Double-needle driving mechanism, double-needle machine head and embroidery machine

Abstract

The utility model discloses a double needle drive mechanism, comprising: a main shaft, on which an eccentric cam is arranged; two vertically arranged guide rods, on which a needle bar driver and a presser foot driver are slidably sleeved; a needle bar drive connecting rod assembly, which is transmission-connected to the eccentric cam and the two needle bar drivers, and is used to drive the two needle bar drivers to synchronously lift and reciprocate, and the needle bar drive connecting rod assembly is located in the middle of the two guide rods to balance the stress conditions of the two needle bar drivers; a presser foot connecting rod assembly, which is transmission-connected to the needle bar driver and the presser foot driver on the same guide rod, and is used to drive the presser foot driver to lift and reciprocate. The utility model also discloses a double needle machine head and an embroidery machine. The beneficial effect of the utility model is that the stress conditions of the two needle bar drivers are balanced, and the embroidery quality is improved.

Description

Technical Field

[0001] The utility model relates to a double-needle driving mechanism, a double-needle machine head and an embroidery machine, and is applied in the technical field of embroidery machines. Background Art

[0002] At present, in the embroidery machine industry, in order to improve the efficiency of embroidery, a double-needle machine head is designed to match. The double-needle machine head can drive two needle bars at the same time to embroider. The needle bars are driven by the needle bar driver to move back and forth. The double-needle machine head is driven by the main shaft, and the two needle bar drivers are driven to move back and forth through the needle bar driving connecting rod assembly. In the prior art, due to the setting position and composition structure of the needle bar driving connecting rod assembly, there is a difference in the force arm generated by the force of the two needle bar drivers, which leads to inconsistent force conditions of the two needle bar drivers, which in turn affects the stability of the synchronous embroidery of the two needle bars. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a double-needle driving mechanism, a double-needle machine head and an embroidery machine, which balance the stress conditions of two needle bar drivers and improve the stability of synchronous embroidery.

[0004] The utility model is realized through the following technical solutions.

[0005] A double-needle drive mechanism, comprising:

[0006] A main shaft, wherein an eccentric cam is provided on the main shaft;

[0007] Two vertically arranged guide rods, each of which is slidably sleeved with a needle bar driver and a presser foot driver;

[0008] The needle bar driving connecting rod assembly is connected to the eccentric cam and the two needle bar drivers, and is used to drive the two needle bar drivers to synchronously lift and reciprocate. The needle bar driving connecting rod assembly is located in the middle of the two guide rods to balance the force conditions of the two needle bar drivers.

[0009] The presser foot connecting rod assembly is transmission-connected to the needle bar driver and the presser foot driver on the same guide rod, and is used to drive the presser foot driver to move up and down and reciprocate.

[0010] As a further improvement of the present invention, the needle bar drive connecting rod assembly includes a first needle bar drive connecting rod, a second needle bar drive connecting rod, and two third needle bar drive connecting rods; the two ends of the first needle bar drive connecting rod are respectively rotationally connected to the eccentric cam and the middle part of the second needle bar drive connecting rod, one end of the second needle bar drive connecting rod is directly or indirectly rotationally connected to the casing, the two sides of the other end of the second needle bar drive connecting rod are respectively rotationally connected to one end of the two third connecting rods, and the other ends of the two third connecting rods are respectively rotationally connected to the corresponding needle bar drivers.

[0011] As a further improvement of the present invention, a avoidance groove is provided in the middle of the second needle bar driving connecting rod, and sockets are provided on the left and right groove walls of the avoidance groove. One end of the first needle bar driving connecting rod extends into the avoidance groove, and connecting shafts connected to the corresponding sockets are provided on both sides thereof.

[0012] As a further improvement of the present invention, the first needle bar driving connecting rod has a first transmission part rotatably connected to the eccentric cam, and the third needle bar driving connecting rod has two second transmission parts rotatably connected to the corresponding needle bar drivers, and the force arm lengths from the first transmission part to the two second transmission parts are basically the same.

[0013] As a further improvement of the utility model, two guide assemblies are further included, which act on the two presser foot drivers respectively, and are used to prevent the presser foot drivers from rotating circumferentially around the guide rod when the presser foot drivers are in lifting and reciprocating motion.

[0014] As a further improvement of the present invention, the guide assembly includes a guide component and a guide element, the guide component extends in a straight line and is parallel to the guide rod, the guide element is movably connected to the guide component and can move along the guide component, and the guide component or the guide element is arranged on the presser foot driver.

