A multi-needle bar driven embroidery machine head and embroidery machine

Abstract

The present invention discloses a multi-needle bar driven embroidery machine head and an embroidery machine, belonging to the technical field of embroidery machines. The embroidery machine head comprises a housing, a needle bar driving shaft, a guide rod, a needle bar driver, a needle bar cam and a connecting rod structure. The guide rod and the needle bar driver are both provided with 2N numbers at intervals in the horizontal direction, N is a positive integer and a multiple of 2, and the connecting rod structure is provided with N sets in parallel in the horizontal direction, and each set of connecting rod structures is used to drive two corresponding needle bar drivers. Each set of connecting rod structures drives two needle bar drivers, and the connecting rod structures on the same head are arranged side by side in the horizontal direction. The corresponding relationship between the connecting rod structure and the needle bar driver is reasonably set, and the number of connecting rod structures is appropriately controlled while satisfying the driving requirements of the multi-needle bar drivers, reducing the installation space required for the connecting rod structure, which is conducive to reasonably simplifying the internal structure of the head, reserving sufficient installation space for other components of the head, so that the head can meet the structural requirements of the multi-needle bar drive.

Description

Technical Field

[0001] The present invention relates to the technical field of embroidery machines, in particular to a multi-needle bar driven embroidery machine head. In addition, the present invention also relates to an embroidery machine using the head. Background Art

[0002] With the advancement of science and technology, computer embroidery machines have become the main mechanical equipment in the embroidery industry. The head of the embroidery machine is an important structure of the embroidery machine. In order to improve the embroidery efficiency, the head of the embroidery machine is generally equipped with two needle bar drivers spaced in the left and right directions. A set of four-bar linkage structure is set between the needle bar drive shaft on the head and the two needle bar drivers to realize transmission. With the increasing number of heads of lace embroidery machines on the market, the existing four-bar linkage structure between the needle bar drive shaft and the needle bar driver has greatly restricted its development in terms of installation space and cost, which is not conducive to better meeting the working requirements of the embroidery machine. Summary of the invention

[0003] In order to solve the above-mentioned shortcomings and deficiencies in the prior art, the present invention provides a multi-needle bar driven embroidery machine head, which effectively improves the driving efficiency of the head on the needle bars.

[0004] In order to achieve the above technical objectives, the present invention provides a multi-needle bar driven embroidery machine head, including a housing, a needle bar drive shaft, a guide rod, a needle bar driver, a needle bar cam and a connecting rod structure, wherein the needle bar drive shaft can be rotatably placed horizontally on the housing, the guide rod is vertically placed on the housing, the needle bar driver is sleeved on the guide rod, the needle bar cam is sleeved on the needle bar drive shaft, and the connecting rod structure is arranged between the needle bar cam and the needle bar driver and is used to drive the needle bar driver to move up and down. The guide rod and the needle bar driver are both arranged 2N in intervals along the horizontal direction, N is a positive integer and a multiple of 2, and the connecting rod structure is arranged N sets side by side along the horizontal direction, and each set of the connecting rod structure drives two corresponding needle bar drivers.

[0005] Preferably, the connecting rod structure includes a large connecting rod, a needle bar three-eye connecting rod and a small needle bar connecting rod. The large connecting rod is sleeved on the needle bar cam and is transmission connected to the needle bar three-eye connecting rod. The rear end of the needle bar three-eye connecting rod is rotatably connected to the casing, and the two ends of the small needle bar connecting rod are respectively rotatably connected to the needle bar three-eye connecting rod and the needle bar driver.

[0006] Preferably, the casing is provided with a horizontal intermediate shaft, the bottom end of the large connecting rod holds the intermediate shaft, the needle bar three-eye connecting rod is sleeved on the intermediate shaft, and the large connecting rod drives the needle bar three-eye connecting rod to swing up and down through the intermediate shaft.

[0007] Preferably, each set of the connecting rod structure is provided with two small needle bar connecting rods respectively located on both sides of the needle bar three-eye connecting rod, one end of the two small needle bar connecting rods is hinged to the front end of the needle bar three-eye connecting rod, and the other end is hinged to the corresponding needle bar driver.

