Needle bar connecting structure and needle bar driving mechanism

Abstract

The utility model discloses a needle bar connecting structure and a needle bar driving mechanism, and relates to the technical field of eyelet buttonholing machines, and a needle bar is arranged on a machine shell through the needle bar connecting structure; the needle bar connecting structure comprises a supporting connecting rod; the connecting outer ring is rotationally connected with the bottom end of the supporting connecting rod through two first pin shafts, sliding blocks are arranged at the ends, located on the outer side of the supporting connecting rod, of the two first pin shafts, and the sliding blocks are slidably connected with the guide grooves of the assembling cavity; the connecting inner ring is rotationally connected with the connecting outer ring through two second pin shafts, and the needle rod penetrates through a central through hole located in the connecting inner ring; the upper check ring and the lower check ring are respectively fixed on the needle rod, the upper check ring is positioned at the upper end of the connecting inner ring, and the lower check ring is positioned at the lower end of the connecting inner ring. According to the needle bar connecting structure, the technical problems that an existing connecting structure is complex in component and unstable in work are solved, and the technical effects that the needle bar connecting structure is simplified, and the stability and reliability of the needle bar connecting structure are improved are achieved.

Description

Technical Field

[0001] This utility model relates to the field of round-head buttonhole machine technology, and in particular to a needle bar connection structure and a needle bar driving mechanism. Background Technology

[0002] In the field of sewing machinery, round-head buttonhole machines are widely used in the garment processing industry. Round-head buttonhole machines complete buttonhole operations through the swinging and up-and-down movement of the needle bar, and their efficiency and stability directly affect the production quality and efficiency of garments.

[0003] Traditional buttonhole machines typically use a drive mechanism to achieve the oscillation and vertical movement of the needle bar. The oscillation is controlled by an oscillation drive mechanism, while the vertical movement is controlled by a vertical movement mechanism. A Chinese patent (application number: 200610054932.X) discloses a vertical movement transmission structure, which includes an annular component and a pair of upper and lower needle bar components. The annular component has a space defined by its inner circumference, and a oscillation clearance is ensured between the outer circumference of the needle bar and the inner circumference of the annular component. However, while this design achieves the oscillation and vertical movement of the needle bar to a certain extent, its structure is overly complex, using numerous hinge points, which can lead to problems such as unstable connections and high operating noise during use.

[0004] Therefore, how to provide a needle bar connection structure that simplifies the needle bar connection structure and improves its stability and reliability is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a needle bar connection structure and a needle bar drive mechanism, which solves the technical problems of overly complex structure and unstable operation.

[0006] To achieve the above objectives, this utility model provides a needle bar connection structure, wherein the needle bar is disposed on the machine housing via the needle bar connection structure; the needle bar connection structure includes:

[0007] Support link;

[0008] The outer ring is rotatably connected to the bottom end of the support rod via two first pins. Each of the two first pins located on the outer side of the support rod is provided with a slider, and the slider is slidably connected to the guide groove of the assembly cavity.

[0009] The inner ring is rotatably connected to the outer ring via two second pins, and the needle bar passes through the central through hole of the inner ring.

[0010] The upper retaining ring and the lower retaining ring are fixed on the needle bar, with the upper retaining ring located at the upper end of the connecting inner ring and the lower retaining ring located at the lower end of the connecting inner ring.

[0011] Preferably, the bottom end of the supporting connecting rod is symmetrically provided with a first mounting hole, the side wall of the connecting outer ring is symmetrically provided with a second mounting hole and a third mounting hole, the connecting inner ring is provided with a fourth mounting hole about the central through hole, the first end of each first pin is provided in the first mounting hole and the second end is provided in the second mounting hole, the first end of each second pin is provided in the third mounting hole and the second end is provided in the fourth mounting hole.

[0012] Preferably, the support rod is provided with a first locking hole that communicates with the first mounting hole, and the first locking screw cooperates with the first locking hole to fix the first end of the first pin in the first mounting hole. The connecting outer ring is provided with a second locking hole that communicates with the third mounting hole, and the second locking screw cooperates with the second locking hole to fix the second end of the second pin in the third mounting hole.

[0013] Preferably, each first pin is provided with a retaining ring for limiting the axial movement of the slider.

[0014] Preferably, both the upper retaining ring and the lower retaining ring are provided with a central hole through which the needle bar passes, both the upper retaining ring and the lower retaining ring are provided with a gap groove communicating with the central hole, and a threaded hole communicating with the gap groove is provided in a direction perpendicular to the gap groove. The screw cooperates with the threaded hole to fix the upper retaining ring and the lower retaining ring on the needle bar.

[0015] Preferably, both ends of the needle bar are provided with needle bar upper sleeves, which are disposed in the assembly cavity of the housing.

