Overedge Sewing Machine with Auxiliary Feeding Device

Abstract

The present invention discloses a blind hemming machine with an auxiliary feeding device, which includes a workbench, a sewing head, a draw tube, a thread cutting mechanism and a presser foot assembly. The mounting table plate of the workbench is horizontally and fixedly arranged on the upper end of the rear part of the machine frame. The sewing head is fixedly arranged on the mounting table plate, and its front cantilever extends forward out of the mounting table plate. The needle plate is fixedly arranged on the left part of the cantilever and is located below the sewing needle. The draw tube is used to join and hem two pieces of fabric. The thread cutting mechanism is used to cut the thread on the sewn fabric. The presser foot assembly is arranged on the front part of the sewing head, above the needle plate in the cantilever, and cooperates with the feed dog in the cantilever to feed the material. The key point is that it further includes an auxiliary feeding device. The auxiliary feeding device includes a transmission device and a drag wheel device. The drag wheel device includes a feeding synchronous belt, and the main shaft on the sewing head of the sewing head drives the feeding synchronous belt of the drag wheel device to feed the material through the transmission device.

Description

Technical Field

[0001] The invention relates to the technical field of clothing processing equipment, in particular to a clip embedding machine with an auxiliary feeding device for overlapping sewing of clothing. Background Art

[0002] The buried clamp machine is also called a curved wrist machine, a three-needle chain stitch machine, a three-needle coiled seam machine or an arm-type double-thread ring sewing machine, etc. The buried clamp usually refers to a process, which is used to sew the side bones of the top or the outer bones of the bottom. The special cantilevered cylindrical structure of the buried clamp machine is particularly suitable for overlapping sewing of cylindrical parts such as sleeves and pants. The buried clamp machine is already a relatively mature technology. The existing buried clamp machine usually includes a sewing machine head, a pull cylinder (used to splice and curl two pieces of cloth), a thread cutting mechanism (used to cut the thread on the sewn cloth), a presser foot assembly (used to cooperate with the feed dog of the sewing machine to feed) and an auxiliary feeding device. The stability of the auxiliary feeding device will affect the quality of sewing. Therefore, various equipment manufacturers are designing different auxiliary feeding devices to ensure continuous and stable feeding process, thereby improving sewing quality.

[0003] The Chinese patent document (patent application number: 201420137880.2) discloses "an auxiliary feeding mechanism of a curved wrist machine", which includes a feeding wheel assembly, a needle plate, a feeding tooth assembly, and a presser foot assembly. The feeding tooth assembly is arranged on a feeding rod; the needle plate covers the feeding tooth assembly, and the feeding teeth of the feeding tooth assembly extend upward from the opening of the needle plate. The feeding teeth are driven by a pulley, and there is no interference between the feeding teeth and the needle plate; the needle plate is fixedly connected to the casing; a presser foot assembly is movably arranged above the needle plate; the presser foot assembly and the presser foot assembly are connected to the presser foot assembly. The foot rod is fixedly connected, and the pinhole groove on the presser foot plate of the presser foot assembly does not interfere with the machine needle; the presser foot rod is driven by the handle, so that the presser foot assembly can move up and down relative to the needle plate; a feed wheel assembly is arranged on the upper side of the needle plate; the wheel bracket of the feed wheel assembly is fixedly connected to the longitudinally arranged adjustment shaft, and the feed wheel of the feed wheel assembly is obliquely against one end of the needle plate; the feed wheel assembly includes a wheel bracket, and the top of the wheel bracket is fixedly connected to the adjustment shaft; the wheel bracket is connected to the feed wheel through its oblique part; the feed wheel and the top connection end of the wheel bracket form a lateral spacing. This patent can reduce the spacing between the feed wheel and the presser foot and the feed teeth, so that the feed of the feed teeth and the feed of the feed wheel have a good connection, making it easy to climb slopes, sew over joints, and sew around turns. This structure has the problem of a small contact area with the fabric, and the feeding process is prone to slippage or jamming, affecting the sewing quality. Summary of the invention

[0004] The object of the present invention is to provide a clip embedding machine with a simple structure and an auxiliary feeding device which is beneficial to improving the sewing quality.

[0005] The basic technical solution for achieving the object of the present invention is: A blind stitch sewing machine with an auxiliary feeding device, which includes a workbench, a sewing head, a draw-off device, a thread cutting mechanism, and a presser foot assembly. The workbench includes a machine frame and a mounting table board. The mounting table board is horizontally and fixedly arranged on the upper end of the rear part of the machine frame. The sewing head is fixedly arranged on the mounting table board, and its front cantilever extends forward out of the mounting table board. The needle plate is fixedly arranged on the left part of the cantilever, below the sewing needle. The draw-off device is fixedly arranged on the cantilever of the sewing head, on the right side of the sewing needle, and is used for joining and hemming two pieces of fabric. The thread cutting mechanism is arranged on the left end of the cantilever of the sewing head, on the left side of the sewing needle, and is used for cutting the thread on the sewn fabric. The presser foot assembly is arranged on the front part of the sewing head, above the needle plate of the cantilever, and cooperates with the feed dog in the cantilever for feeding. Its structural feature is: It further includes an auxiliary feeding device. The auxiliary feeding device includes a transmission device and a drag wheel device. The drag wheel device includes a feeding synchronous belt, and the main shaft on the sewing head of the sewing head drives the feeding synchronous belt of the drag wheel device through the transmission device for feeding.

[0006] The technical solution based on the above basic technical solution is: The drag wheel device further includes a driving wheel, a second driven wheel, and a third driven wheel. The feeding synchronous belt is arranged around the driving wheel, the second driven wheel, and the third driven wheel. The driving device drives the driving wheel to rotate, and the second driven wheel and the third driven wheel jointly press the feeding synchronous belt against the fabric, so that the feeding synchronous belt makes surface contact with the fabric for feeding.

[0007] The technical solution based on the above respective technical solutions is: The transmission device includes a transmission box body, a rotating arm, an eccentric bearing seat, a crank, a linkage arm, a transmission sleeve, an output shaft, a rotating arm connecting shaft, a front crank mounting shaft, a rear crank mounting shaft, a front crank connecting rod, a front crank shaft, a rear crank connecting rod, a rear crank shaft, a universal coupling, and a driving shaft.