[0008] Preferably, the needle bar cams are arranged at N / 2 intervals in the transverse direction, and the large connecting rods of the two adjacent sets of connecting rod structures corresponding to the needle bar cams are arranged side by side in the transverse direction on the needle bar cams and are axially limited.

[0009] Preferably, a limiting convex edge is provided on the circumferential outer wall of the needle bar cam, and one axial side of the large connecting rod abuts against the limiting convex edge and is axially limited.

[0010] Preferably, a limit plate is provided on one axial side of the needle bar cam, the outer diameter of the limit plate is larger than the outer diameter of the needle bar cam, and the other axial side of the large connecting rod abuts against the limit plate and is axially limited.

[0011] Preferably, the rear end of the needle bar three-eye connecting rod is hinged to the casing through a locating pin.

[0012] Preferably, four guide rods and needle rod drivers are arranged at equal intervals along the transverse direction, and two sets of connecting rod structures are provided.

[0013] The present invention also provides an embroidery machine, comprising the above-mentioned multi-needle bar driven embroidery machine head.

[0014] After adopting the above technical solution, the present invention has the following advantages:

[0015] 1. The present invention provides a multi-needle bar driven embroidery machine head, the number of connecting rod structures is half of the needle bar drivers, each set of connecting rod structures drives two corresponding needle bar drivers, the connecting rod structures on the same head are arranged side by side in the horizontal direction, the corresponding relationship between the connecting rod structure and the needle bar driver is reasonably set, the number of connecting rod structures is appropriately controlled while meeting the driving requirements of multiple needle bar drivers, reducing the installation space required for the connecting rod structure, which is conducive to reasonably simplifying the internal structure of the head, reserving sufficient installation space for other components of the head, so that the head can meet the structural requirements of multi-needle bar drive.

[0016] 2. The connecting rod structure adopts a structure in which a large connecting rod, a needle bar three-eye connecting rod, an intermediate shaft and a needle bar small connecting rod cooperate. When the needle bar cam rotates, the large connecting rod drives the intermediate shaft to move up and down, and the intermediate shaft drives the needle bar three-eye connecting rod to swing up and down. The needle bar three-eye connecting rod drives the needle bar driver to move up and down along the guide rod through the small connecting rod, so as to achieve the purpose of driving the corresponding needle bar to move up and down for embroidery. The components of the connecting rod structure are simple and can well meet the transmission requirements. The large connecting rod of each set of connecting rod structure drives the corresponding needle bar three-eye connecting rod to swing through the intermediate shaft, which improves the movement stability of the intermediate shaft, is conducive to improving the stability of the needle bar driver to move up and down through the needle bar small connecting rod driven by the needle bar three-eye connecting rod of each set of connecting rod structure, and thus is conducive to improving the working stability of the needle bar.

[0017] 3. The number of needle bar cams is half of the connecting rod structure. The large connecting rods of the two sets of connecting rod structures corresponding to a certain needle bar cam are arranged side by side on the needle bar cam in the horizontal direction. The two sets of large connecting rods of the connecting rod structure are driven by one needle bar cam, which reasonably reduces the number of needle bar cams while meeting the transmission requirements between the needle bar drive shaft and the connecting rod structure, which is conducive to further reasonably simplifying the internal structure of the machine head and reserving sufficient installation space for other components of the machine head.

[0018] 4. The two large connecting rods mounted on the same needle bar cam are limited in both directions in the axial direction through the limiting convex edge and the limiting plate, thereby improving the structural stability of the large connecting rod, which is beneficial to improving the stability of the connecting rod structure in driving the needle bar driver to move up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a head of an embroidery machine driven by multiple needle bars according to a first embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of a connecting rod structure and a needle bar driving shaft in a head of a multi-needle bar driven embroidery machine according to a first embodiment of the present invention;

[0021] Figure 3 for Figure 2 Exploded view of some components in the middle;

[0022] Figure 4 It is an exploded schematic diagram of some components of the connecting rod structure, the guide rod, and the needle bar driver in the head of a multi-needle bar driven embroidery machine according to the first embodiment of the present invention;

