Machine head cam assembly and machine head part for embroidery machine

Abstract

The utility model relates to the field of embroidery machine parts, and discloses a cam component and a machine head component for an embroidery machine, which comprise a cam and a connecting arm fixedly connected with the cam, and one end of the connecting arm is provided with a connecting hole. And the groove I is used as a groove for mounting a rolling body on the outer ring of the bearing. One end of the first connecting rod is installed in the connecting hole, and the other end of the first connecting rod is used for being connected with the third connecting rod. The first connecting rod is provided with a second annular groove along the outer side face of the first connecting rod, the second groove and the first groove form a groove of the bearing, a rolling body is assembled in the groove, and the first connecting rod and the connecting arm are matched through the first groove, the second groove and the rolling body to form a bearing structure. The device has the advantages of good stability, low failure rate, convenience in installation, low noise and the like.

Description

Technical Field

[0001] The utility model relates to the field of embroidery machine parts, in particular to a head component and a head component for an embroidery machine. Background Art

[0002] In the prior art, the needle bar cam and the thread take-up lever drive cam mechanism in the embroidery machine head are eccentric cams. For example, the applicant's prior Chinese patent application CN201410109821.9 discloses a needle bar cam mechanism of a computer embroidery machine with a balance device. During the rotation of the eccentric cam, due to the action of inertia, the head vibrates too much, not only generating noise but also affecting the life of the head and the embroidery thread breakage rate. Moreover, generally, the cam mechanism and the three-eye connecting rod are connected by a connecting pin. Since the three-eye connecting rod and the connecting arm of the cam structure need to reciprocate at high speed, and a clearance generally needs to be set between the connecting pin and the two to ensure relative rotation, it is very difficult to maintain parameters such as coaxiality during high-speed movement, resulting in noise and jamming and shaking phenomena. And this kind of structure has more parts, and it is very inconvenient to install and maintain due to the narrow installation space. Summary of the Utility Model

[0003] The utility model aims at the shortcomings in the prior art and provides a head component for an embroidery machine and an electromechanical braking system.

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] A head cam assembly for an embroidery machine includes a cam and a connecting arm fixedly connected to the cam. One end of the connecting arm is provided with a connecting hole, and a circular groove I is formed along the inner side surface of the connecting hole. The groove I is used as a groove for installing rolling elements for the outer ring of the bearing.

[0006] Preferably, it further includes a connecting rod I. One end of the connecting rod I is installed in the connecting hole, and the other end of the connecting rod I is used to connect with a connecting rod III. A circular groove II is arranged along the outer side surface of the connecting rod I. The groove II and the groove I form a raceway of the bearing, and rolling elements are assembled in the raceway. The connecting rod I and the connecting arm form a bearing structure through the cooperation of the groove I, the groove II and the rolling elements.

[0007] Preferably, it further includes a cage and a sealing ring. The connecting rod I and the connecting arm form a bearing structure through the cooperation of the groove I, the groove II, the rolling elements, the cage and the sealing ring.

[0008] Preferably, the groove I is a single-groove structure or a double-groove structure. The single-groove structure is used to form a single-groove bearing structure, and the double-groove structure is used to form a double-groove bearing structure.

[0009] Preferably, the connecting rod I and the connecting arm form a full-ball type ball bearing structure through the cooperation of the groove I, the groove II and the rolling elements.

[0010] Preferably, it further includes an inner bearing ring. The inner bearing ring, the first groove and the rolling elements form a bearing structure, and it further includes a second connecting rod, which is matched with the inner bearing ring.

[0011] The head component for an embroidery machine includes the above-mentioned head cam assembly for an embroidery machine, and further includes a machine base, a guide rod, a slider, and a third connecting rod. The head cam assembly is fixedly installed on the machine base. The third connecting rod is provided with a first mounting hole, a second mounting hole, and a third mounting hole. The first mounting hole and the third mounting hole are respectively located at both ends of the third connecting rod, and the second mounting hole is located in the middle of the third connecting rod. The first connecting rod is connected to the second mounting hole. The third connecting rod is connected to the base through the first mounting hole, and the third connecting rod is connected to the slider through the third mounting hole. The slider is slidably installed on the guide rod. The cam drives the swing arm to reciprocate, the swing arm drives the third connecting rod to swing reciprocally, and the third connecting rod drives the slider to slide reciprocally along the guide rod.