[0008] A rotating arm hole penetrating inside and outside the box body is provided at the lower right part of the transmission box body. A through hole corresponding to the rotating arm hole is opened on the sewing head. The transmission box body is fixedly arranged on the rear part of the sewing head, and the inside of the transmission box body is connected to the inside of the sewing head through the rotating arm hole and the through hole on the sewing head. The eccentric bearing seat is transmissionally arranged on the main shaft on the sewing head of the sewing head. The eccentric wheel part of the eccentric bearing seat is rotationally arranged on the lower end of the rotating arm through a corresponding bearing. The upper part of the rotating arm extends into the transmission box body. The rotating arm connecting shaft is fixedly connected to the upper end of the rotating arm along the front-rear direction from the middle thereof. The front and rear ends of the right end of the linkage arm are rotationally connected to the rotating arm connecting shaft, and the corresponding part of the upper part of the rotating arm is located between the front and rear ends of the right end of the linkage arm. The front and rear ends of the left end of the front crank shaft are hingedly connected to the transmission sleeve.

[0009] The front part of the output shaft is rotatably arranged on the front part of the left side of the transmission case body through a corresponding bearing and extends forward out of the transmission case body. The rear part of the output shaft is rotatably arranged on the rear part of the left side of the transmission case body through a one-way bearing. The transmission sleeve is in transmission connection with the output shaft through a one-way bearing.

[0010] The front crank mounting shaft and the rear crank mounting shaft are respectively rotatably arranged on the front part and the rear part of the right side of the transmission case body, and the rear crank mounting shaft extends backward out of the transmission case body. The crank is in a U shape with an opening vertically to the left. The front and rear sides of the right part of the crank are respectively in transmission and fixed connection with the front crank mounting shaft and the rear crank mounting shaft.

[0011] The front part of the front crank shaft is fixedly arranged on the front end head of the left part of the crank and extends backward. The rear part of the rear crank shaft is fixedly arranged on the rear end head of the left part of the crank and extends forward. The right end of the front crank connecting rod is rotatably connected to the front end of the rotating arm connecting shaft. The left end of the front crank connecting rod is rotatably connected to the rear end of the front crank shaft. The right end of the rear crank connecting rod is rotatably connected to the rear end of the rotating arm connecting shaft. The right end of the rear crank connecting rod is rotatably connected to the front end of the rear crank shaft. The output shaft is in transmission connection with the driving shaft through a universal coupling.

[0012] The technical solution based on the above respective corresponding technical solutions is that the idler wheel device further includes a swing arm assembly. The second driven wheel and the third driven wheel are lifted or pressed down through the swing arm assembly.

[0013] The technical solution based on the above respective corresponding technical solutions is that the idler wheel device further includes a mounting seat assembly, a driven wheel mounting seat and a first driven wheel. The driving device includes a driving shaft. The mounting seat assembly includes a connecting seat, a mounting seat and a front cover plate. The connecting seat is fixedly connected to the upper part of the front left side of the sewing machine head from its right part and extends leftward. The upper part of the mounting seat is hinged to the left part of the connecting seat. The front cover plate is fixedly arranged on the front side of the mounting seat. The driving shaft of the driving device is rotatably arranged on the upper part of the front cover plate and the upper part of the mounting seat through corresponding bearings, and its rotation axis is horizontally arranged along the front-rear direction. The driving wheel is coaxially arranged on the driving shaft and is located between the front cover plate and the mounting seat. The first driven wheel is rotatably arranged between the lower rear side of the front cover plate and the lower front side of the mounting seat.

[0014] The driven wheel mounting seat includes a front side driven wheel mounting plate and a rear side driven wheel mounting plate. The front left part of the front side driven wheel mounting plate is provided with a front limit pin. The rear left part of the rear side driven wheel mounting plate is provided with a rear limit pin. The front side driven wheel mounting plate and the rear side driven wheel mounting plate are fixedly connected.

[0015] The second driven wheel is rotatably arranged between the rear right part of the front side driven wheel mounting plate and the front right part of the rear side driven wheel mounting plate.

[0016] The third driven wheel is rotatably arranged between the rear left part of the front side driven wheel mounting plate and the front left part of the rear side driven wheel mounting plate.

[0017] The swing arm assembly includes a front connecting arm, a front adjusting arm, a rear connecting arm, a rear adjusting arm, a swing arm driving cylinder and a swing arm driving frame. The front connecting arm is rotatably arranged on the lower part of the front cover plate by its left part and is coaxially arranged with the first driven wheel. The rear connecting arm is rotatably arranged on the lower part of the mounting seat by its left part and is coaxially arranged with the first driven wheel. The front adjusting arm is fixedly arranged on the right part of the front connecting arm. The rear adjusting arm is fixedly arranged on the right part of the rear connecting arm.

[0018] The driven wheel mounting seat is rotatably arranged between the rear side of the right end of the front adjusting arm and the front side of the right end of the rear adjusting arm. The front side driven wheel mounting plate is rotatably arranged on the rear side of the right end of the front adjusting arm by its middle part on the front side, and the rear side driven wheel mounting plate is rotatably arranged on the front side of the right end of the front adjusting arm by its middle part on the rear side. The rotation axes of the second driven wheel and the third driven wheel are respectively located on the right side and the left side of the driven wheel mounting seat.

[0019] The right end of the front adjusting arm is provided with a front adjusting hole penetrating through its front and rear. The front adjusting hole is an arc-shaped waist-shaped hole, and its center is located on the rotation axis of the driven wheel mounting seat. The front limiting pin on the front side driven wheel mounting plate is slidably arranged in the front adjusting hole.

[0020] The right end of the rear adjusting arm is provided with a rear adjusting hole penetrating through its front and rear. The rear adjusting hole is an arc-shaped waist-shaped hole, and its center is located on the rotation axis of the driven wheel mounting seat. The rear limiting pin on the rear side driven wheel mounting plate is slidably arranged in the rear adjusting hole.