[0023] Figure 5 Another three-dimensional schematic diagram of the head of a multi-needle bar driven embroidery machine according to the first embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of a presser foot mechanism, a presser foot transmission mechanism and a presser foot adjustment mechanism in a head of a multi-needle bar driven embroidery machine according to a first embodiment of the present invention;

[0025] Figure 7 for Figure 6 Exploded view of some components in the middle;

[0026] Figure 8 It is a schematic diagram of an embroidery machine according to an embodiment of the present invention;

[0027] Fig. 9 It is a schematic diagram of a split drive transmission mechanism in an embroidery machine according to a first embodiment of the present invention;

[0028] Fig.10 It is a schematic diagram of the transmission matching structure between two adjacent needle bar driving shafts in an embroidery machine according to an embodiment of the present invention.

[0029] In the figure, 100-casing, 210-needle bar driving shaft, 211-transmission convex block, 212-transmission groove, 220-needle bar cam, 221-limiting convex edge, 230-limiting plate, 240-presser foot driving wheel, 241-cam groove, 310-guide rod, 320-needle bar driver, 400-connecting rod structure, 410-large connecting rod, 420-needle bar three-eye connecting rod, 430-needle bar small connecting rod, 440-intermediate shaft, 500-presser foot mechanism, 510-presser foot strip, 520-presser foot, 530-presser foot lifting rod, 540-presser foot driver, 600-presser foot transmission mechanism, 610-presser foot driving rod, 620- Presser foot transmission rod, 630-presser foot three-eye connecting rod, 640-presser foot small connecting rod, 650-linkage, 700-presser foot adjustment mechanism, 710-adjustment transmission shaft, 720-adjustment main pulley, 730-adjustment from the pulley, 740-adjustment transmission belt, 750-presser foot shaft, 760-adjustment cam, 770-pipe sleeve, 810-main shaft, 820-machine head module, 830-lower shaft, 840-transmission box, 851-second main pulley, 900-split drive mechanism, 910-first main pulley, 920-first from the pulley, 930-first transmission belt, 940-support, 941-through hole, 950-tensioning member. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following words indicating orientation or positional relationship such as "upper", "lower", "left", "right", "longitudinal", "lateral", "inner", "outer", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] Embodiment 1

[0032] like Figures 1 to 4 As shown, the first embodiment of the present invention provides a multi-needle bar driven embroidery machine head, including a housing 100, a needle bar drive shaft 210, a guide rod 310, a needle bar driver 320, a needle bar cam 220 and a connecting rod structure 400. The needle bar drive shaft 210 can be rotatably placed horizontally on the housing 100, the guide rod 310 is placed vertically on the housing 100, the needle bar driver 320 is sleeved on the guide rod 310, the needle bar cam 220 is sleeved on the needle bar drive shaft 210, and the connecting rod structure 400 is arranged between the needle bar cam 220 and the needle bar driver 320 and is used to drive the needle bar driver 320 to move up and down. The guide rod 310 and the needle bar driver 320 are both arranged 2N in intervals in the horizontal direction, N is a positive integer and a multiple of 2, and the connecting rod structure 400 is arranged N sets side by side in the horizontal direction, and each set of the connecting rod structure 400 drives two corresponding needle bar drivers 320.

[0033] In this embodiment, the axial direction of the needle bar drive shaft 210 is arranged along the left-right direction shown in the figure, and the front-back direction shown in the figure is arranged horizontally and perpendicularly to the left-right direction. The needle bar drive shaft 210 is rotatably mounted on the housing 100 through a bearing, the guide rod 310 is fixed to the front side of the housing 100, and the needle bar cam 220 is eccentrically sleeved on the needle bar drive shaft 210. Preferably, the guide rod 310 and the needle bar driver 320 in this embodiment are both provided with four at equal intervals in the horizontal direction, and the connecting rod structure 400 is provided with two sets side by side in the horizontal direction. In order to meet the small space installation requirements of the machine head, one needle bar cam 220 is provided, and two connecting rod structures 400 are both matched with the same needle bar cam 220.

