Differential matching device of presser foot and embroidery machine

Abstract

The differential matching device comprises a main shaft, a cam arranged on the main shaft, a needle bar, a presser foot sleeved on the needle bar in a sliding manner, a transmission assembly, a presser foot driving block capable of moving in a lifting manner, and an elastic piece, the transmission assembly comprises a first transmission piece with a first rotating fulcrum, and the first transmission piece is directly or indirectly movably connected with the presser foot driving block; the first transmission part is provided with a roller, and the elastic part is suitable for providing elastic force for the transmission assembly and used for keeping rolling fit between the roller and the outer cam face of the cam and enabling the second transmission part to be matched with the ascending stroke and the descending stroke of the presser foot. The utility model further discloses an embroidery machine. The beneficial effect of the utility model is that the structure is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to a differential matching device of a presser foot and an embroidery machine, belonging to the technical field of embroidery machines. Background Art

[0002] Prior art publication number CN203463587U discloses a presser foot cam transmission mechanism, comprising a thread take-up cam, a presser foot cam, a presser foot cam seat and a presser foot cam ring which are sequentially connected in series on a transmission shaft, the presser foot cam and the thread take-up cam are arranged opposite to each other on the front sides, the presser foot cam and the presser foot cam seat are fixed as a whole by bolts, and the presser foot cam seat is clamped on the transmission shaft by the presser foot cam ring.

[0003] The presser foot cam transmission mechanism is used to match the speed difference between the needle bar and the presser foot. In this patent, the roller of the presser foot connecting rod assembly is set in the cam groove of the groove cam (presser foot cam), and the groove width of the cam groove is slightly larger than the diameter of the roller, so that the roller can roll with the outer groove wall / inner groove wall of the cam groove. During operation, when the presser foot switches between descending motion and ascending motion, the rotation direction of the roller will change accordingly, so that the roller and the outer groove wall / inner groove wall will change from rolling fit to sliding fit and then to rolling fit, and the roller will jump between the outer groove wall and the inner groove wall.

[0004] Due to the internal space of the embroidery machine housing, the size of the slot cam is limited, so that the portion between the edge and the outer slot wall of the slot cam is thinner and the structural strength is weaker, and the sliding fit between the roller and the inner slot wall will cause wear and tear, and cause damage to the slot cam after long-term use. In addition, the jumping of the roller between the outer slot wall and the inner slot wall will also cause vibration during operation, thereby affecting the operating stability and causing noise. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a differential matching device of a presser foot and an embroidery machine to avoid structural damage.

[0006] The utility model is realized through the following technical solutions.

[0007] A differential matching device for a presser foot comprises a main shaft, a cam arranged on the main shaft, a needle bar, a presser foot slidably sleeved on the needle bar, a transmission assembly, a presser foot driving block that can be raised and lowered, and an elastic member; the transmission assembly comprises a first transmission member having a first rotating fulcrum, the first transmission member and the presser foot driving block are directly or indirectly movably connected; the first transmission member has a roller, and the elastic member is suitable for providing elastic force to the transmission assembly, so as to maintain the rolling matching between the roller and the outer cam surface of the cam and enable the second transmission member to match the rising and falling strokes of the presser foot.

[0008] As a further improvement of the present invention, during the descending stroke of the presser foot, the rotation direction of the first transmission member is suitable for gradually reducing the distance between the roller and the center point of the cam; during the ascending stroke of the presser foot, the rotation direction of the first transmission member is suitable for gradually increasing the distance between the roller and the center point of the cam.

[0009] As a further improvement of the utility model, one end of the elastic member acts on the first transmission member, and the other end acts on the housing directly or indirectly.

[0010] As a further improvement of the present invention, the first transmission member has a first transmission part and a second transmission part swinging around a first rotation fulcrum, the roller is arranged on the first transmission part, and the second transmission part and the presser foot driving block are directly or indirectly movably connected.

[0011] As a further improvement of the present invention, one end of the elastic member acts on the first transmission part or the second transmission part, and the other end acts on the housing directly or indirectly.