[0021] The feeding synchronous belt is arranged around the driving wheel, the first driven wheel, the second driven wheel and the third driven wheel.

[0022] The swing arm driving cylinder is hinged to the upper right side of the mounting seat by the upper end of its cylinder body, and its piston rod extends downward. The swing arm driving frame is fixedly arranged at the lower end of the piston rod of the swing arm driving cylinder. The lower part of the swing arm driving frame is hinged to the front adjusting arm and the rear adjusting arm, so that the front adjusting arm and the rear adjusting arm are driven by the swing arm driving cylinder through the swing arm driving frame to be lifted synchronously or pressed down synchronously.

[0023] The technical solution based on the above respective technical solutions is that the auxiliary feeding mechanism further includes a tensioning device, and the tensioning device is used to keep the feeding synchronous belt in a tensioned state.

[0024] The technical solution based on the above respective technical solutions is as follows: The tensioning device of the auxiliary feeding mechanism includes a pressing wheel, a pressing swing arm, a tension spring seat, a tension spring and a swing arm mounting plate. The swing arm mounting plate is fixedly arranged on the mounting seat assembly of the idler wheel device. The pressing swing arm is rotatably arranged between the swing arm mounting plate and the mounting seat assembly in the middle thereof. The pressing swing arm is provided with a tension spring connecting plate which extends backward out of the swing arm mounting plate. The tension spring seat is fixedly arranged on the rear side of the mounting seat and above the swing arm mounting plate. The tension spring seat is provided with a waist-shaped hole penetrating through the front and rear in the left-right direction, and a tension spring pin shaft is arranged in the waist-shaped hole of the tension spring seat. A pin shaft adjusting screw is arranged on the tension spring seat. The tension spring pin shaft passes through the corresponding part of the tension spring seat and then extends into the waist-shaped hole and is screwed into the threaded hole on the tension spring pin shaft, so as to adjust the position of the tension spring pin shaft in the left-right direction. The tension spring is arranged between the tension spring connecting plate of the pressing swing arm and the tension spring pin shaft and is in a stretched state. The pressing wheel is rotatably arranged on the front side of the lower end of the pressing swing arm and presses the outer side of the feeding synchronous belt from top to bottom, so that the feeding synchronous belt is always kept in a tensioned state.

[0025] The present invention has the following beneficial effects: (1) The blind hemmer with an auxiliary feeding device of the present invention transports the fabric smoothly through the auxiliary feeding device, which is beneficial to improving the sewing quality, and the stitches are uniform and neat after sewing. The power source of the auxiliary feeding device is from the sewing machine head, which is not only energy-saving but also has good synchronism, ensuring the synchronism of sewing and dragging the material, and further improving the sewing quality.

[0026] (2) The auxiliary feeding device of the blind hemmer of the present invention is provided with an adjusting device. By changing the height of the locking position at the right end of the adjusting arm, the height of the two ends at the left end of the crank is changed, so as to change the height positions of the front crankshaft and the rear crankshaft, and finally realize the adjustment of the rotation speed of the output shaft, adapt to the feeding requirements of different elastic fabrics, ensure the unity of the sewing stitch, and be beneficial to improving the sewing quality.

[0027] (3) The auxiliary feeding device of the blind hemmer of the present invention is provided with a second driven wheel and a third driven wheel. The feeding synchronous belt is pressed on the fabric through the second driven wheel and the third driven wheel, greatly increasing the contact area between the feeding synchronous belt and the fabric, and the feeding is stable.

[0028] (4) The auxiliary feeding device of the blind hemmer of the present invention is provided with a tensioning device, which can adjust the tension degree, ensure that the feeding synchronous belt is always kept in a good tensioned state, prevent loosening and slipping, and further improve the reliability of feeding. At the same time, the tensioning device adopts the way of pressing from top to bottom, which can reduce the height of the right-end feeding synchronous belt, make the feeding synchronous belt surround the second driven wheel in a larger area. On the one hand, the transmission is reliable and the slipping is prevented. On the other hand, it is beneficial for the second driven wheel to be closer to the sewing needle, facilitating turning sewing. Description of the Drawings

[0029] Figure 1Schematic structural diagram of an overlock sewing machine with an auxiliary feeding device according to the present invention.

[0030] Figure 2 It is Figure 1 left side view schematic diagram.

[0031] Figure 3 It is Figure 1 right side view schematic diagram.

[0032] Figure 4 It is Figure 1 top view schematic diagram.

[0033] Figure 5 It is a schematic diagram when observing from the Figure 1 upper right front of

[0034] Figure 6 It is a schematic diagram when observing from the Figure 1 upper left front of

[0035] Figure 7 It is a schematic diagram when observing from the Figure 1 upper side of

[0036] Figure 8 It is a schematic diagram when observing from the Figure 1 upper left rear of

[0037] Figure 9 It is a schematic diagram when observing from the Figure 1 lower right front of

[0038] Figure 10 It is a schematic diagram when observing from the Figure 1 lower left rear of

[0039] Figure 11 It is a schematic diagram when observing from the Figure 1 lower right front of

[0040] Figure 12 Schematic structural diagram of the adjusting arm of the adjusting device.

[0041] Figure 13 It is a schematic diagram when observing from the Figure 1 upper side of

[0042] Figure 14 It is a schematic diagram when observing from the Figure 1 rear of

[0043] Figure 15 The enlarged structural schematic diagram of the upper towing wheel device observed from the upper right rear of Figure 1 .

[0044] Figure 16 The enlarged structural schematic diagram of the upper towing wheel device observed from the lower left rear of Figure 1 .

[0045] Figure 17 The enlarged structural schematic diagram of the mounting seat of the mounting seat assembly of the towing wheel device observed from the upper right rear of Figure 1 .

[0046] Figure 18 The enlarged structural schematic diagram of the tensioning device observed from the upper left front of Figure 1 .

[0047] Figure 19 The enlarged structural schematic diagram of the second driven wheel, the third driven wheel and the driven wheel mounting seat of the towing wheel device observed from the upper right front of Figure 1 .