[0034] The connecting rod structure 400 includes a large connecting rod 410, a needle bar three-eye connecting rod 420 and a needle bar small connecting rod 430. The large connecting rod 410 is sleeved on the needle bar cam 220 and is in transmission connection with the needle bar three-eye connecting rod 420. The rear end of the needle bar three-eye connecting rod 420 is rotatably connected to the housing 100. The two ends of the needle bar small connecting rod 430 are respectively rotatably connected to the needle bar three-eye connecting rod 420 and the needle bar driver 320. In this embodiment, a horizontal intermediate shaft 440 is provided on the housing 100. The intermediate shaft 440 is located below the needle bar driving shaft 210. The upper ends of the two large connecting rods 410 of the two sets of connecting rod structures 400 are sleeved side by side on the circumferential outer side of the needle bar cam 220 in the horizontal direction and are axially limited. The lower ends of the two large connecting rods 410 are sleeved on the intermediate shaft 440 and are tightened to the intermediate shaft 440 by bolts. The rod body parts of the two large connecting rods are arranged in an "eight" shape. The rear end of the needle bar three-eye connecting rod 420 is hinged to the housing 100 through a positioning pin, and the approximate middle part of the needle bar three-eye connecting rod 420 is set on the intermediate shaft 440 through a bearing sleeve, and the large connecting rod 410 and the needle bar three-eye connecting rod 420 are connected by the intermediate shaft 440. Each connecting rod structure 400 is provided with two needle bar small connecting rods 430 located on the left and right sides of the needle bar three-eye connecting rod 420, one end of the needle bar small connecting rod 430 is hinged to the front end of the needle bar three-eye connecting rod 420 through a connecting pin, and the other end is hinged to the corresponding needle bar driver 320 through a connecting pin. When the needle bar driving shaft 210 rotates, the needle bar cam 220 is driven to rotate. The needle bar cam 220 drives the needle bar driver 320 to move up and down relative to the guide rod 310 through the large connecting rod 410, the intermediate shaft 440, the needle bar three-eye connecting rod 420 and the needle bar small connecting rod 430. The needle bar driver 320 cooperates with the corresponding needle bar on the needle bar frame and drives the needle bar to move up and down, thereby achieving the purpose of driving multiple needle bars. Specifically, a set of connecting rod structures 400 on the left drives the two needle bar drivers 320 on the left, and a set of connecting rod structures 400 on the right drives the two needle bar drivers 320 on the right.

[0035] In order to limit the large connecting rod 410 axially, a limiting cam 221 is provided on the circumferential outer wall of the needle bar cam 220, and a limiting plate 230 is fixed to the needle bar cam 220 on the axial side away from the limiting cam 221. The outer diameter of the limiting plate 230 is larger than the outer diameter of the needle bar cam 220. One axial side of the two large connecting rods 410 contacts the limiting cam 221, and the other axial side contacts the limiting plate 230. The large connecting rod 410 mounted on the needle bar cam 220 is limited axially through the limiting cam 221 and the limiting plate 230.

[0036] like Figures 5 to 7 As shown, in order to ensure the quality of embroidery, the embroidery machine head of this embodiment also includes a presser foot driving wheel 240, a presser foot mechanism 500, a presser foot transmission mechanism 600 and a presser foot adjustment mechanism 700. The presser foot driving wheel 240 is eccentrically sleeved on the needle bar driving shaft 210, the presser foot mechanism 500 includes a presser foot bar 510, a presser foot 520 and a presser foot lifting rod 530, the presser foot bar 510 is horizontally arranged at the bottom of the housing 100, the presser foot 520 is arranged on the presser foot bar 510 and is arranged in multiple intervals along the horizontal direction, and the presser foot lifting rod 530 is vertically arranged on the housing 100 and the bottom end is connected to the presser foot bar 510. The presser foot transmission mechanism 600 is arranged between the presser foot driving wheel 240 and the presser foot lifting rod 530 and is used to drive the presser foot mechanism 500 to move up and down, and the presser foot adjustment mechanism 700 is arranged on the housing 100 and adjusts the vertical position of the presser foot mechanism 500 through the presser foot transmission mechanism 600.

[0037] In this embodiment, the number of presser feet 520 corresponds to the number of needle bar drivers 320, that is, four presser feet 520 are arranged at equal intervals in the horizontal direction. In order to improve the stability of the up and down movement of the presser foot mechanism 500, two presser foot lifting rods 530 are arranged at intervals in the horizontal direction and correspond to the two ends of the presser foot strip 510. In order to prevent the presser foot mechanism 500 from interfering with the cooperation between the needle bar driver 320 and the needle bar, the left presser foot lifting rod 530 is located on the left side of the leftmost guide rod 310, and the right presser foot lifting rod 530 is located on the right side of the rightmost guide rod 310.