[0012] This solution has the following advantages compared with the prior art. The cam mechanism and the first connecting rod form an integrated structure, which is more convenient to install. At the same time, the integrated bearing structure reduces the cumulative error of assembly, ensures the reliability of the position of the first connecting rod, and avoids the phenomenon of inclination and shaking. Moreover, the double-groove ball bearing structure enables the rotation of the first connecting rod to be more convenient, further reduces the frictional resistance, improves the side support of the first connecting rod, and ensures the coaxiality with the connecting hole of the three-eye connecting rod. Since the position of the first connecting rod is fixed, it will not have axial movement. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the cam mechanism.

[0014] Figure 2 It is a schematic diagram of the structure of the cam mechanism.

[0015] Figure 3 is Figure 2 a cross-sectional view of

[0016] Figure 4 It is a schematic diagram of the structure of the head component.

[0017] Figure 5 It is a schematic diagram of the structure of the third connecting rod.

[0018] The technical names of the reference numerals in the figure are: 1 - cam, 2 - connecting arm, 3 - connecting hole, 4 - first groove, 5 - first connecting rod, 51 - second groove, 7 - rolling element, 8 - cage, 9 - sealing ring, 10 - machine base, 11 - guide rod, 12 - slider, 13 - third connecting rod, 14 - first mounting hole, 15 - second mounting hole, 16 - third mounting hole, 17 - bushing. Detailed Embodiment

[0019] The following further describes the present invention in detail with reference to the drawings and embodiments.

[0020] Embodiment 1

[0021] The head cam assembly for an embroidery machine includes a cam 1 and a connecting arm 2 fixedly connected to the cam 1. One end of the connecting arm 2 is provided with a connecting hole 3, and further includes a first connecting rod 5 and a bearing structure. The first connecting rod 5 is installed in the connecting hole 3 through the bearing structure, and the first connecting rod 5 can rotate in the connecting hole 3 through the bearing structure.

[0022] Wherein, a circular groove 4 is formed along the inner side surface of the connecting hole 3, and the groove 4 is used as a groove for installing rolling elements 7 of the outer ring of the bearing. In this embodiment, the connecting arm 2 and the cam 1 are of an integral structure, and the connecting arm 2 is connected to the outer side surface of the outer ring of the cam 1. The connecting hole 3 is a circular shaft hole. The purpose of setting the connecting hole 3 is on the one hand to install the first connecting rod 5, and on the other hand to integrate the bearing structure. The groove 4 is used as the rolling groove of the outer ring of the bearing, and the connecting arm 2 provided with the connecting hole 3 is the outer ring of the bearing.

[0023] This embodiment further includes a first connecting rod 5, and the first connecting rod 5 in this embodiment is of a cylindrical structure. One end of the first connecting rod 5 is installed in the connecting hole 3, and the other end of the first connecting rod 5 is used to connect to the third connecting rod 13; the purpose of the connecting rod is to link the cam 1 assembly with the three - eye connecting rod, and the three - eye connecting rod is the third connecting rod 13. In this embodiment, the outer side surface of the end of the first connecting rod 5 for assembling with the connecting rod three 13 is a smooth surface. A circular groove 51 is provided along the outer side surface of the first connecting rod 5. The groove 51 and the groove 4 form the raceway of the bearing, and rolling elements 7 are assembled in the raceway. In this embodiment, the rolling elements 7 are steel balls. The first connecting rod 5 and the connecting arm 2 form a bearing structure through the cooperation of the groove 4, the groove 51, and the rolling elements 7. In this solution, the first connecting rod 5 and the connecting arm 2 are rotationally connected relative to each other through the bearing structure. Obviously, other accessories are needed to form a bearing, and no specific details are described here. The main point is that the outer ring of the bearing in this solution is replaced by the connecting arm 2, and the connecting arm 2 realizes the function of the outer ring by opening the connecting hole 3 with the groove 4.

[0024] For the convenience of understanding, this embodiment further includes a cage 8 and a sealing ring 9. The first connecting rod 5 and the connecting arm 2 form a bearing structure through the groove 4, the groove 51, the rolling elements 7, the cage 8, and the sealing ring 9.

[0025] The groove 4 is a single - groove structure or a double - groove structure. The single - groove structure is used to form a single - groove bearing structure, and the double - groove structure is used to form a double - groove bearing structure. In this embodiment, the groove 4 is a double - groove structure, and the corresponding groove 51 is also a double - groove structure, so that a double - groove ball bearing structure is formed at the connection between the first connecting rod 5 and the connecting arm 2. The double - groove ball bearing has better load - bearing capacity, smoother rotation, smaller friction, and better stability.