[0048] The reference numerals in the drawings are:

[0049] Workbench 1, frame 1-1, mounting table board 1-2,

[0050] Sewing machine head 2, cantilever 2-1, needle plate 2-2,

[0051] Pulling cylinder 3,

[0052] Thread trimming mechanism 4,

[0053] Presser foot assembly 5,

[0054] Auxiliary feeding device 6,

[0055] Transmission device 6a, transmission box body 6a-1, rotating arm 6a-2, eccentric bearing seat 6a-3, crank 6a-4, linkage arm 6a-5, transmission sleeve 6a-6, output shaft 6a-7, rotating arm connecting shaft 6a-8, front crank mounting shaft 6a-9, rear crank mounting shaft 6a-10, front crank connecting rod 6a-11, front crankshaft 6a-12, rear crank connecting rod 6a-13, rear crankshaft 6a-14, universal coupling 6a-15, drive shaft 6a-16,

[0056] Towing wheel device 6b,

[0057] Mounting seat assembly 6b-1, connecting seat 6b-1-1, mounting seat 6b-1-2, front cover plate 6b-1-3,

[0058] Drive wheel 6b-2,

[0059] Driven wheel mounting seat 6b-3, front side driven wheel mounting plate 6b-31, front limit pin 6b-311, rear side driven wheel mounting plate 6b-32, rear limit pin 6b-321

[0060] First driven wheel 6b-4, second driven wheel 6b-5, third driven wheel 6b-6, feeding synchronous belt 6b-7

[0061] Swing arm assembly 6b-8, front connecting arm 6b-81

[0062] Front adjusting arm 6b-82, front adjusting hole 6b-821

[0063] Rear connecting arm 6b-83

[0064] Rear adjusting arm 6b-84, rear adjusting hole 6b-841

[0065] Swing arm driving cylinder 6b-85, swing arm driving frame 6b-86

[0066] Tensioning device 6c, pressing wheel 6c-1, pressing swing arm 6c-2, tension spring connecting plate 6c-21, tension spring seat 6c-3, waist-shaped hole 6c-31, tension spring 6c-4, swing arm mounting plate 6c-5, tension spring pin 6c-6, pin adjusting screw 6c-7 Detailed implementation mode

[0067] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to specific embodiments in conjunction with the drawings. The description of the orientation of the present invention is carried out according to Figure 1 the orientation shown, that is Figure 1 the up, down, left and right directions shown are the up, down, left and right directions described, Figure 1 the direction facing is the front, and the direction deviating from Figure 1 is the rear.

[0068] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0069] It should be understood that the terms "up", "down", "inside", "outside", etc. indicating the orientation or position relationship are based on the position relationship shown in the drawings, and are only for the convenience of describing the present invention or simplifying the description, rather than indicating a specific orientation that must be possessed.

[0070] (Embodiment 1)

[0071] See Figures 1 to 19, the bartacking machine with an auxiliary feeding device of the present invention includes a workbench 1, a sewing head 2, a pulling cylinder 3, a thread cutting mechanism 4, a presser foot assembly 5 and an auxiliary feeding device 6.

[0072] See Figures 1 to 6 , the workbench 1 includes a frame 1-1 and a mounting table board 1-2. The mounting table board 1-2 is horizontally and fixedly arranged on the upper end of the rear part of the frame 1-1. The sewing head 2 is fixedly arranged on the mounting table board 1-2, and its front cantilever 2-1 extends forward outside the mounting table board 1-2. The needle plate 2-2 is fixedly arranged on the left part of the cantilever 2-1, below the sewing needle. The pulling cylinder 3 is fixedly arranged on the cantilever 2-1 of the sewing head 2, on the right side of the sewing needle, that is, on the feeding side of the sewing needle before sewing in the fabric feeding direction. The pulling cylinder 3 is used to join and hem two pieces of fabric. The thread cutting mechanism 4 is arranged on the left end of the cantilever 2-1 of the sewing head 2, on the left side of the sewing needle, that is, on the discharging side of the sewing needle after sewing in the fabric feeding direction, and is used to cut the thread on the sewn fabric. The presser foot assembly 5 is arranged on the front part of the sewing head 2, above the needle plate 2-2 of the cantilever 2-1, and cooperates with the feed dog in the cantilever 2-1 to feed the material.

[0073] See Figures 1 to 19 , the auxiliary feeding device 6 includes a transmission device 6a, a drag wheel device 6b, a tensioning device 6c and an adjusting device 6d.

[0074] See Figures 7 to 12 , the transmission device 6a includes a transmission box body 6a-1, a rotating arm 6a-2, an eccentric bearing seat 6a-3, a crank 6a-4, a linkage arm 6a-5, a transmission sleeve 6a-6, an output shaft 6a-7, a rotating arm connecting shaft 6a-8, a front crank mounting shaft 6a-9, a rear crank mounting shaft 6a-10, a front crank connecting rod 6a-11, a front crank shaft 6a-12, a rear crank connecting rod 6a-13, a rear crank shaft 6a-14, a universal coupling 6a-15 and a driving shaft 6a-16.

[0075] On the lower right part of the transmission box body 6a-1, there is a rotary arm hole 6a-1-1 penetrating through the inside and outside of the box body. A through hole corresponding to the rotary arm hole 6a-1-1 is opened on the sewing head 2. The transmission box body 6a-1 is fixedly arranged on the rear part of the sewing head 2, and the inside of the transmission box body 6a-1 is communicated with the inside of the sewing head 2 through the rotary arm hole 6a-1-1 and the through hole on the sewing head 2. The eccentric bearing seat 6a-3 is drivably arranged on the main spindle of the sewing head of the sewing head 2. The eccentric wheel part of the eccentric bearing seat 6a-3 is rotatably arranged on the lower end of the rotary arm 6a-2 through a corresponding bearing. The upper part of the rotary arm 6a-2 extends into the transmission box body 6a-1. The rotary arm connecting shaft 6a-8 is fixedly connected to the upper end of the rotary arm 6a-2 along the front-rear direction from the middle thereof. The front and rear ends of the right end of the linkage arm 6a-5 are rotatably connected to the rotary arm connecting shaft 6a-8, and the corresponding part of the upper part of the rotary arm 6a-2 is located between the front and rear ends of the right end of the linkage arm 6a-5. The front and rear ends of the left end of the front crankshaft 6a-12 are hingedly connected to the transmission sleeve 6a-6.