[0038] In order to improve the lifting stability of the presser foot mechanism 500, the presser foot mechanism 500 also includes a presser foot driver 540 corresponding to the presser foot lifting rod 530. The left presser foot driver 540 is sleeved on the leftmost guide rod 310 and located at the bottom of the needle bar driver 320. The right presser foot driver 540 is sleeved on the rightmost guide rod 310 and located at the bottom of the needle bar driver 320. The top of the left presser foot lifting rod 530 is fixedly connected to the left presser foot driver 540, and the top of the right presser foot lifting rod 530 is fixedly connected to the right presser foot driver 540. Correspondingly, the presser foot transmission mechanism 600 is provided with two sets of presser foot drivers 540 at intervals in the lateral direction and are arranged one by one with the two presser foot drivers 540.

[0039] Combination Figure 7The presser foot transmission mechanism 600 includes a presser foot driving rod 610, a presser foot transmission rod 620, a presser foot three-eye connecting rod 630 and a presser foot small connecting rod 640. The presser foot adjustment mechanism 700 includes an adjustment motor, an adjustment transmission structure and a presser foot shaft 750. The presser foot shaft 750 is rotatably mounted on the casing 100 through a bearing and is located below the needle bar driving shaft 210. The outer sleeve of the presser foot shaft 750 is provided with a pipe sleeve 770.

[0040] The front end of the presser foot driving rod 610 is provided with a rotatable linkage member 650, and the axial side wall of the presser foot driving wheel 240 is provided with a cam groove 241 that cooperates with the linkage member 650. The linkage member 650 is located in the cam groove 241, and the front end of the presser foot driving rod 610 cooperates with the presser foot driving wheel 240 through the cooperation of the linkage member and the cam groove. Specifically, the linkage member 650 includes a linkage bearing provided at the front end of the presser foot driving rod 610 through a connecting pin and a linkage wheel sleeved on the outside of the linkage bearing.

[0041] The rear end of the presser foot driving rod 610 is sleeved on the outside of the pipe sleeve 770 to realize a rotatable setting, the rear end of the presser foot three-eye connecting rod 630 is sleeved on the outside of the presser foot shaft 750, one end of the presser foot transmission rod 620 is hinged to the presser foot driving rod 610 through a connecting pin, and the other end is hinged to the approximately middle part of the presser foot three-eye connecting rod 630 through a connecting pin, one end of the presser foot small connecting rod 640 is hinged to the front end of the presser foot three-eye connecting rod 630 through a connecting pin, and the other end is hinged to the corresponding presser foot driver 540 through a connecting pin. When the needle bar driving shaft 210 rotates, the presser foot driving wheel 240 is driven to rotate. The presser foot driving wheel 240 drives the presser foot three-eye connecting rod 630 to swing up and down through the linkage part 650, the presser foot driving rod 610 and the presser foot transmission rod 620. The presser foot three-eye connecting rod 630 drives the presser foot driver 540 to move up and down relative to the guide rod 310 through the presser foot small connecting rod 640. The presser foot driver 540 drives the presser foot 520 to move up and down through the presser foot lifting rod 530 and the presser foot strip 510, so that the presser foot 520 can cooperate with the needle bar to achieve the purpose of repeatedly pressing the upper thread when the embroidery machine is working.