[0016] A needle bar drive mechanism includes the needle bar connection structure described above. The drive mechanism includes a drive shaft and a crank. A connecting hole is provided at the top end of the support connecting rod. The drive shaft is mounted on the housing via a bearing. The crank is connected to the tail end of the drive shaft. The crank pin of the crank is disposed in the connecting hole to realize the vertical reciprocating motion of the needle bar.

[0017] Compared to the aforementioned background technology, the needle bar connection structure provided by this utility model has an outer connecting ring connected to a support rod via a first pin, and the outer ring can move axially and rotate circumferentially within a certain range along the first pin; the inner connecting ring is connected to the outer connecting ring via a second pin, and the inner connecting ring can move axially and rotate circumferentially within a certain range along the second pin; the needle bar passes through the central through hole of the inner connecting ring and is limited by an upper retaining ring and a lower retaining ring, but at the same time, it is allowed to rotate in the circumferential direction and reciprocate in the vertical direction.

[0018] In summary, the needle bar connection structure provided in this application not only simplifies the needle bar connection structure compared with the prior art, but also improves its stability and flexibility, enabling the needle bar to work more efficiently and stably in a round-head buttonhole machine. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a needle bar swing device provided in an embodiment of the present utility model;

[0021] Figure 2 An isometric view of a needle bar connection structure provided in an embodiment of this utility model;

[0022] Figure 3 This is an exploded view of a needle bar connection structure provided in an embodiment of the present utility model.

[0023] Specifically:

[0024] 1-Main housing, 2-Needle bar, 3-Oscillating mechanism, 4-Supporting connecting rod, 5-Connecting outer ring, 6-First pin, 7-Slider, 8-Guide groove, 9-Connecting inner ring, 10-Second pin, 11-Upper retaining ring, 12-Lower retaining ring, 13-First mounting hole, 14-Second mounting hole, 15-Third mounting hole, 16-Fourth mounting hole, 17-Locking screw, 18-Shaft retaining ring, 19-Needle bar upper sleeve, 20-Drive shaft, 21-Crank, 22-Connecting hole, 23-Bearing, 24-Crank pin, 25-Screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See Figures 1-3This application provides a needle bar connection structure, in which the needle bar 2 is mounted on the housing 1. The needle bar connection structure includes: a supporting connecting rod 4; a connecting outer ring 5, which is rotatably connected to the bottom end of the supporting connecting rod 4 via two first pins 6; each of the two first pins 6 located on the outer side of the supporting connecting rod 4 is provided with a slider 7, which is slidably connected to the guide groove 8 of the assembly cavity of the housing 1; a connecting inner ring 9, which is rotatably connected to the connecting outer ring 5 via two second pins 10; the straight line formed by the two first pins 6 and the straight line formed by the two second pins 10 are perpendicular to each other; the needle bar 2 passes through the central through hole of the connecting inner ring 9; an upper retaining ring 11 and a lower retaining ring 12, which are respectively fixed on the needle bar 2, with the upper retaining ring 11 located at the upper end of the connecting inner ring 9 and the lower retaining ring 12 located at the lower end of the connecting inner ring 9.

[0028] Specifically, the support link 4 is U-shaped, and its bottom end is rotatably connected to the connecting outer ring 5 through two first pins 6. The two first pins 6 not only realize the rotatable connection between the support link 4 and the connecting outer ring 5, but also ensure the stability of the connection. In addition, the ends of the two first pins 6 located on the outside of the support link 4 are provided with sliders 7. The sliders 7 are slidably connected to the guide grooves 8 in the assembly cavity of the housing 1, so that the support link 4 can realize vertical reciprocating motion on the housing 1.

[0029] The inner connecting ring 9 is rotatably connected to the outer connecting ring 5 via two second pins 10. In this application, an upper retaining ring 11 and a lower retaining ring 12 are fixed on the needle bar 2. The upper retaining ring 11 is located at the upper end of the inner connecting ring 9, and the lower retaining ring 12 is located at the lower end of the inner connecting ring 9, which ensures the stability of the needle bar 2 in the vertical direction without affecting its free rotation in the circumferential direction.

[0030] In summary, the outer connecting ring 5 is connected to the supporting connecting rod 4 via the first pin 6, and can move axially and rotate circumferentially within a certain range along the first pin 6; the inner connecting ring 9 is connected to the outer connecting ring 5 via the second pin 10, and can move axially and rotate circumferentially within a certain range along the second pin 10; the needle bar 2 passes through the central through hole of the inner connecting ring 9 and is limited by the upper retaining ring 11 and the lower retaining ring 12, but at the same time it is allowed to rotate in the circumferential direction and reciprocate in the vertical direction. This not only simplifies the needle bar connection structure, but also improves its stability and flexibility, enabling the needle bar 2 to work more efficiently and stably in sewing equipment such as round-head buttonhole machines.