[0076] The front part of the output shaft 6a-7 is rotatably arranged on the front part of the left part of the transmission box body 6a-1 through a corresponding bearing and extends out of the transmission box body 6a-1 forward. The rear part of the output shaft 6a-7 is rotatably arranged on the rear part of the left part of the transmission box body 6a-1 through a one-way bearing. The transmission sleeve 6a-6 is drivably connected to the output shaft 6a-7 through a one-way bearing.

[0077] The front crank mounting shaft 6a-9 and the rear crank mounting shaft 6a-10 are respectively rotatably arranged on the front part of the right part and the rear part of the right part of the transmission box body 6a-1, and the rear crank mounting shaft 6a-10 extends out of the transmission box body 6a-1 backward. The crank 6a-4 is in a U shape with the opening vertically to the left. The front and rear sides of the right part of the crank 6a-4 are respectively drivably and fixedly connected to the front crank mounting shaft 6a-9 and the rear crank mounting shaft 6a-10.

[0078] The front part of the front crankshaft 6a-12 is fixedly arranged on the front end of the left part of the crank 6a-4 and extends backward. The rear part of the rear crankshaft 6a-14 is fixedly arranged on the rear end of the left part of the crank 6a-4 and extends forward.

[0079] The right end of the front crank connecting rod 6a-11 is rotatably connected to the front end of the rotary arm connecting shaft 6a-8. The left end of the front crank connecting rod 6a-11 is rotatably connected to the rear end of the front crankshaft 6a-12.

[0080] The right end of the rear crank connecting rod 6a-13 is rotatably connected to the rear end of the rotary arm connecting shaft 6a-8. The right end of the rear crank connecting rod 6a-13 is rotatably connected to the front end of the rear crankshaft 6a-14.

[0081] The output shaft 6a-7 is drivably connected to the drive shaft 6a-16 through a universal coupling 6a-15.

[0082] See Figures 14 to 19 , the tug device 6b includes a mounting seat assembly 6b-1, a driving wheel 6b-2, a driven wheel mounting seat 6b-3, a first driven wheel 6b-4, a second driven wheel 6b-5, a third driven wheel 6b-6, a feeding synchronous belt 6b-7 and a swing arm assembly 6b-8.

[0083] The mounting seat assembly 6b-1 includes a connecting seat 6b-1-1, a mounting seat 6b-1-2 and a front cover plate 6b-1-3. The connecting seat 6b-1-1 is fixedly connected to the upper front left side of the sewing machine head 2 at its right part and extends leftward. The upper part of the mounting seat 6b-1-2 is hingedly connected to the left part of the connecting seat 6b-1-1. The front cover plate 6b-1-3 is fixedly arranged on the front side of the mounting seat 6b-1-2. The driving shaft 6a-16 of the transmission device 6a is rotatably arranged on the upper part of the front cover plate 6b-1-3 and the upper part of the mounting seat 6b-1-2 through corresponding bearings, and its rotation axis is horizontally arranged in the front-rear direction. The driving wheel 6b-2 is coaxially driven on the driving shaft 6a-16 and is located between the front cover plate 6b-1-3 and the mounting seat 6b-1-2. The first driven wheel 6b-4 is rotatably arranged between the lower rear side of the front cover plate 6b-1-3 and the lower front side of the mounting seat 6b-1-2.

[0084] The driven wheel mounting seat 6b-3 includes a front side driven wheel mounting plate 6b-31 and a rear side driven wheel mounting plate 6b-32. A front limit pin 6b-311 is provided at the left part of the front side of the front side driven wheel mounting plate 6b-31. A rear limit pin 6b-321 is provided at the left part of the rear side of the rear side driven wheel mounting plate 6b-32. The front side driven wheel mounting plate 6b-31 and the rear side driven wheel mounting plate 6b-32 are fixedly connected.

[0085] The second driven wheel 6b-5 is rotatably arranged between the right rear part of the front side driven wheel mounting plate 6b-31 and the right front part of the rear side driven wheel mounting plate 6b-32.

[0086] The third driven wheel 6b-6 is rotatably arranged between the left rear part of the front side driven wheel mounting plate 6b-31 and the left front part of the rear side driven wheel mounting plate 6b-32.

[0087] The swing arm assembly 6b-8 includes a front connecting arm 6b-81, a front adjusting arm 6b-82, a rear connecting arm 6b-83, a rear adjusting arm 6b-84, a swing arm driving cylinder 6b-85 and a swing arm driving bracket 6b-86. The front connecting arm 6b-81 is rotatably arranged on the lower part of the front cover plate 6b-1-3 by its left part and is coaxially arranged with the first driven wheel 6b-4. The rear connecting arm 6b-83 is rotatably arranged on the lower part of the mounting seat 6b-1-2 by its left part and is coaxially arranged with the first driven wheel 6b-4. The front adjusting arm 6b-82 is fixedly arranged on the right part of the front connecting arm 6b-81. The rear adjusting arm 6b-84 is fixedly arranged on the right part of the rear connecting arm 6b-83.

[0088] The driven wheel mounting seat 6b-3 is rotatably arranged between the rear side of the right end of the front adjusting arm 6b-82 and the front side of the right end of the rear adjusting arm 6b-84; the front side driven wheel mounting plate 6b-31 is rotatably arranged on the rear side of the right end of the front adjusting arm 6b-82 by its middle part on the front side, the rear side driven wheel mounting plate 6b-32 is rotatably arranged on the front side of the right end of the front adjusting arm 6b-82 by its middle part on the rear side, and the rotation axes of the second driven wheel 6b-5 and the third driven wheel 6b-6 are respectively located on the right side and the left side of the driven wheel mounting seat 6b-3.