[0042] In this embodiment, the adjustment transmission structure includes an adjustment transmission shaft 710, an adjustment main pulley 720, an adjustment slave pulley 730 and an adjustment transmission belt 740. The adjustment transmission shaft 710 is driven by an adjustment motor. The adjustment transmission shaft 710 is axially arranged horizontally and is arranged at the rear side of the housing 100. The adjustment main pulley 720 is sleeved on the adjustment transmission shaft 710. The adjustment slave pulley 730 is sleeved on the presser foot shaft 750. The adjustment transmission belt 740 is sleeved on the adjustment main pulley 720 and the adjustment slave pulley 730. The adjustment motor drives the adjustment transmission shaft 710 to rotate. The adjustment transmission shaft 710 drives the presser foot shaft 750 to rotate through the pulley structure. When the presser foot shaft 750 rotates, it can drive the presser foot three-eye connecting rod 630 to swing up and down. The presser foot adjustment mechanism 700 adjusts the vertical position of the presser foot mechanism 500 by adjusting the inclination angle between the presser foot three-eye connecting rod 630 and the horizontal direction. When the embroidery cloth needs to be replaced or the embroidery machine needs to be stopped, the presser foot mechanism 500 can be lifted by the presser foot adjustment mechanism 700 to prevent the presser foot mechanism 500 from interfering with the operation of replacing the embroidery cloth. After the operation is completed, the presser foot mechanism 500 is lowered by the presser foot adjustment mechanism 700, so that the presser foot mechanism 500 can reciprocate up and down under the drive of the presser foot transmission mechanism 600 to achieve the purpose of repeatedly pressing the upper thread.

[0043] In this embodiment, in order to increase the amplitude of the presser foot three-eye connecting rod 630 to swing up and down driven by the presser foot adjustment mechanism 700, the presser foot adjustment mechanism 700 also includes an adjustment cam 760 eccentrically sleeved on the presser foot shaft 750, and the rear end of the presser foot three-eye connecting rod 630 is sleeved on the outside of the adjustment cam 760 and is axially limited.

[0044] This embodiment also provides an embroidery machine, including the embroidery machine head described above.

[0045] Combination Figure 8 , Fig. 9 The embroidery machine of this embodiment adopts a modular structure, including a transverse main shaft 810, a main drive motor for driving the main shaft 810 and a plurality of head modules 820 arranged at intervals along the transverse direction. The main shaft 810 is arranged outside each head module 820, and each head module 820 is provided with a transverse needle bar drive shaft 210. A separate drive transmission mechanism 900 is provided between the needle bar drive shaft 210 of each head module 820 and the main shaft 810.

[0046] In this embodiment, the main shaft 810 is arranged above the head module 820, and each head module 820 is provided with two of the above-mentioned heads arranged side by side in the horizontal direction. Each head is provided with a needle bar drive shaft 210, and the split-drive transmission mechanism 900 is arranged one-to-one corresponding to the head module 820. The output end of each split-drive transmission mechanism 900 cooperates with one of the needle bar drive shafts 210 of the head module 820, and a transmission cooperation structure is provided between the two needle bar drive shafts 210.

[0047] The split drive mechanism 900 includes a first main pulley 910, a first secondary pulley 920 and a first transmission belt 930. The first main pulley 910 is sleeved on the main shaft 810, the first secondary pulley 920 is sleeved on one of the needle bar drive shafts 210 of the head module 820, and the first transmission belt 930 is sleeved on the first main pulley 910 and the first secondary pulley 920. Fig.10 , the transmission matching structure between two adjacent needle bar drive shafts 210, the transmission matching structure includes a transmission protrusion 211 and a transmission groove 212 that match each other, the transmission protrusion 211 and the transmission groove 212 are respectively arranged at the ends of the two adjacent needle bar drive shafts 210, and the transmission protrusion 211 is stuck in the transmission groove 212. The main shaft 810 drives one of the needle bar drive shafts 210 of the head module 820 to rotate through the split drive mechanism 900, and the needle bar drive shaft 210 then drives the other needle bar drive shafts 210 to rotate synchronously through the transmission matching structure. In this embodiment, the transmission protrusion 211 and the transmission groove 212 are both in the shape of a "one".

[0048] In order to improve the transmission effectiveness between the main shaft 810 and the needle bar driving shaft 210, each sub-drive transmission mechanism 900 also includes a tensioning structure for tensioning the first transmission belt 930, the tensioning structure includes a fixed support 940 and a tensioning member 950 rotatably arranged on the support 940, and the tensioning member 950 is in conflict with the first transmission belt 930. In this embodiment, the embroidery machine includes a frame, the support 940 is fixed on the frame, the support 940 is provided with a through hole 941 whose inner diameter is larger than the outer diameter of the main shaft 810, and the main shaft 810 is arranged through the support 940 from the through hole 941. The tensioning member 950 includes a tensioning bearing and a tensioning wheel, the tensioning bearing is rotatably arranged on the support 940 through a connecting pin, the tensioning wheel is fixedly sleeved on the outside of the tensioning bearing, and the circumferential outer wall of the tensioning wheel is in conflict with the first transmission belt 930 to tension the first transmission belt 930.