[0026] The present solution has the following advantages compared with the prior art. The cam 1 mechanism and the first connecting rod 5 form an integrated structure, which is more convenient to install. At the same time, the integrated bearing structure reduces the cumulative error of assembly, ensures the reliability of the position of the first connecting rod 5, and avoids tilting and shaking phenomena. Moreover, the double-groove ball bearing structure enables the rotation of the first connecting rod 5 to be more convenient, further reduces the frictional resistance, improves the lateral support of the first connecting rod 5, and ensures the coaxiality with the connecting hole 3 of the three-eye connecting rod. Since the position of the first connecting rod 5 is fixed and it will not have axial movement, there is no need to lock and fix the end for assembling with the three-eye connecting rod with a fixing bolt, which makes the installation more convenient.

[0027] Embodiment 2

[0028] The difference between this embodiment and Embodiment 1 is that the first connecting rod 5 and the connecting arm 2 form a full-ball type ball bearing structure through the cooperation of the first groove 4, the second groove 51, and the rolling elements 7.

[0029] Embodiment 3

[0030] The difference between this embodiment and Embodiment 2 is that the double-groove structure adopts a double-bearing structure, one groove adopts a full-ball type ball bearing structure, and the other groove adopts a non-full-ball type ball bearing structure with a cage.

[0031] Embodiment 4

[0032] The difference between this embodiment and Embodiment 1 is that the first groove 4 in this embodiment adopts a single-groove structure, and the formed bearing is a single-groove ball bearing.

[0033] Embodiment 5

[0034] The difference between this embodiment and Embodiment 1 is that an external thread is provided on the outer side surface of the end of the first connecting rod 5 for connecting with the third connecting rod 13, and the external thread is used to install a lock nut.

[0035] Embodiment 6

[0036] The difference between this embodiment and Embodiment 1 is that a clamping groove 52 for installing a retaining ring is provided on the outer side surface of the end of the first connecting rod 5 for connecting with the third connecting rod 13. After assembly, a retaining ring is installed in the clamping groove 53 to limit the positions of the first connecting rod 5 and the third connecting rod 13 and prevent movement or shaking.

[0037] Embodiment 7

[0038] The difference between this embodiment and Embodiment 1 is that it further includes an inner bearing ring. The inner bearing ring, the first groove 4, and the rolling elements 7 form a bearing structure. It also includes a second connecting rod, and the second connecting rod is matched with the inner bearing ring. The second connecting rod is used in the same way as the first connecting rod 5 in Embodiment 1.

[0039] Embodiment 8

[0040] The difference between this embodiment and Embodiment 1 lies in that the bearing structure includes a needle roller and a cage. The first connecting rod 5 serves as the inner ring of the bearing, and the inner wall of the connecting hole 3, the needle roller, the cage, and the outer wall of the connecting rod form a needle roller bearing structure. This solution can achieve direct matching without opening a groove in the connecting hole 3. The axial limit of the needle roller and the cage is achieved by setting a limiting structure on the first connecting rod 5.

[0041] Embodiment 9

[0042] The head component for an embroidery machine includes the head cam assembly for an embroidery machine described in the above Embodiment 1 or 2, and further includes a machine base 10, a guide rod 11, a slider 12, and a third connecting rod 13. The head cam 1 assembly is fixedly installed on the machine base 10. The third connecting rod 13 is provided with a first mounting hole 14, a second mounting hole 15, and a third mounting hole 16. The first mounting hole 14 and the third mounting hole are respectively located at both ends of the third connecting rod 13, and the second mounting hole 15 is located in the middle of the third connecting rod 13. Therefore, the third connecting rod 13 is also called a three-hole connecting rod.

[0043] Among them, the first connecting rod 5 is connected to the second mounting hole 15, and the third connecting rod 13 is connected to the base through the first mounting hole 14. Obviously, since the third connecting rod 13 is in a swinging state, the third connecting rod 13 and the base should be hinged. The third connecting rod 13 can swing relative to the base. Specifically, in this embodiment, the third connecting rod 13 is connected to a connecting shaft fixed on the base through the first mounting hole 14 to achieve hinging with the base, and the third connecting rod 13 can rotate around the connecting shaft.