[0089] The front adjusting arm 6b-82 is provided with a front adjusting hole 6b-821 penetrating through its front and rear. The front adjusting hole 6b-821 is an arc-shaped waist-shaped hole, and its center is located on the rotation axis of the driven wheel mounting seat 6b-3. The front limit pin 6b-311 on the front side driven wheel mounting plate 6b-31 is slidably arranged in the front adjusting hole 6b-821.

[0090] The rear adjusting arm 6b-84 is provided with a rear adjusting hole 6b-841 penetrating through its front and rear. The rear adjusting hole 6b-841 is an arc-shaped waist-shaped hole, and its center is located on the rotation axis of the driven wheel mounting seat 6b-3. The rear limit pin 6b-321 on the rear side driven wheel mounting plate 6b-32 is slidably arranged in the rear adjusting hole 6b-841.

[0091] The feeding synchronous belt 6b-7 is arranged around the driving wheel 6b-2, the first driven wheel 6b-4, the second driven wheel 6b-5 and the third driven wheel 6b-6.

[0092] The swing arm driving cylinder 6b-85 is hinged and connected to the upper right part of the mounting seat 6b-1-2 by the upper end of its cylinder body, and its piston rod extends downward. The swing arm driving bracket 6b-86 is fixedly arranged at the lower end of the piston rod of the swing arm driving cylinder 6b-85. The lower part of the swing arm driving bracket 6b-86 is hinged and connected to the front adjusting arm 6b-82 and the rear adjusting arm 6b-84, so that the front adjusting arm 6b-82 and the rear adjusting arm 6b-84 are driven by the swing arm driving cylinder 6b-85 through the swing arm driving bracket 6b-86 to be lifted synchronously or pressed down synchronously.

[0093] See Figure 18 , the tensioning device 6c includes a pressing wheel 6c-1, a pressing swing arm 6c-2, a tension spring seat 6c-3, a tension spring 6c-4, and a swing arm mounting plate 6c-5.

[0094] The swing arm mounting plate 6c-5 is fixedly arranged on the rear part of the mounting seat 6b-1-2 and is located between the driving wheel 6b-2 and the first driven wheel 6b-4 in the up-down direction. The pressing swing arm 6c-2 is rotatably arranged between the swing arm mounting plate 6c-5 and the mounting seat 6b-1-2 by its middle part. The pressing swing arm 6c-2 is provided with a tension spring connecting plate 6c-21, and the tension spring connecting plate 6c-21 extends backward out of the swing arm mounting plate 6c-5. The tension spring seat 6c-3 is fixedly arranged on the rear side of the mounting seat 6b-1-2 and is located above the swing arm mounting plate 6c-5. The tension spring seat 6c-3 is provided with a waist-shaped hole 6c-31 penetrating through its front and rear in the left-right direction, and a tension spring pin shaft 6c-6 is arranged in the waist-shaped hole 6c-31 of the tension spring seat 6c-3. A pin shaft adjusting screw 6c-7 is arranged on the tension spring seat 6c-3. The tension spring pin shaft 6c-6 is provided with a screw hole penetrating through its left and right and cooperating with the pin shaft adjusting screw 6c-7. The screw rod of the pin shaft adjusting screw 6c-7 passes backward through the corresponding part of the tension spring seat 6c-3 and then extends into the waist-shaped hole 6c-31 and is screwed into the screw hole on the tension spring pin shaft 6c-6, so as to adjust the position of the tension spring pin shaft 6c-6 in the left-right direction. The tension spring 6c-4 is arranged between the tension spring connecting plate 6c-21 of the pressing swing arm 6c-2 and the tension spring pin shaft 6c-6 and is in a stretched state. The pressing wheel 6c-1 is rotatably arranged on the front side of the lower end of the pressing swing arm 6c-2 and presses the feeding synchronous belt 6b-7 from top to bottom, so that the feeding synchronous belt 6b-7 is always kept in a tensioned state.

[0095] See Figures 7 to 13 , the adjusting device 6d includes an adjusting arm mounting seat 6d-1, an adjusting arm 6d-2, a locking bolt 6d-3, and a locking handwheel 6d-4.

[0096] The adjusting arm mounting seat 6d-1 is fixedly arranged on the right side of the transmission box body 6a-1. A first adjusting groove 6d-1-1 in the shape of an ellipse penetrating through its front and rear is arranged on the right part of the adjusting arm mounting seat 6d-1 in the up-down direction.

[0097] A second adjusting groove 6d-2-1 in the shape of an ellipse penetrating through its front and rear is arranged on the right part of the adjusting arm 6d-2 along its length direction. The second adjusting groove 6d-2-1 intersects with the first adjusting groove 6d-1-1 of the adjusting arm mounting seat 6d-1. The left end of the adjusting arm 6d-2 is fixedly connected to the rear end of the crank rear mounting shaft 6a-10.

[0098] The screw rod of the locking bolt 6d-3 passes through the second adjustment slot 6d-2-1 of the adjustment arm 6d-2 and the first adjustment slot 6d-1-1 of the adjustment arm mounting seat 6d-1 from the rear to the front in sequence and then is screwed onto the locking handwheel 6d-4, thereby fixedly connecting the adjustment arm 6d-2 and the adjustment arm mounting seat 6d-1. By changing the vertical position of the locking bolt 6d-3 in the first adjustment slot 6d-1-1 of the adjustment arm mounting seat 6d-1, the height adjustment of the two end heads at the left part of the crank 6a-4 is realized, thereby changing the height positions of the front crankshaft 6a-12 and the rear crankshaft 6a-14.

[0099] Corresponding gaskets are provided on the locking bolt 6d-3 between the rear end head of the locking bolt 6d-3 and the adjustment arm 6d-2, between the adjustment arm 6d-2 and the adjustment arm mounting seat 6d-1, and between the adjustment arm mounting seat 6d-1 and the locking handwheel 6d-4.