[0049] The embroidery machine of this embodiment also includes a lower shaft 830 and a transmission box 840. The lower shaft 830 is horizontally placed at the bottom of the head module 820 and is used to drive components such as the shuttle box. An inter-axial transmission structure located between the main shaft 810 and the lower shaft 830 is provided in the transmission box 840. The main shaft 810 drives the lower shaft 830 to rotate through the inter-axial transmission structure.

[0050] The transmission box 840 is fixed on the frame. In order to improve the stability of transmission, two transmission boxes 840 are provided. The two transmission boxes 840 are respectively located at the left and right ends of the main shaft 810 and the lower shaft 830. The two transmission boxes 840 are provided with an inter-axial transmission structure. The left end of the main shaft 810 and the left end of the lower shaft 830 extend into the transmission box 840 on the left, and the right end of the main shaft 810 and the right end of the lower shaft 830 extend into the transmission box 840 on the right. The inter-axial transmission structure adopts a pulley structure, including a second main pulley 851, a second slave pulley and a second transmission belt. The second main pulley 851 is sleeved on the main shaft 810, the second slave pulley is sleeved on the lower shaft 830, and the second transmission belt is sleeved on the second main pulley 851 and the second slave pulley.

[0051] When the main drive motor is working, it drives the main shaft 810 to rotate, and the main shaft 810 drives the needle bar drive shaft 210 on each head module 820 to rotate through the split drive transmission mechanism 900. The needle bar drive shaft 210 drives the needle bar driver 320 to move up and down through the needle bar cam 220 and the connecting rod structure 440, and the needle bar driver 320 drives the needle bar that cooperates with it to move up and down to perform embroidery. At the same time, the needle bar drive shaft 210 drives the presser foot mechanism 500 to move up and down through the presser foot cam 240 and the presser foot transmission mechanism 600, so that the presser foot 520 can work with the needle bar to achieve the purpose of repeatedly pressing the upper thread.

[0052] When the embroidery cloth needs to be replaced, the presser foot mechanism 500 can be lifted upwards by the presser foot adjustment mechanism 700. After the replacement is completed, the presser foot mechanism 500 is moved down to the working position by the presser foot adjustment mechanism 700.

[0053] It is understandable that the specific number of the guide rod 310, needle bar driver 320, connecting rod structure 400 and needle bar cam 220 on each machine head is not limited to the above description and the drawings. If the transverse dimension of the machine head increases, the number of the guide rod 310 and the needle bar driver 320 can also be increased accordingly. For example, eight guide rods 310 and needle bar drivers 320 are arranged at equal intervals in the transverse direction. At this time, two needle bar cams 220 are sleeved on the needle bar drive shaft 210, and four connecting rod structures 400 are arranged. The large connecting rods 410 of the two connecting rod structures 400 on the left are sleeved on the needle bar cam 220 on the left, and the large connecting rods 410 of the two connecting rod structures 400 on the right are sleeved on the needle bar cam 220 on the right. The intermediate shaft 440 can be set to one, and the lower ends of the large connecting rods 410 of the four connecting rod structures 400 are all tightly holding the intermediate shaft 440. Of course, two intermediate shafts 440 may be arranged at intervals in the transverse direction, the left intermediate shaft 440 cooperates with the large connecting rods 410 of the two sets of connecting rod structures 400 on the left, and the right intermediate shaft 440 cooperates with the large connecting rods 410 of the two sets of connecting rod structures 400 on the right.

[0054] It can be understood that the number of presser feet 520 in the presser foot mechanism 500 is consistent with the number of needle bar drivers 320, that is, the presser feet and the needle bar drivers are arranged in a one-to-one correspondence.

[0055] It is understandable that another limiting plate may be used to replace the limiting protrusion 221 on the circumferential outer wall of the needle bar cam 220 to limit the large connecting rod 410 axially. In this case, the two limiting plates are respectively fixed on both sides of the axial direction of the needle bar cam 220.