[0012] As a further improvement of the present invention, the transmission assembly also includes a second transmission member having a second rotating fulcrum, the second transmission member having a third transmission part and a fourth transmission part swinging around the second rotating fulcrum, the third transmission part and the first transmission member are directly or indirectly movably connected, and the fourth transmission part and the presser foot drive block are directly or indirectly movably connected.

[0013] As a further improvement of the present invention, one end of the elastic member acts on the third transmission part or the fourth transmission part, and the other end acts on the housing directly or indirectly.

[0014] As a further improvement of the utility model, the presser foot driving block is slidably sleeved on a vertically arranged guide rod.

[0015] As a further improvement of the present invention, the presser foot driving block has a first transmission position and a second transmission position, the first transmission position is movably connected to the fourth transmission part, and the second transmission position cooperates with the rising stroke and the descending stroke of the presser foot.

[0016] As a further improvement of the present invention, the second transmission position is provided with a shock-absorbing and noise-absorbing structure.

[0017] As a further improvement of the present invention, the stretched state of the elastic member provides elastic force to the transmission assembly.

[0018] As a further improvement of the present invention, the compressed state of the elastic member provides elastic force to the transmission assembly.

[0019] An embroidery machine comprises the differential matching device and a machine head, wherein the differential matching device is arranged in the machine head.

[0020] Beneficial effects of the utility model:

[0021] The elastic force applied by the elastic member to the transmission assembly enables the roller to always maintain a rolling fit with the outer cam surface of the cam. Since the outer cam surface is the edge surface of the cam, it has sufficient supporting strength in the rolling fit with the roller. Compared with the problem of easy damage to the groove cam in the prior art, the cam of this embodiment is obviously more durable and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a detailed description of the preferred implementation examples of the present invention through the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0023] Figure 1 It is a structural schematic diagram of the head of an embroidery machine;

[0024] Figure 2 It is a plan view of the differential coordination device in the first embodiment;

[0025] Figure 3 It is a plan view of the differential coordination device in the second embodiment;

[0026] Figure 4 It is a plan view of the differential coordination device in the third embodiment;

[0027] Figure 5 It is a plan view of the differential coordination device in the fourth embodiment. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below based on the accompanying drawings and implementation cases.

[0029] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0030] A differential speed matching device for a presser foot, arranged in the head 101 of an embroidery machine, referring to Figure 1-5 The head 101 of the embroidery machine includes a casing 102 and a needle bar frame 103. In this embodiment, the positional relationship between the needle bar frame 103 and the casing 102 is defined as a front-to-back direction relationship, that is, the needle bar frame 103 is arranged on the front side of the casing 102, and the positions on both sides of the casing 102 are a left-right direction relationship.

[0031] The differential matching device of this embodiment includes a main shaft 1, a cam 2 arranged on the main shaft 1, a needle bar 31, a presser foot 32 slidably sleeved on the needle bar 31, a transmission assembly, a presser foot driving block 5 that can be lifted and moved, and an elastic member 62. The transmission assembly includes a first transmission member 4, the first transmission member 4 has a first rotation fulcrum 4a, so that the first transmission member 4 can rotate around the first rotation fulcrum 4a, and the first transmission member 4 and the presser foot driving block are directly or indirectly movably connected.

[0032] The first transmission member 4 has a roller 61, and the elastic member 62 applies elastic force to the transmission assembly to maintain the rolling cooperation between the roller 61 and the outer cam surface 2 of the cam 2 and make the presser foot driving block 5 cooperate with the rising and falling strokes of the presser foot 32. The rolling cooperation between the roller 61 and the outer cam surface 2 of the cam 2 makes the presser foot driving block 5 cooperate with the rising stroke of the presser foot 32. During this process, when the needle bar 31 is at the lowest position and the presser foot 32 is pressed on the embroidery cloth, when the needle bar 31 moves upward, the presser foot driving block 5 applies force to the presser foot 32 and drives the presser foot 32 to rise a certain distance to reduce the speed difference between the presser foot 32 and the needle bar 31. Since the moving speed of the needle bar 31 is greater than that of the presser foot 32, the needle clamp 311 of the needle bar 31 finally presses against the presser foot 32 and drives the presser foot 32 to move upward, and the presser foot driving block 5 and the presser foot 32 are separated.