[0015] As a further improvement of the present invention, the guide component has a slide groove extending along its length direction, and the guide element is movably connected to the slide groove and can move along the slide groove.

[0016] As a further improvement of the present invention, the guide element and the guide component are slidably matched.

[0017] As a further improvement of the present invention, the guide element and the guide component are in rolling cooperation.

[0018] As a further improvement of the present invention, the length of the guide component is not less than the stroke distance of the presser foot driver.

[0019] As a further improvement of the present invention, the guide element is arranged on the presser foot connecting rod assembly, and the guide component is directly or indirectly arranged on the casing.

[0020] As a further improvement of the present invention, the two guide components are respectively arranged on the outsides of the two guide rods, and the sliding grooves of the two guide components are arranged opposite to each other.

[0021] As a further improvement of the utility model, the presser foot connecting rod assembly includes a first presser foot connecting rod, a second presser foot connecting rod, and a third presser foot connecting rod; the two ends of the first presser foot connecting rod are respectively rotatably connected to the needle bar driver and the middle part of the second presser foot connecting rod, one end of the second presser foot connecting rod is directly or indirectly rotatably connected to the casing, the other end of the second presser foot connecting rod is rotatably connected to one end of the third presser foot connecting rod, the other end of the third presser foot connecting rod is rotatably connected to a connecting shaft, one end of the connecting shaft is connected to the presser foot driver, and the other end is provided with the guide element.

[0022] A double-needle machine head comprises a casing, a double-needle driving mechanism and a needle bar frame; the double-needle driving mechanism is arranged in the casing, the needle bar frame is arranged on the front side of the casing, and the needle bar driven by the needle bar driver and the presser foot differentially matched by the presser foot driver are arranged on the needle bar frame.

[0023] An embroidery machine comprises the double-needle machine head.

[0024] Beneficial effects of the utility model:

[0025] Since the needle bar drive connecting rod assembly is arranged in the middle position of the two guide rods, the needle bar drive connecting rod assembly and the two needle bar drivers form a whole which is symmetrical in structure, thereby balancing the stress conditions of the two needle bar drivers, so that the two needle bar drivers maintain the same lifting and reciprocating movement state, thereby ensuring the stability of double-needle synchronous embroidery. In addition, since the presser foot driver is driven by the needle bar driver to drive the presser foot transmission connecting rod assembly, the two presser foot drivers can also maintain the same lifting and reciprocating movement state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following is a detailed description of the preferred implementation examples of the present invention with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0027] Figure 1 A schematic diagram of a double needle drive mechanism and a housing for implementing Example 1;

[0028] Figure 2 is a schematic diagram of a double-needle drive mechanism of implementation case 1;

[0029] Figure 3 A schematic diagram of a needle bar drive connecting rod assembly according to Example 1;

[0030] Figure 4 It is a disassembly diagram of the first needle bar driving connecting rod and the second needle bar driving connecting rod of the implementation case 1;

[0031] Figure 5 A schematic diagram of a presser foot connecting rod assembly according to Example 1;

[0032] Figure 6is a schematic diagram of a guide assembly for implementing Case 1;

[0033] Figure 7 Schematic diagram of the double-needle handpiece for implementing Case 2. DETAILED DESCRIPTION

[0034] The utility model is further described in detail below based on the accompanying drawings and implementation cases.

[0035] 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.

[0036] Implementation Case 1:

[0037] A double needle drive mechanism, referring to Figure 1-6 It includes a main shaft 3, two guide rods 11, two needle bar drivers 111, two presser foot drivers 112, a needle bar drive connecting rod assembly 12, and two presser foot connecting rod assemblies 13.

[0038] Among them, the main shaft 3 passes through the casing 1 horizontally in the left-right direction, and an eccentric cam 31 is arranged on the main shaft 3. Two guide rods 11 are vertically arranged in the casing 1 and spaced apart in the left-right direction. A needle bar driver 111 and a presser foot driver 112 are slidably connected on each guide rod 11. The needle bar driver 111 is located above the presser foot driver 112. Both of them can slide along the guide rod 11, thereby respectively driving the needle bar and the presser foot to reciprocate in the vertical direction.