[0056] It is understandable that the specific shapes of the transmission protrusion 211 and the transmission groove 212 are not limited to the "I" shape as described above and shown in the drawings, and can also be set to other reasonable shapes such as a "X" shape and a "M" shape.

[0057] It is understandable that the specific number of heads in each head module 820 is not limited to the two as described above and shown in the drawings, but may also be set to one, three or other reasonable numbers.

[0058] It is understandable that the presser foot mechanism 500, the presser foot transmission mechanism 600 and the presser foot adjustment mechanism 700 may also adopt other specific structures.

[0059] In addition to the above preferred embodiments, the present invention has other implementation modes. Those skilled in the art may make various changes and modifications based on the present invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope defined in the claims of the present invention.

Claims

1. A multi-needle bar driven embroidery machine head, comprising a housing, a needle bar drive shaft, a guide rod, a needle bar driver, a needle bar cam and a connecting rod structure, wherein the needle bar drive shaft can be rotatably placed horizontally on the housing, the guide rod is vertically placed on the housing, the needle bar driver is sleeved on the guide rod, the needle bar cam is sleeved on the needle bar drive shaft, the connecting rod structure is arranged between the needle bar cam and the needle bar driver and is used to drive the needle bar driver to move up and down, characterized in that: The guide rods and needle bar drivers are both arranged at intervals of 2N in the transverse direction, where N is a positive integer and a multiple of 2, and N sets of connecting rod structures are arranged side by side in the transverse direction, and each set of connecting rod structures drives two corresponding needle bar drivers; The connecting rod structure includes a large connecting rod, a needle bar three-eye connecting rod and a needle bar small connecting rod. The large connecting rod is sleeved on the needle bar cam and is transmission-connected to the needle bar three-eye connecting rod. The rear end of the needle bar three-eye connecting rod is rotationally connected to the housing. The two ends of the needle bar small connecting rod are rotationally connected to the needle bar three-eye connecting rod and the needle bar driver respectively. The housing is provided with a horizontal intermediate shaft, the bottom end of the large connecting rod holds the intermediate shaft tightly, the needle bar three-eye connecting rod is sleeved on the intermediate shaft, and the large connecting rod drives the needle bar three-eye connecting rod to swing up and down through the intermediate shaft; Each set of the connecting rod structure is provided with two small needle bar connecting rods respectively located on the lateral sides of the needle bar three-eye connecting rod, one end of the two small needle bar connecting rods is hinged to the front end of the needle bar three-eye connecting rod, and the other end is hinged to the corresponding needle bar driver; The needle bar cams are arranged at intervals of N / 2 in the transverse direction, and the large connecting rods of the two adjacent sets of connecting rod structures corresponding to the needle bar cams are sleeved on the needle bar cams side by side in the transverse direction and are axially limited; The embroidery machine head also includes a presser foot driving wheel, a presser foot mechanism, a presser foot transmission mechanism and a presser foot adjustment mechanism. The presser foot driving wheel is eccentrically sleeved on the needle bar driving shaft.

2. The multi-needle bar driven embroidery machine head according to claim 1, characterized in that: A limiting convex edge is arranged on the circumferential outer wall of the needle bar cam, and one axial side of the large connecting rod abuts against the limiting convex edge and is axially limited.

3. The multi-needle bar driven embroidery machine head according to claim 1, characterized in that: A limiting plate is provided on one axial side of the needle bar cam, the outer diameter of the limiting plate is larger than the outer diameter of the needle bar cam, and the other axial side of the large connecting rod abuts against the limiting plate and is axially limited.

4. The multi-needle bar driven embroidery machine head according to claim 1, characterized in that: The rear end of the needle bar three-eye connecting rod is hinged on the casing through a positioning pin.

5. The multi-needle bar driven embroidery machine head according to claim 1, characterized in that: The guide rods and the needle rod drivers are both provided with four at equal intervals in the transverse direction, and the connecting rod structure is provided with two sets.

6. An embroidery machine, characterized in that: A multi-needle bar driven embroidery machine head comprising any one of claims 1 to 5.

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