[0100] When the auxiliary feeding device of the bartack sewing machine with an auxiliary feeding device of the present invention works: the upper main shaft of the sewing machine head 2 drives the eccentric bearing seat 6a-3 to rotate, the eccentric wheel part of the eccentric bearing seat 6a-3 drives the rotating arm 6a-2 to move, thereby driving the transmission sleeve 6a-6 to reciprocate through the linkage arm 6a-5. Since the rear part of the output shaft 6a-7 is rotatably arranged on the rear part of the left part of the transmission box body 6a-1 through a one-way bearing; the transmission sleeve 6a-6 is in transmission connection with the output shaft 6a-7 through a one-way bearing, thereby driving the output shaft 6a-7 to rotate in one direction by the transmission sleeve 6a-6, and further driving the driving wheel 6b-2 to rotate through the universal coupling 6a-15 and the driving shaft 6a-16, so as to realize the feeding of the feeding synchronous belt 6b-7. The piston rod of the swing arm driving cylinder 6b-85 extends downward, and drives the right ends of the front adjustment arm 6b-82 and the rear adjustment arm 6b-84 to press down synchronously through the swing arm driving frame 6b-86, thereby lowering the driven wheel mounting seat 6b-3. When the second driven wheel 6b-5 presses the corresponding part of the feeding synchronous belt 6b-7 downward from above on the sewn good fabric, the fabric is pressed on the needle plate 2-2. The front adjustment arm 6b-82 and the rear adjustment arm 6b-84 continue to move downward, and press the front limit pin 6b-311 and the rear limit pin 6b-321 downward through the front adjustment hole 6b-821 and the rear adjustment hole 6b-841, thereby enabling the third driven wheel 6b-6 to continue to press the corresponding part of the feeding synchronous belt 6b-7 downward from above on the sewn good fabric, thereby greatly increasing the pressing contact area between the feeding synchronous belt 6b-7 and the fabric, ensuring stable feeding, and improving the sewing quality.

[0101] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An overlock sewing machine with an auxiliary feeding device, comprising a workbench, a sewing head, a pulling cylinder, a thread cutting mechanism and a presser foot assembly; the workbench comprises a machine frame and a mounting table board; the mounting table board is horizontally and fixedly arranged on the upper end of the rear part of the machine frame; the sewing head is fixedly arranged on the mounting table board, and the front part of the sewing head extends forward out of the mounting table board in a cantilever manner, and a needle plate is fixedly arranged on the left part of the cantilever, below the sewing needle; the pulling cylinder is fixedly arranged on the cantilever of the sewing head, on the right side of the sewing needle, and is used for splicing and hemming two pieces of fabric; the thread cutting mechanism is arranged on the left end of the cantilever of the sewing head, on the left side of the sewing needle, and is used for cutting the thread on the sewn fabric; the presser foot assembly is arranged on the front part of the sewing head, above the needle plate of the cantilever, and cooperates with the feed dog in the cantilever to feed the material. It is characterized in that: It further comprises an auxiliary feeding device; the auxiliary feeding device comprises a transmission device, a drag wheel device and a tensioning device; the transmission device comprises a rotating arm, an eccentric bearing seat, a linkage arm, a transmission sleeve, an output shaft, a universal coupling and a driving shaft; the drag wheel device comprises a driving wheel, a second driven wheel, a third driven wheel, a feeding synchronous belt and a swing arm assembly, and the feeding synchronous belt is arranged around the driving wheel, the second driven wheel and the third driven wheel; the eccentric bearing seat is driven to rotate by the upper main shaft of the sewing head of the sewing machine head, and the rotating arm is driven to move by the eccentric wheel part of the eccentric bearing seat, so that the transmission sleeve is driven to reciprocate through the linkage arm. Since the rear part of the output shaft is rotatably arranged on the rear part of the left side of the transmission box body through a one-way bearing; the transmission sleeve is in transmission connection with the output shaft through a one-way bearing, so that the output shaft is driven to rotate in one direction by the transmission sleeve, and then the driving wheel is driven to rotate through the universal coupling and the driving shaft; the second driven wheel and the third driven wheel jointly press the feeding synchronous belt on the fabric, so that the feeding synchronous belt is in surface contact with the fabric for feeding; the second driven wheel and the third driven wheel are lifted or pressed down through the swing arm assembly; the tensioning device is used for keeping the feeding synchronous belt in a tensioned state.

2. The overlock sewing machine with an auxiliary feeding device according to claim 1, It is characterized in that: The transmission device further comprises a transmission box body, a crank, a rotating arm connecting shaft, a front crank mounting shaft, a rear crank mounting shaft, a front crank connecting rod, a front crank shaft, a rear crank connecting rod and a rear crank shaft; A rotating arm hole penetrating through the inside and outside of the box body is arranged on the lower right part of the transmission box body; a through hole corresponding to the rotating arm hole is opened on the sewing machine head; the transmission box body is fixedly arranged on the rear part of the sewing machine head, and the inside of the transmission box body is communicated with the inside of the sewing machine head through the rotating arm hole and the through hole on the sewing machine head; the eccentric bearing seat is in transmission arrangement on the upper main shaft of the sewing machine head of the sewing machine head; the eccentric wheel part of the eccentric bearing seat is rotatably arranged on the lower end of the rotating arm through a corresponding bearing; the upper part of the rotating arm extends into the transmission box body; the rotating arm connecting shaft is fixedly connected to the upper end of the rotating arm along the front-back direction in the middle; the front and rear ends of the right end of the linkage arm are rotationally connected to the rotating arm connecting shaft, and the corresponding part of the upper part of the rotating arm is located between the front and rear ends of the right end of the linkage arm; the front and rear ends of the left end of the front crank shaft are hinged to the transmission sleeve; The front part of the output shaft is rotatably arranged on the front part of the left side of the transmission box body through a corresponding bearing and extends forward out of the transmission box body; the rear part of the output shaft is rotatably arranged on the rear part of the left side of the transmission box body through a one-way bearing; the transmission sleeve is in transmission connection with the output shaft through a one-way bearing; The front crank mounting shaft and the rear crank mounting shaft are respectively rotatably arranged on the front part of the right side and the rear part of the right side of the transmission box body, and the rear crank mounting shaft extends backward out of the transmission box body; the crank is in a U shape with an opening vertically to the left; the front and rear sides of the right part of the crank are respectively fixedly connected in transmission with the front crank mounting shaft and the rear crank mounting shaft; The front part of the front crank shaft is fixedly arranged on the front end head of the left part of the crank and extends backward; the rear part of the rear crank shaft is fixedly arranged on the rear end head of the left part of the crank and extends forward; the right end of the front crank connecting rod is rotatably connected to the front end of the rotating arm connecting shaft; the left end of the front crank connecting rod is rotatably connected to the rear end of the front crank shaft; the right end of the rear crank connecting rod is rotatably connected to the rear end of the rotating arm connecting shaft; the right end of the rear crank connecting rod is rotatably connected to the front end of the rear crank shaft; the output shaft is in transmission connection with the driving shaft through a universal coupling.