[0039] The needle bar driving link assembly 12 is connected to the eccentric cam 31 and the two needle bar drivers 111. Under the drive of the main shaft 3, the two needle bar drivers 111 can be driven to move vertically back and forth along the guide rod 11 through the eccentric cam 31 and the needle bar driving link assembly 12. The needle bar driving link assembly 12 is arranged in the middle of the two guide rods 11 to balance the stress conditions of the two needle bar drivers 111. The presser foot driving link assembly is connected to the needle bar driver 111 and the presser foot driver 112 on the same guide rod 11, thereby driving the presser foot driver 112 to move up and down and back and forth along the guide rod 11.

[0040] The double needle drive mechanism of this embodiment is applied in an embroidery machine for double needle embroidery, and can simultaneously drive two needle bar drivers 111 to move up and down and back and forth through the needle bar drive link assembly 12, thereby driving the two needle bars to embroider simultaneously. In this embodiment, since the needle bar drive link assembly 12 is arranged in the middle position of the two guide bars 11, the whole formed by the needle bar drive link assembly 12 and the two needle bar drivers 111 is structurally symmetrical, thereby balancing the stress conditions of the two needle bar drivers 111, so that the two needle bar drivers 111 maintain the same lifting and reciprocating state, thereby ensuring the stability of the double needle embroidery, in addition, since the presser foot driver 112 is driven by the needle bar driver 111 and the presser foot transmission link assembly, the two presser foot drivers 112 can also maintain the same lifting and reciprocating state.

[0041] In this embodiment, the needle bar driving link assembly 12 includes a first needle bar driving link 121, a second needle bar driving link 122, and two third needle bar driving links 123. Among them, the two ends of the first needle bar driving link 121 are respectively rotatably connected to the eccentric cam 31 and the middle part of the second needle bar driving link 122, and one end of the first needle bar driving link 121 that is transmission-connected to the eccentric cam 31 has a large collar structure and is rotationally sleeved on the eccentric cam 31. One end of the second needle bar driving link 122 is directly or indirectly rotationally connected to the housing 1, and the two sides of the other end of the second needle bar driving link 122 are respectively rotationally connected to one end of the two third links, and the other ends of the two third links are respectively rotationally connected to the corresponding needle bar driver 111. The needle bar driving link assembly 12 of this embodiment is transmission-connected to the two needle bar drivers 111 through a three-link structure of a symmetrical structure, thereby driving the lifting and reciprocating motion of the needle bar driver 111.

[0042] In this embodiment, the first needle bar driving link 121 has a first transmission part 12a for rotating the eccentric cam 31, and the third needle bar driving link 123 has a second transmission part 12b for rotating and connecting the corresponding needle bar driver 111. The length of the force arm from the first transmission part 12a to the two second transmission parts 12b is the same, so that the eccentric cam 31 and the first needle bar driving link 121 are located in the middle position of the two guide rods 11, thereby balancing the force conditions of the two needle bar drivers 111.

[0043] In this embodiment, a shunting groove 1221 is provided in the middle of the second needle bar driving link 122, and the left and right groove walls of the shunting groove 1221 are provided with plug holes 1222. One end of the first needle bar driving link 121 extends into the shunting groove 1221, and the two sides thereof are provided with connecting shafts 1211 connected to the corresponding plug holes 1222, and the outer sleeve of the connecting shaft 1211 is connected with bearings 1212 to improve the rotation performance. By providing the shunting groove 1221 and the plug holes 1222 on the left and right groove walls of the shunting groove 1221, the first needle bar driving link 121 can be rotatably connected with the second needle bar driving link 122, and the first needle bar driving link 121 and the second needle bar driving link 122 are ensured to be located in the middle of the two guide rods 11, so that the whole formed by the needle bar driving link assembly 12 and the two needle bar drivers 111 is symmetrical in structure, so as to balance the stress conditions of the two needle bar drivers 111. In addition, by providing the avoidance groove 1221 , the space occupied by the first needle bar driving link 121 and the second needle bar driving link 122 can be compressed, thereby optimizing the internal space layout of the casing 1 .

[0044] The double needle drive mechanism of this embodiment also includes a guide assembly, two of which are provided, acting on the two presser foot drivers 112 respectively, and are used to prevent the presser foot driver 112 from rotating circumferentially around the guide rod 11 when the presser foot driver 112 moves up and down and reciprocates. The structural damage to the presser foot transmission connecting rod assembly caused by the circumferential rotation of the presser foot driver 112 can be avoided. Therefore, the guide assembly can ensure the state stability of the presser foot driver 112 when it moves up and down and reciprocates along the guide rod 11, thereby extending its service life.

