Machine needle blowing device and sewing equipment

Abstract

The utility model discloses a machine needle blowing device and sewing equipment. The machine needle blowing device comprises a driving cam, a piston rod, a blowing assembly and a connecting rod assembly, wherein the driving cam is rotatably arranged; the piston rod is arranged in a compressed air chamber in a sliding manner; when the driving cam rotates, the piston rod extrudes the compressed air chamber through the connecting rod assembly, and air exhausted by the compressed air chamber is blown to the machine needle through the air blowing assembly. The driving cam is connected with the piston rod through the connecting rod assembly instead of directly abutting against the piston rod, abrasion does not exist between the driving cam and the piston rod, the motion stroke of the piston rod is natural and not affected by abrasion, the motion stroke of the piston rod is stable, and the volume of gas blown to the blowing assembly by the compression gas chamber each time is kept unchanged. The air blowing amount of the air blowing assembly to the machine needle is not changed, the cooling performance is stable, and the cooling effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing equipment, in particular to a needle air blowing device and sewing equipment. Background Art

[0002] Sewing equipment is divided into bar tacking machines, button sewing machines, buttonhole machines and overlock machines according to the purpose of stitches. Taking the bar tacking machine as an example, the shuttle rotates under the drive of the upper shaft, and the bobbin of the shuttle is wound with the bottom thread. The needle bar and the shuttle cooperate to interweave the upper thread supplied to the needle and the bottom thread supplied by the bobbin, forming stitches on the fabric. When the upper shaft rotates at high speed, the needle bar moves up and down at high speed, and the needle at the lower end of the needle bar repeatedly rubs against the fabric, causing the needle to heat up. Long-term operation will damage the fabric and stitches, and even cause the fabric to melt and the upper and bottom threads to break. Therefore, it is particularly important to cool the needle.

[0003] Existing cooling devices use air blowing to cool the needle. However, in the needle cooling device provided by the patent with publication number CN215481682U, the piston rod of the needle cooling device directly contacts the cam, and the cam drives the piston rod to move up and down by rotating. However, the cam rotates at high speed along with the upper shaft for a long time, which will cause serious wear between the cam and the piston rod, seriously affecting the stroke of the piston rod, and then affecting the air blowing volume of the needle cooling device, resulting in unstable cooling performance and poor cooling effect. Utility Model Content

[0004] The utility model aims to provide a needle blowing device and sewing equipment, which drives a cam to drive a piston rod to squeeze the gas in the compressed air chamber through a connecting rod assembly, and the gas is blown toward the needle through the blowing assembly, thereby eliminating the influence of piston rod wear on the blowing volume and achieving a better cooling effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a needle blowing device, comprising:

[0006] A drive cam that can be rotatably arranged;

[0007] A piston rod slidably disposed in the compression chamber;

[0008] an air blowing assembly in communication with the compressed air chamber;

[0009] A connecting rod assembly connected between the driving cam and the piston rod;

[0010] When the driving cam rotates, the piston rod squeezes the compressed air chamber through the connecting rod assembly, and the gas discharged from the compressed air chamber is blown toward the needle through the blowing assembly.

[0011] Preferably, the connecting rod assembly includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod connected in sequence, wherein the two ends of the second connecting rod are respectively fixedly connected to the first connecting rod and the third connecting rod, the third connecting rod is rotatably connected to the fourth connecting rod, and the fourth connecting rod is fixedly connected to the piston rod.

[0012] Preferably, the connecting rod assembly further comprises a first adjusting assembly fixedly arranged between the first connecting rod and the second connecting rod, and the first adjusting assembly is used for adjusting the blowing volume of the blowing assembly.

[0013] Preferably, the first connecting rod is integrally formed with a first connecting sleeve, the second connecting rod is provided with a second adjustment hole, and the first adjustment assembly includes a first adjustment bolt passing through the second adjustment hole and the first connecting sleeve and a first locking nut fixed to the first adjustment bolt.

[0014] Preferably, the third connecting rod is L-shaped.

[0015] Preferably, the connecting rod assembly further comprises a second adjusting assembly fixedly arranged between the third connecting rod and the fourth connecting rod, and the second adjusting assembly is used for adjusting the blowing volume of the blowing assembly.

[0016] Preferably, the third connecting rod is provided with at least one third transfer hole, and the fourth connecting rod is provided with a fourth connecting hole; the second adjustment assembly comprises a second transfer pin passing through the fourth connecting hole and optionally passing through one of the third transfer holes.

[0017] Preferably, the connecting rod assembly also includes a connecting head fixedly sleeved on the piston rod and rotatably connected to the fourth connecting rod; the connecting head is fixedly provided with a connecting swivel pin, the fourth connecting rod is provided with a fourth avoidance hole, the fourth avoidance hole is a long waist-shaped hole, the connecting swivel pin passes through the fourth avoidance hole and is slidably connected to the fourth avoidance hole.