3. The overlock sewing machine with an auxiliary feeding device according to claim 2, characterized in that: The idler wheel device further includes a mounting seat assembly, a driven wheel mounting seat and a first driven wheel; the driving device includes a driving shaft; the mounting seat assembly includes a connecting seat, a mounting seat and a front cover plate; the connecting seat is fixedly connected to the upper part of the front left side of the sewing machine head from its right part and extends leftward; the upper part of the mounting seat is hinged to the left part of the connecting seat; the front cover plate is fixedly arranged on the front side of the mounting seat; the driving shaft of the driving device is rotatably arranged on the upper part of the front cover plate and the upper part of the mounting seat through corresponding bearings, and its rotation axis is horizontally arranged in the front-rear direction; the driving wheel is coaxially arranged in transmission on the driving shaft and is located between the front cover plate and the mounting seat; the first driven wheel is rotatably arranged between the lower rear side of the front cover plate and the lower front side of the mounting seat; The driven wheel mounting seat includes a front side driven wheel mounting plate and a rear side driven wheel mounting plate; a front limit pin is arranged on the front left part of the front side driven wheel mounting plate; a rear limit pin is arranged on the rear left part of the rear side driven wheel mounting plate; the front side driven wheel mounting plate and the rear side driven wheel mounting plate are fixedly connected; The second driven wheel is rotatably arranged between the rear right part of the front side driven wheel mounting plate and the front right part of the rear side driven wheel mounting plate; The third driven wheel is rotatably arranged between the rear left part of the front side driven wheel mounting plate and the front left part of the rear side driven wheel mounting plate; The swing arm assembly includes a front connecting arm, a front adjusting arm, a rear connecting arm, a rear adjusting arm, a swing arm driving cylinder and a swing arm driving frame; the left part of the front connecting arm is rotatably arranged on the lower part of the front cover plate and is coaxially arranged with the first driven wheel; the left part of the rear connecting arm is rotatably arranged on the lower part of the mounting seat and is coaxially arranged with the first driven wheel; the front adjusting arm is fixedly arranged on the right part of the front connecting arm; the rear adjusting arm is fixedly arranged on the right part of the rear connecting arm; The driven wheel mounting seat is rotatably arranged between the rear side of the right end of the front adjustment arm and the front side of the right end of the rear adjustment arm; the front-side driven wheel mounting plate is rotatably arranged on the rear side of the right end of the front adjustment arm by its middle part on the front side, and the rear-side driven wheel mounting plate is rotatably arranged on the front side of the right end of the front adjustment arm by its middle part on the rear side. The rotation axes of the second driven wheel and the third driven wheel are respectively located on the right side and the left side of the driven wheel mounting seat. The right end of the front adjustment arm is provided with a front adjustment hole penetrating through its front and rear. The front adjustment hole is an arc-shaped waist-shaped hole, and its center is located on the rotation axis of the driven wheel mounting seat. The front limit pin on the front-side driven wheel mounting plate is slidably arranged in the front adjustment hole. The right end of the rear adjustment arm is provided with a rear adjustment hole penetrating through its front and rear. The rear adjustment hole is an arc-shaped waist-shaped hole, and its center is located on the rotation axis of the driven wheel mounting seat. The rear limit pin on the rear-side driven wheel mounting plate is slidably arranged in the rear adjustment hole. The feeding synchronous belt is arranged around the driving wheel, the first driven wheel, the second driven wheel and the third driven wheel. The swing arm driving cylinder is hinged to the upper right side of the upper part of the mounting seat by the upper end of its cylinder body, and its piston rod extends downward. The swing arm driving frame is fixedly arranged at the lower end of the piston rod of the swing arm driving cylinder. The lower part of the swing arm driving frame is hinged to the front adjustment arm and the rear adjustment arm, so that the front adjustment arm and the rear adjustment arm are driven by the swing arm driving cylinder through the swing arm driving frame to be lifted synchronously or pressed down synchronously.

4. The blind stitch sewing machine according to claim 3, characterized in that: The tensioning device of the auxiliary feeding mechanism includes a pressing wheel, a pressing swing arm, a spring seat, a spring and a swing arm mounting plate; the swing arm mounting plate is fixedly arranged on the mounting seat assembly of the idler wheel device; the pressing swing arm is rotatably arranged between the swing arm mounting plate and the mounting seat assembly by its middle part. The pressing swing arm is provided with a spring connecting plate, and the spring connecting plate extends backward out of the swing arm mounting plate; the spring seat is fixedly arranged on the rear side of the mounting seat, above the swing arm mounting plate; the spring seat is provided with a waist-shaped hole penetrating through its front and rear in the left-right direction, and a spring pin shaft is arranged in the waist-shaped hole of the spring seat; a pin shaft adjusting screw is arranged on the spring seat; the spring pin shaft passes through the corresponding part of the spring seat and then extends into the waist-shaped hole and is screwed into the screw hole on the spring pin shaft, so as to adjust the position of the spring pin shaft in the left-right direction; the spring is arranged between the spring connecting plate of the pressing swing arm and the spring pin shaft and is in a stretched state; the pressing wheel is rotatably arranged on the front side of the lower end of the pressing swing arm and presses the outer side of the feeding synchronous belt from top to bottom, so that the feeding synchronous belt is always kept in a tensioned state.

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