[0045] In this embodiment, the guide assembly includes a guide component 142 and a guide element 141. The guide component 142 extends in a straight line and is parallel to the guide rod 11, that is, moves in a direction parallel to the guide rod 11. The guide element 141 is movably connected to the guide component 142 and can move along the guide component 142. The guide component 142 or the guide element 141 is arranged on the presser foot driver 112. The matching relationship between the guide component 142 and the guide element 141 enables the two to play a vertical guiding role with each other and restricts the relative movement of the two in the lateral direction. Therefore, one of the two is arranged on the presser foot driver 112, and the vertical guidance of the two is adapted to the lifting and reciprocating movement of the presser foot driver 112, and the lateral movement restriction can effectively prevent the presser foot driver 112 from rotating in the circumferential direction.

[0046] In this embodiment, the length of the guide component 142 is not less than the travel distance of the presser foot driver 112 to prevent the guide component 142 and the guide element 141 from being separated or stuck during the vertical reciprocating motion of the presser foot driver 112.

[0047] As for the specific structural arrangement of the guide component 142 , in the present embodiment, the guide component 142 has a slide groove 1421 extending along its length direction, and the guide element 141 and the slide groove 1421 are movably connected and can slide along the slide groove 1421 .

[0048] Regarding the specific setting of the movable connection relationship between the guide element 141 and the guide component 142, in one embodiment, the guide element 141 and the guide component 142 are slidably matched, the guide component 142 is provided with a slide groove 1421, and the guide member is a rigid structure, inserted in the slide groove 1421 and can slide along the slide groove 1421, that is, the sliding match between the guide element 141 and the guide component 142 is achieved. The sliding match relationship structure is simple to set, but it will generate a certain amount of friction. Under the condition of high-speed reciprocating motion of the presser foot driver 112, it will cause large friction loss and easy damage.

[0049] In another embodiment, the guide element 141 and the guide component 142 are in rolling cooperation, the guide component 142 is provided with a slide groove 1421, the guide member is provided as a rolling member, specifically, a bearing, the guide member is provided in a rolling manner in the slide groove 1421 and can roll along the slide groove 1421, thus achieving rolling cooperation between the guide element 141 and the guide component 142. Compared with sliding cooperation, rolling cooperation has less friction loss and is more suitable for the application condition of high-speed reciprocating motion of the presser foot driver 112.

[0050] In this embodiment, the guide element 141 is arranged on the presser foot connecting rod assembly 13, and the two guide components 142 are arranged on the outside of the two guide rods 11, and the guide components 142 are directly or indirectly arranged on the housing 1. The guide element 141 is arranged on the presser foot connecting rod assembly 13, which can simplify the structure and facilitate the space layout.

[0051] In this embodiment, the two guide components 141 are respectively arranged on the outsides of the two guide rods 11, and the sliding grooves 1421 of the two guide components 141 are arranged opposite to each other.

[0052] More specifically, the presser foot connecting rod assembly 13 includes a first presser foot connecting rod 131, a second presser foot connecting rod 132, and a third presser foot connecting rod 133. The two ends of the first presser foot connecting rod 131 are rotatably connected to the needle bar driver 111 and the middle part of the second presser foot connecting rod 132, one end of the second presser foot connecting rod 132 is directly or indirectly rotatably connected to the housing 1, the other end of the second presser foot connecting rod 132 is rotatably connected to one end of the third presser foot connecting rod 133, the other end of the third presser foot connecting rod 133 is rotatably connected to a connecting shaft 1331, one end of the connecting shaft 1331 is connected to the presser foot driver 112, and the other end is provided with a guide element 141.

[0053] Implementation Case 2:

[0054] A double needle machine head, referring to Figure 7 Combined with Figure 1-6 , including a housing 1, a double needle driving mechanism, and a needle bar frame 2. The double needle driving mechanism is as shown in Example 1. The double needle driving mechanism is arranged in the housing 1, and the needle bar frame 2 is arranged on the front side of the housing 1. The needle bar frame 2 is provided with a needle bar 21 driven by a needle bar driver 111 and a presser foot 22 matched with a presser foot driver 112 at a differential speed.

[0055] Implementation Case 3:

[0056] An embroidery machine includes a double-needle machine head, and the double-needle machine head is shown in Implementation Case 2.