[0033] The roller 61 and the outer cam surface 2 of the cam 2 roll in cooperation so that the presser foot driving block 5 cooperates with the descending stroke of the presser foot 32. During this process, as the needle bar 31 moves downward from the highest position, the needle bar 31 drives the presser foot 32 to move downward through the action of the compression spring 312 that supports the needle bar 31 and the presser foot 32. When the presser foot 32 descends a certain distance and approaches the embroidery cloth, the presser foot driving block 5 applies force to the presser foot 32 and continuously reduces the speed of the presser foot 32 until the presser foot 32 presses the embroidery cloth.

[0034] The elastic force applied by the elastic member 62 to the transmission assembly allows the roller 61 to always maintain rolling cooperation with the outer cam surface 2 of the cam 2. Since the outer cam surface 2 is the edge surface of the cam 2, it has sufficient support strength when rolling with the roller 61. Compared with the problem of the slot cam 2 being easily damaged in the prior art, the cam 2 of this embodiment is obviously more durable and has a longer service life. Compared with the situation in the prior art where the roller 61 jumps back and forth between the outer groove wall and the outer groove wall of the slot cam 2, in this embodiment, since the roller 61 maintains a fit state with the outer cam surface 2, it can reduce vibration during operation, improve operation stability and reduce noise. Since the roller 61 always maintains a rolling fit with the outer cam surface 2 of the cam 2, the rolling direction of the roller 61 will not change, that is, the situation in the prior art where the rolling direction of the roller 61 changes (the roller 61 switches between clockwise and counterclockwise rotation), thereby causing the roller 61 and the outer groove wall / inner groove wall to change from a rolling fit to a sliding fit and causing wear, can further improve the service life of the cam 2. In addition, compared with the prior art where the diameter of the roller 61 is limited by the groove width of the cam 2 groove, in this embodiment, since the roller 61 is located outside the cam 2, the diameter setting of the roller 61 is less restricted, and the rotation speed of the roller 61 can be reduced by increasing the diameter of the roller 61, thereby reducing the hardware loss of the roller 61 and the cam 2.

[0035] It should be noted that when assembling the transmission component, since the transmission component is provided with an elastic member 62, there is no need to assemble the first transmission member 4 on the housing 102 with the roller 61 tightly against the outer cam 2 surface of the cam 2. The first transmission member 4 can be assembled with the roller 61 separated from the outer cam 2 surface of the cam 2 by stretching or compressing the elastic member 62. After the assembly is completed, the elastic member 62 is released. The elastic member 62 drives the first transmission member 4 to rotate under the action of its elastic force, so that the roller 61 remains in contact with the outer cam 2 surface of the cam 2. On the one hand, the difficulty of assembly can be reduced, especially in the case of a small installation space in the housing 102. On the other hand, due to the presence of the elastic member 62, the contact state of the roller 61 can be maintained by the elastic force, so that the processing accuracy requirements of the roller 61 and the cam 2 are relatively reduced.

[0036] In this embodiment, the rotation direction of the first transmission member 4 changes once during a complete ascending and descending stroke of the presser foot 32, and the rotation direction of the first transmission member 4 makes the distance between the roller 61 and the rotation center of the cam 2 gradually decrease during the descending stroke of the presser foot 32. During the descending stroke of the presser foot 32, since the presser foot driving block 5 needs to support the presser foot 32 and slow down the moving speed of the presser foot 32, the force load strength of the presser foot driving block 5 is relatively high, especially the impact effect received at the moment when the presser foot driving block 5 undertakes to support the presser foot 32 will strengthen the descending trend of the presser foot driving block 5 and the rotation trend of the first transmission member 4. Since the distance between the roller 61 and the rotation center of the cam 2 gradually decreases during the descending formation of the presser foot 32, the roller 61 tends to be close to the outer cam 2 surface of the cam 2 under the impact of the presser foot driving block 5, thereby preventing the roller 61 from being separated from the outer cam 2 surface of the cam 2, thereby improving the stability of the differential matching operation. Correspondingly, during the rising stroke of the presser foot 32, the distance between the roller 61 and the rotation center of the cam 2 gradually increases in the rotation direction of the first transmission member 4. During this process, the force load strength of the presser foot driving block 5 is relatively low, and the roller 61 has a tendency to move away from the outer cam surface of the cam 2. The roller 61 is kept in contact with the outer cam surface of the cam 2 by the elastic action of the elastic member 62.

