table (60), and the frame (30) is fixed to the upper end of the lifting rod (71) of the lifting power source (70).

18. The split-type lockstitch sewing machine according to claim 1, characterized in that: The frame (30) is also provided with a rotating device, which has a frame rotating power source (72). The frame rotating power source (72) is installed between the frame (30) and the table (60). The frame rotating power source (72) starts to drive the frame (30) to rotate.

Images