[0057] 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 double needle drive mechanism, characterized in that: include: A main shaft, wherein an eccentric cam is provided on the main shaft; Two vertically arranged guide rods, each of which is slidably sleeved with a needle bar driver and a presser foot driver; A needle bar driving connecting rod assembly is drivingly connected to the eccentric cam and the two needle bar drivers, and is used to drive the two needle bar drivers to synchronously lift and reciprocate, and the needle bar driving connecting rod assembly is located in the middle of the two guide rods; The presser foot connecting rod assembly is transmission-connected to the needle bar driver and the presser foot driver on the same guide rod, and is used to drive the presser foot driver to move up and down and reciprocate.

2. The double needle drive mechanism according to claim 1, characterized in that: The needle bar driving connecting rod assembly includes a first needle bar driving connecting rod, a second needle bar driving connecting rod, and two third needle bar driving connecting rods; the two ends of the first needle bar driving connecting rod are respectively rotatably connected to the eccentric cam and the middle part of the second needle bar driving connecting rod, one end of the second needle bar driving connecting rod is directly or indirectly rotatably connected to the casing, the two sides of the other end of the second needle bar driving connecting rod are respectively rotatably connected to one end of the two third connecting rods, and the other ends of the two third connecting rods are respectively rotatably connected to the corresponding needle bar drivers.

3. The double needle drive mechanism according to claim 2, characterized in that: A avoidance groove is provided in the middle of the second needle bar driving connecting rod, and sockets are provided on the left and right groove walls of the avoidance groove. One end of the first needle bar driving connecting rod extends into the avoidance groove, and connecting shafts connected to the corresponding sockets are provided on both sides thereof.

4. The double needle drive mechanism according to claim 2 or 3, characterized in that: The first needle bar driving connecting rod has a first transmission part rotatably connected to the eccentric cam, and the third needle bar driving connecting rod has two second transmission parts rotatably connected to the corresponding needle bar drivers, and the force arm lengths from the first transmission part to the two second transmission parts are basically the same.

5. The double needle drive mechanism according to claim 1, characterized in that: It also includes two guide assemblies, which act on the two presser foot drivers respectively and are used to prevent the presser foot drivers from rotating circumferentially around the guide rod when the presser foot drivers move up and down and reciprocate.

6. The double needle drive mechanism according to claim 5, characterized in that: The guide assembly comprises a guide component and a guide element. The guide component extends in a straight line and is parallel to the guide rod. The guide element is movably connected to the guide component and can move along the guide component. The guide component or the guide element is arranged on the presser foot driver.

7. The double needle drive mechanism according to claim 6, characterized in that: The guide component has a slide groove extending along its length direction, and the guide element is movably connected to the slide groove and can move along the slide groove.

8. The double needle drive mechanism according to claim 6, characterized in that: The guide element and the guide component are slidably matched.

9. The double needle drive mechanism according to claim 6, characterized in that: The guide element and the guide component are in rolling cooperation.

10. The double needle drive mechanism according to claim 6, characterized in that: The length of the guide component is not less than the stroke distance of the presser foot driver.

11. The double needle drive mechanism according to claim 7, characterized in that: The guide element is arranged on the presser foot connecting rod assembly, and the guide component is directly or indirectly arranged on the casing.

12. The double needle drive mechanism according to claim 11, characterized in that: The two guide components are respectively arranged on the outsides of the two guide rods, and the sliding grooves of the two guide components are arranged opposite to each other.

13. The double needle drive mechanism according to claim 11, characterized in that: The presser foot connecting rod assembly includes a first presser foot connecting rod, a second presser foot connecting rod, and a third presser foot connecting rod; the two ends of the first presser foot connecting rod are respectively rotatably connected to the needle bar driver and the middle part of the second presser foot connecting rod, one end of the second presser foot connecting rod is directly or indirectly rotatably connected to the casing, the other end of the second presser foot connecting rod is rotatably connected to one end of the third presser foot connecting rod, the other end of the third presser foot connecting rod is rotatably connected to a connecting shaft, one end of the connecting shaft is connected to the presser foot driver, and the other end is provided with the guide element.

14. A double needle machine head, characterized in that: It includes a casing, the double needle drive mechanism according to any one of claims 1 to 13, and a needle bar frame; the double needle drive mechanism is arranged in the casing, the needle bar frame is arranged on the front side of the casing, and the needle bar driven by the needle bar driver and the presser foot differentially matched by the presser foot driver are arranged on the needle bar frame.

15. An embroidery machine, characterized in that: Includes the double-needle handpiece of claim 14.

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