[0031] Based on the above embodiment, the bottom end of the support rod 4 is symmetrically provided with a first mounting hole 13, which provides a mounting position for the first pin 6. The side wall of the connecting outer ring 5 is symmetrically provided with a second mounting hole 14 and a third mounting hole 15. The second mounting hole 14 corresponds to the first mounting hole 13 at the bottom end of the support rod 4 and is used to receive the second end of the first pin 6, thereby realizing the rotational connection between the support rod 4 and the connecting outer ring 5. The third mounting hole 15 provides a mounting position for the second pin 10, so that the second pin 10 can connect the outer ring 5 and the connecting inner ring 9.

[0032] The inner ring 9 is provided with a fourth mounting hole 16 about the central through hole. The fourth mounting hole 16 corresponds to the third mounting hole 15 on the outer ring 5 and is used to receive the second end of the second pin 10, thereby realizing the rotational connection between the outer ring 5 and the inner ring 9.

[0033] The first end of each first pin 6 is disposed in the first mounting hole 13 at the bottom of the support connecting rod 4, and the second end is disposed in the second mounting hole 14 on the side wall of the connecting outer ring 5. Thus, the first pin 6 connects the support connecting rod 4 and the connecting outer ring 5 together, and allows the connecting outer ring 5 to move axially within a certain range (until the connecting outer ring 5 abuts against the inner end face of the first mounting hole 13) and rotate circumferentially.

[0034] Similarly, the first end of each second pin 10 is disposed in the third mounting hole 15 on the side wall of the connecting outer ring 5, and the second end is disposed in the fourth mounting hole 16 on the connecting inner ring 9. In this way, the second pin 10 securely connects the connecting outer ring 5 and the connecting inner ring 9 together, and allows the connecting inner ring 9 to move axially and rotate circumferentially within a certain range.

[0035] Based on the above embodiments, the support rod 4 is provided with a first locking hole that connects to the first mounting hole 13. By cooperating with the first locking screw 17 and the first locking hole, the first end of the first pin 6 can be firmly fixed in the first mounting hole 13 to prevent it from loosening or falling off during operation.

[0036] Similarly, the connecting outer ring 5 is provided with a second locking hole that connects to the third mounting hole 15. By cooperating with the second locking screw and the second locking hole, the second end of the second pin 10 can be firmly fixed in the third mounting hole 15, ensuring its stability and reliability during operation.

[0037] Based on the above embodiments, each first pin 6 is provided with a shaft retaining ring 18 for limiting the axial movement of the slider 7. The shaft retaining ring 18 can be fitted onto the first pin 6 and effectively prevent the slider 7 from moving excessively in the axial direction.

[0038] Based on the above embodiments, both the upper retaining ring 11 and the lower retaining ring 12 are provided with a central hole through which the needle bar 2 passes, so that the upper retaining ring 11 and the lower retaining ring 12 can freely pass through the needle bar 2. In addition, both the upper retaining ring 11 and the lower retaining ring 12 are provided with a gap groove communicating with the central hole. In order to ensure that the upper retaining ring 11 and the lower retaining ring 12 can be firmly fixed on the needle bar 2, a threaded hole communicating with the gap groove is provided in the direction perpendicular to the gap groove. By the screw 25 cooperating with the threaded hole, the upper retaining ring 11 and the lower retaining ring 12 are tightly fixed on the needle bar 2, thereby realizing the upper and lower limit of the needle bar 2.

[0039] Based on the above embodiments, needle bar 2 is provided with needle bar upper sleeves 19 at both ends. The needle bar upper sleeves 19 are set in the assembly cavity of the housing 1. That is to say, the needle bar upper sleeves 19 are tightly fitted on the needle bar 2, providing additional support for the needle bar 2 and improving the operational stability of the equipment.

[0040] A needle bar vertical drive mechanism includes a drive shaft 20 and a crank 21. The drive shaft 20 is fixed to the housing 1 via a bearing 23 and can rotate around its own axis. The drive shaft 20 is the power input end and is typically driven by a motor. Connected to the tail end of the drive shaft 20, the crank 21 rotates with it. A crank pin 24 is provided on the crank 21 for connecting to a support connecting rod 4. The top end of the support connecting rod 4 has a connecting hole 22 into which the crank pin 24 is inserted, connecting the crank 21 to the support connecting rod 4. A slider 7 is provided at the end of the first pin 6 located outside the support connecting rod 4. The slider 7 is disposed in a guide groove 8 fixed to the housing 1 and can slide within the guide groove.