[0044] The other end of the third connecting rod 13 is connected to the slider 12 through the third mounting hole 16. Since the angle between the third connecting rod 13 and the slider 12 is changing, the third connecting rod 13 and the slider 12 are also in a hinged structure. Specifically, in this embodiment, a transition rod is further provided between the third connecting rod 13 and the slider 12, and both ends of the transition rod are respectively hinged to the third connecting rod 13 and the slider 12. The slider 12 is slidably installed on the guide rod 11. The cam 1 drives the swing arm to reciprocate, the swing arm drives the third connecting rod 13 to reciprocate, and the third connecting rod 13 drives the slider 12 to reciprocate along the guide rod 11. The power source of the third connecting rod 13 is the movement drive of the first connecting rod 5.

Claims

1. The head cam assembly for an embroidery machine comprises a cam (1) and a connecting arm (2) fixedly connected to the cam (1). One end of the connecting arm (2) is provided with a connecting hole (3), and it is characterized in that: It further includes a first connecting rod (5) and a bearing structure. The first connecting rod (5) is installed in the connecting hole (3) through the bearing structure, and the first connecting rod (5) can rotate in the connecting hole (3) through the bearing structure.

2. The head cam assembly for an embroidery machine according to claim 1, wherein: An annular first groove (4) is formed along the inner side surface of the connecting hole (3). The first groove (4) is used as a groove for installing rolling elements (7) of the outer ring of the bearing. One end of the first connecting rod (5) is installed in the connecting hole (3), and the other end of the first connecting rod (5) is used to connect with the third connecting rod (13); an annular second groove (51) is provided along the outer side surface of the first connecting rod (5). The second groove (51) and the first groove (4) form the raceway of the bearing. The rolling elements (7) are assembled in the raceway. The first connecting rod (5) and the connecting arm (2) form a bearing structure through the cooperation of the first groove (4), the second groove (51), and the rolling elements (7).

3. The head cam assembly for an embroidery machine according to claim 2, characterized in that: It further includes a cage (8) and a sealing ring (9). The first connecting rod (5) and the connecting arm (2) form a bearing structure through the cooperation of the first groove (4), the second groove (51), the rolling elements (7), the cage (8), and the sealing ring (9).

4. The head cam assembly for an embroidery machine according to claim 2, wherein: The first groove (4) is a single-groove structure or a double-groove structure. The single-groove structure is used to form a single-groove bearing structure, and the double-groove structure is used to form a double-groove bearing structure.

5. The head cam assembly for an embroidery machine according to claim 2, characterized in that: The first connecting rod (5) and the connecting arm (2) form a full-ball type ball bearing structure through the cooperation of the first groove (4), the second groove (51), and the rolling elements (7).

6. The head cam assembly for an embroidery machine according to claim 1, characterized in that: On the outer side surface of the end of the first connecting rod (5) for connecting with the third connecting rod (13), an external thread is provided or a clamping groove (52) for installing a snap ring is provided on the outer side surface. Or the bearing structure includes a needle roller and a cage. The first connecting rod (5) serves as the inner ring of the bearing, and the inner wall of the connecting hole (3), the needle roller, the cage, and the outer wall of the connecting rod form a needle roller bearing structure.

7. The head cam assembly for an embroidery machine according to claim 2, characterized in that: It further includes a bearing inner ring. The bearing inner ring, the first groove (4), and the rolling elements (7) form a bearing structure. It further includes a second connecting rod, and the second connecting rod cooperates with the bearing inner ring.

8. The head component for an embroidery machine, characterized in that: It includes the head cam assembly for an embroidery machine according to any one of claims 2 to 6. It further includes a machine base (10), a guide rod (11), a slider (12), and a third connecting rod (13). The head cam (1) assembly is fixedly installed on the machine base (10). Installation holes one (14), two (15), and three (16) are provided on the third connecting rod (13). Installation hole one (14) and installation hole three are respectively located at both ends of the third connecting rod (13), and installation hole two (15) is located in the middle of the third connecting rod (13). The first connecting rod (5) is connected to installation hole two (15). The third connecting rod (13) is connected to the base through installation hole one (14). The third connecting rod (13) is connected to the slider (12) through installation hole three (16). The slider (12) is installed on the guide rod (11). The cam (1) drives the connecting arm (2) to reciprocate. The connecting arm (2) drives the third connecting rod (13) to swing reciprocally, and the third connecting rod (13) drives the slider (12) to slide reciprocally along the guide rod (11).

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