[0037] Regarding the setting of the elastic member 62, in one embodiment, the first transmission member 4 is provided with at least one elastic member 62, one end of the elastic member 62 acts on the first transmission member 4, and the other end acts on the housing 102, and can also act on a structure installed on the housing 102, so that the other end of the elastic member 62 directly or indirectly acts on the housing 102.

[0038] The elastic force of the elastic member 62 may be a tensile force, that is, the elastic member 62 in a tensile state provides an elastic force to the transmission assembly, and the elastic member 62 is preferably set as a tension spring. The elastic force of the elastic member 62 may also be a compressive force, that is, the elastic member 62 in a compressed state provides an elastic force to the transmission assembly, and the elastic member 62 is preferably set as a compression spring. The two ends of the elastic member 62 act on the housing 102 and the first transmission member 4 respectively, and may be directly connected, or, for example, a structure for mounting or connecting the elastic member 62 may be set on the first transmission member 4, and the same is true for the structure on the housing 102 or mounted on the housing 102.

[0039] For the first transmission member 4, in one embodiment, the first transmission member 4 has a first transmission part 41 and a second transmission part 42, and the first transmission part 41 and the second transmission part 42 swing around the first rotation fulcrum 4a. The roller 61 is arranged on the first transmission part 41, and the second transmission part 42 is movably connected to the presser foot driving block 5, or a transmission member (hereinafter referred to as the second transmission member 7) that movably connects the second transmission part 42 and the presser foot driving block 5 is arranged between the second transmission part 42 and the presser foot driving block 5, so that the second transmission part 42 is directly or indirectly movably connected to the presser foot driving block 5. One end of the elastic member 62 acts on the first transmission part 41 (refer to Figure 2 ) or the second transmission part 42 (refer to Figure 3 ), and the other end acts on the housing 102 directly or indirectly.

[0040] In this embodiment, the transmission assembly also includes a second transmission member 7 having a second rotating fulcrum 7a, the second transmission member 7 has a third transmission part 71 and a fourth transmission part 72 that swing around the second rotating fulcrum 7a, the third transmission part 71 and the first transmission member are directly or indirectly movably connected, and the fourth transmission part 72 and the presser foot drive block 5 are directly or indirectly movably connected.

[0041] Regarding the arrangement of the elastic member 62, in another embodiment, the second transmission member 5 is provided with at least one elastic member 62, one end of which acts on the third transmission part 71 (refer to Figure 4 ) or the fourth transmission part 72 (refer to Figure 5 ), and the other end acts on the casing directly or indirectly.

[0042] Regarding the setting of the presser foot driving block 5, in the present embodiment, a vertical guide rod 53 is provided in the housing 102, and the presser foot driving block 5 is slidably sleeved on the guide rod 53, so that the presser foot driving block 5 can reciprocate vertically. During the lifting process, the presser foot driving block 5 is subjected to a large force from the guide rod 53, resulting in a large friction resistance. Lubricating oil is needed to reduce the friction to avoid the presser foot driving block 5 from getting stuck when it is lifted or lowered.

[0043] In this embodiment, the presser foot driving block 5 has a first transmission position 51 and a second transmission position 52. The second transmission position 52 cooperates with the rising stroke and the falling stroke of the presser foot 32, and the second transmission position 52 is provided with a shock-absorbing and noise-reducing structure, so that the vibration and noise can be reduced when cooperating with the rising stroke and the falling stroke of the presser foot 32. The presser foot driving block 5 may be provided with a movable connecting rod, and the end of the pulling rod forms the first transmission position 51.

[0044] It should be noted that the first transmission member 4 and the second transmission member 5 can be directly movably connected or indirectly movably connected, that is, a connection structure that movably connects the first transmission member 4 and the second transmission member 5 is provided between the first transmission member 4 and the second transmission member 5, and the connection structure is regarded as a part of the first transmission member 4 or the second transmission member 5. The elastic member 62 is provided on the connection structure, which is equivalent to the elastic member 62 being provided on the first transmission member 4 or the second transmission member 5. In addition, the elastic member 62 can also act on the roller 61. Since the roller 61 is provided on the first transmission member 4, in this case, the elastic member 62 is also regarded as being provided on the first transmission member 4.