[0041] Working principle:

[0042] When the drive shaft 20 rotates, the crank 21 rotates accordingly. The rotational motion of the crank 21 is transmitted to the supporting connecting rod 4 through the crank pin 24. The supporting connecting rod 4 drives the slider 7 to slide in the guide groove 8 (sliding up and down reciprocally). The connecting outer ring 5 is connected to the connecting inner ring 9 through the second pin 10 and moves together with the up and down movement of the supporting connecting rod 4. Since the needle bar 2 is limited on the connecting inner ring 9 by the upper retaining ring 11 and the lower retaining ring 12, it moves up and down with the connecting inner ring 9, realizing the up and down reciprocating motion of the needle bar 2.

[0043] A needle bar drive mechanism includes a rotating mechanism and a swinging mechanism 3. The needle bar rotating mechanism is mounted on a housing 1, and its output end is connected to a needle bar 2 to achieve circumferential rotation of the needle bar 2. The needle bar rotating mechanism includes a power source (motor), with the motor's output shaft connected to a driving pulley and a driven pulley connected to the needle bar 2. A synchronous belt is wound around the driving and driven pulleys. The rotation of the motor drives the driving pulley to rotate, which in turn drives the driven pulley to rotate via the synchronous belt, thereby rotating the needle bar 2. Specifically, the needle bar rotating mechanism is a direct application of existing mature technology; therefore, the specific structure of the needle bar rotating mechanism will not be described in detail here.

[0044] A needle bar swing mechanism is mounted on a housing 1, and its output end is connected to a needle bar 2 to enable the needle bar 2 to rotate in any direction.

[0045] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0046] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A needle bar connection structure characterized by comprising: Used to connect the needle bar (2) to the housing (1); the needle bar connection structure includes: Support link (4); The outer ring (5) is rotatably connected to the bottom end of the support rod (4) through two first pins (6). The ends of the two first pins (6) located outside the support rod (4) are provided with sliders (7). The sliders (7) are used to slide with the guide groove (8) of the housing (1). The inner ring (9) is rotatably connected to the outer ring (5) via two second pins (10), and the needle bar (2) passes through the central through hole of the inner ring (9); The upper retaining ring (11) and the lower retaining ring (12) are fixed on the needle bar (2), respectively. The upper retaining ring (11) is located at the upper end of the connecting inner ring (9), and the lower retaining ring (12) is located at the lower end of the connecting inner ring (9).

2. The needle bar connection structure according to claim 1, wherein The The bottom end of the supporting connecting rod (4) is symmetrically provided with a first mounting hole (13). The side wall of the connecting outer ring (5) is symmetrically provided with a second mounting hole (14) and a third mounting hole (15). The connecting inner ring (9) is provided with a fourth mounting hole (16) symmetrical about the central through hole. The first end of each first pin (6) is set in the first mounting hole (13) and the second end is set in the second mounting hole (14). The first end of each second pin (10) is set in the third mounting hole (15) and the second end is set in the fourth mounting hole (16).

3. The needle bar linkage structure of claim 2, wherein The support rod (4) is provided with a first locking hole that connects to the first mounting hole (13). The first locking screw (17) cooperates with the first locking hole to fix the first end of the first pin (6) in the first mounting hole (13). The connecting outer ring (5) is provided with a second locking hole that connects to the third mounting hole (15). The second locking screw cooperates with the second locking hole to fix the second end of the second pin (10) in the third mounting hole (15).

4. The needle bar connection structure according to claim 1, characterized in that, Each first pin (6) is provided with a retaining ring (18) for limiting the axial movement of the slider (7).

5. The needle bar linkage structure of claim 1 wherein, Both the upper retaining ring (11) and the lower retaining ring (12) are provided with a central hole through which the needle bar (2) passes. Both the upper retaining ring (11) and the lower retaining ring (12) are provided with a gap groove that communicates with the central hole, and a threaded hole that communicates with the gap groove is provided in a direction perpendicular to the gap groove. The screw (25) cooperates with the threaded hole to fix the upper retaining ring (11) and the lower retaining ring (12) on the needle bar (2).

6. The needle bar linkage structure of claim 2 wherein, Both ends of the needle bar (2) are provided with needle bar upper sleeves (19), which are used to be installed in the assembly cavity of the housing (1).

7. A needle bar drive mechanism characterized by, The needle bar connection structure includes any one of claims 1-6, wherein the needle bar drive mechanism includes a drive shaft (20) and a crank (21), the top end of the support connecting rod (4) is provided with a connecting hole (22), the drive shaft (20) is mounted on the housing (1) via a bearing (23), the crank (21) is connected to the tail end of the drive shaft (20), and the crank pin (24) of the crank (21) is disposed in the connecting hole (22).

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