[0018] Preferably, the driving cam is sleeved on the upper shaft, and at least one set of timing adjustment components is provided between the driving cam and the upper shaft, and the timing adjustment components are used to adjust the position of the driving cam relative to the upper shaft so that the blowing component stops blowing when hooking the line; the timing adjustment component includes a radial adjustment hole of the driving cam and a radial adjustment screw correspondingly arranged in the radial adjustment hole.

[0019] The utility model also provides a sewing device, comprising the needle air blowing device.

[0020] Compared with the background technology, the needle blowing device provided by the utility model includes a driving cam, a piston rod, a blowing assembly and a connecting rod assembly. The piston rod is slidably arranged in the compressed air chamber, the blowing assembly is connected to the compressed air chamber, and the connecting rod assembly is connected between the driving cam and the piston rod. When the driving cam rotates, the driving cam drives the piston rod to move through the connecting rod assembly, the piston rod slides along the compressed air chamber, the piston rod squeezes the gas in the compressed air chamber, and the gas discharged from the compressed air chamber is blown to the needle through the blowing assembly, so that the needle is cooled.

[0021] The utility model changes the connection mode between the driving cam and the piston rod. The two are connected by a connecting rod assembly instead of directly offsetting each other. There is no wear between the driving cam and the piston rod, and the movement stroke of the piston rod is naturally not affected by the wear. The movement stroke of the piston rod is stable, the volume of gas blown out by the compression chamber to the blowing assembly each time remains unchanged, the air blowing volume of the blowing assembly to the machine needle remains unchanged, the cooling performance is stable, and the cooling effect is good.

[0022] The sewing equipment provided by the utility model comprises the needle air blowing device, the temperature rise of the needle is small, the fault of the bottom thread breaking is reduced, and the whole set of equipment works more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the needle blowing device provided by an embodiment of the utility model;

[0025] Figure 2 for Figure 1 Another structural schematic diagram of;

[0026] Figure 3 for Figure 1 Exploded diagram of

[0027] Figure 4 for Figure 1 Structural diagram of the middle link assembly;

[0028] Figure 5 for Figure 1 The structural diagram of the middle driving cam;

[0029] Figure 6 for Figure 1 The structural diagram of the first connecting rod;

[0030] Figure 7 for Figure 1 An assembly diagram of the first connecting rod, the second connecting rod and the first adjusting component;

[0031] Figure 8 for Figure 1 The structural diagram of the second connecting rod;

[0032] Fig. 9 for Figure 1 The structural diagram of the third connecting rod;

[0033] Fig.10 for Figure 1 Assembly drawing of the fourth connecting rod, connecting head and piston rod.

[0034] The reference numerals are as follows:

[0035] Driving cam 1, piston rod 2, blowing assembly 3, connecting rod assembly 4, machine needle 5, upper shaft 6, slewing bearing 7 and first shaft end retaining ring 8;

[0036] Radial adjustment hole 11, eccentric hole 12 and connecting boss 13;

[0037] Air pipe joint 31, air blowing head 32, air blowing pipe 33 and fixing block 34;

[0038] A first connecting rod 41, a second connecting rod 42, a third connecting rod 43, a fourth connecting rod 44, a first adjusting assembly 45, a second adjusting assembly 46, a connecting head 47 and a mounting seat 48;

[0039] A first connecting sleeve 411 and a first rotating sleeve 412;

[0040] A second adjustment hole 421;

[0041] A third adapter hole 431;

[0042] A fourth connecting hole 441 and a fourth avoiding hole 442;

[0043] A first adjusting bolt 451 and a first locking nut 452;

[0044] A second transfer pin 461;

[0045] Connect the rotating pin 471. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] The utility model embodiment discloses a needle blowing device, as shown in the attached Figures 1 to 3As shown, it includes a driving cam 1, a piston rod 2, a blowing assembly 3 and a connecting rod assembly 4. The driving cam 1 is eccentrically provided with an eccentric hole 12, and the upper shaft 6 passes through the eccentric hole 12, so that the driving cam 1 rotates synchronously with the upper shaft 6.

[0049] The piston rod 2 is slidably disposed in the compressed air chamber so that the piston rod 2 can squeeze the gas in the compressed air chamber. Specifically, the piston rod 2 is slidably disposed in a closed cylinder barrel, and a closed compressed air chamber is formed between the closed cylinder barrel and the piston rod 2. The cylinder barrel is placed above the piston rod 2. When the piston rod 2 moves upward, the compressed air chamber discharges gas; when the piston rod 2 moves downward, the compressed air chamber inhales gas.

[0050] The blowing assembly 3 is connected to the compressed air chamber, and the compressed air chamber blows the gas into the blowing assembly 3, and the blowing assembly 3 blows the gas to the machine needle 5. The blowing assembly 3 includes an air pipe joint 31 fixed to the top of the piston rod 2, a blowing head 32 aimed at the machine needle 5, and a blowing pipe 33 connected between the air pipe joint 31 and the blowing head 32. The blowing head 32 is fixed by a fixing block 34, so that the blowing head 32 is fixed relative to the machine needle 5.