[0045] There is another implementation method for disposing the elastic member 62. The transmission member 4 and the transmission member 5 are each provided with at least one elastic member 62. The disposition method is as described above and will not be repeated here.

[0046] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation cases of the utility model.

Claims

1. A differential matching device for a presser foot, characterized in that: It includes a main shaft, a cam arranged on the main shaft, a needle bar, a presser foot slidably sleeved on the needle bar, a transmission assembly, a presser foot driving block that can be raised and lowered, and an elastic member; the transmission assembly includes a first transmission member with a first rotating fulcrum, and the first transmission member and the presser foot driving block are directly or indirectly movably connected; the first transmission member has a roller, and the elastic member applies an elastic force to the transmission assembly to maintain the rolling fit between the roller and the outer cam surface of the cam and enable the presser foot driving block to cooperate with the rising and falling strokes of the presser foot.

2. The differential speed matching device of the presser foot according to claim 1, characterized in that: During the descending stroke of the presser foot, the rotation direction of the first transmission member is suitable for gradually reducing the distance between the rotation center of the roller and the cam; during the ascending stroke of the presser foot, the rotation direction of the first transmission member is suitable for gradually increasing the distance between the roller and the rotation center of the cam.

3. The differential speed matching device of the presser foot according to claim 1, characterized in that: The first transmission member is provided with at least one elastic member, one end of the elastic member acts on the first transmission member, and the other end of the elastic member acts on the housing directly or indirectly.

4. The differential speed matching device of the presser foot according to claim 1, characterized in that: The transmission assembly also includes a second transmission member having a second rotation fulcrum. The second transmission member is provided with at least one elastic member. One end of the elastic member acts on the second transmission member, and the other end acts on the housing directly or indirectly.

5. The differential speed matching device of the presser foot according to claim 4, characterized in that: The first transmission member and the second transmission member are both provided with at least one elastic member, one end of the elastic member provided on the first transmission member acts on the first transmission member, and the other end acts on the housing directly or indirectly, and one end of the elastic member provided on the second transmission member acts on the second transmission member, and the other end acts on the housing directly or indirectly.

6. The differential speed matching device of the presser foot according to claim 3, characterized in that: The first transmission member comprises a first transmission part and a second transmission part which swing around a first rotation fulcrum, the roller is arranged on the first transmission part, and the second transmission part is directly or indirectly movably connected to the presser foot driving block.

7. The differential speed matching device of the presser foot according to claim 6, characterized in that: One end of the elastic member acts on the first transmission part or the second transmission part, and the other end acts on the housing directly or indirectly.

8. The differential speed matching device of the presser foot according to claim 4, characterized in that: The second transmission member comprises a third transmission part and a fourth transmission part which swing around a second rotation fulcrum, the third transmission part is movably connected to the first transmission member, and the fourth transmission part is movably connected to the presser foot driving block.

9. The differential speed matching device of the presser foot according to claim 8, characterized in that: One end of the elastic member acts on the third transmission part or the fourth transmission part, and the other end acts on the housing directly or indirectly.

10. The differential speed matching device of the presser foot according to claim 8, characterized in that: The presser foot driving block is slidably sleeved on a vertically arranged guide rod.

11. The differential speed matching device of the presser foot according to claim 8, characterized in that: The presser foot driving block has a first transmission position and a second transmission position, the first transmission position is connected to the fourth transmission part, and the second transmission position cooperates with the rising stroke and the falling stroke of the presser foot.

12. The differential speed matching device of the presser foot according to claim 11, characterized in that: The second transmission position is provided with a shock absorbing and noise absorbing structure.

13. The differential speed matching device of the presser foot according to any one of claims 1 to 12, characterized in that: The stretched state of the elastic member provides elastic force to the transmission assembly.

14. The differential speed matching device of the presser foot according to any one of claims 1 to 12, characterized in that: The compressed state of the elastic member provides elastic force to the transmission assembly.

15. An embroidery machine, characterized in that: It comprises the differential matching device and a machine head as described in any one of claims 1 to 14, wherein the differential matching device is arranged in the machine head.

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