[0051] The connecting rod assembly 4 is connected between the driving cam 1 and the piston rod 2, so that the driving cam 1 drives the piston rod 2 to move up and down through the connecting rod assembly 4. The connecting rod assembly 4 is rotatably connected to the driving cam 1, so that the driving cam 1 drives the connecting rod assembly 4 to move up and down. The connecting rod assembly 4 is fixedly connected to the piston rod 2, so that the connecting rod assembly 4 drives the piston rod 2 to move up and down.

[0052] When the driving cam 1 rotates, the driving cam 1 drives the piston rod 2 to move through the connecting rod assembly 4, and the piston rod 2 slides along the compressed air chamber. The piston rod 2 squeezes the gas in the compressed air chamber, and the gas discharged from the compressed air chamber is blown to the machine needle 5 through the blowing assembly 3, so that the machine needle 5 is cooled.

[0053] In summary, the utility model changes the connection mode between the driving cam 1 and the piston rod 2. The two are connected by the connecting rod assembly 4 instead of directly offsetting each other. There is no wear between the driving cam 1 and the piston rod 2, and the movement stroke of the piston rod 2 is naturally not affected by wear. The movement stroke of the piston rod 2 is stable, the volume of gas blown out by the compression chamber to the blowing assembly 3 each time remains unchanged, the blowing amount of the blowing assembly 3 to the machine needle 5 remains unchanged, the cooling performance is stable, and the cooling effect is good.

[0054] As attached Figures 4 to 10As shown, the connecting rod assembly 4 includes a first connecting rod 41, a second connecting rod 42, a third connecting rod 43 and a fourth connecting rod 44 which are connected in sequence, wherein the two ends of the second connecting rod 42 are respectively fixedly connected to the first connecting rod 41 and the third connecting rod 43, the third connecting rod 43 is rotatably connected to the fourth connecting rod 44, and the fourth connecting rod 44 is fixedly connected to the piston rod 2, so that the connecting rod assembly 4 can drive the piston rod 2 to move reciprocatingly up and down under the action of the driving cam 1.

[0055] The first connecting rod 41 is sleeved on the upper shaft 6. The first connecting rod 41 is integrally formed with a first rotating sleeve 412 at one end away from the second connecting rod 42. The first rotating sleeve 412 is sleeved on the connecting boss 13 of the driving cam 1. A slewing bearing 7 is provided between the first rotating sleeve 412 and the connecting boss 13 to support the relative rotation of the two. A first shaft end retaining ring 8 is fixedly provided at one end of the driving cam 1 facing the first connecting rod 41. The first rotating sleeve 412 is sandwiched between the first shaft end retaining ring 8 and the driving cam 1 to axially limit the first rotating sleeve 412 and the slewing bearing 7. Of course, the connection method between the first connecting rod 41 and the driving cam 1 is not limited to this.

[0056] As attached Figure 7 As shown, the connecting rod assembly 4 also includes a first adjustment assembly 45 fixed between the first connecting rod 41 and the second connecting rod 42, and the first adjustment assembly 45 is used to adjust the blowing volume of the blowing assembly 3. The first connecting rod 41 is integrally formed with a first connecting sleeve 411 at one end away from the first rotating sleeve 412, and the second connecting rod 42 is provided with a second adjustment hole 421, and the second adjustment hole 421 is an arc waist hole. The first adjustment assembly 45 includes a first adjustment bolt 451 passing through the second adjustment hole 421 and the first connecting sleeve 411 and a first locking nut 452 fixed to the first adjustment bolt 451, and the movement amplitude of the second connecting rod 42 is adjusted by adjusting the position of the first adjustment bolt 451 in the second adjustment hole 421, thereby indirectly adjusting the blowing volume of the blowing assembly 3 by adjusting the movement stroke of the piston rod 2. Of course, the structure of the first adjustment assembly 45 is not limited to this.

[0057] The third connecting rod 43 is L-shaped, which changes the power transmission direction of the connecting rod assembly 4, so that the connecting rod assembly 4 can better adapt to the reserved installation space between the upper shaft 6 and the piston rod 2, and no additional connecting rod is required, ensuring that the structure of the needle blowing device is more compact. The outer cover of the third connecting rod 43 is provided with a mounting seat 48, and the mounting seat 48 is fixedly arranged to support the connecting rod assembly 4. The third connecting rod 43 is rotatably connected to the mounting seat 48, and a bushing is provided between the third connecting rod 43 and the mounting seat 48 to prevent serious wear of the two.

[0058] The connecting rod assembly 4 also includes a second adjustment assembly 46 fixed between the third connecting rod 43 and the fourth connecting rod 44, and the second adjustment assembly 46 is used to further adjust the blowing volume of the blowing assembly 3. The third connecting rod 43 is provided with at least one third transfer hole 431, specifically, the third connecting rod 43 is provided with two third transfer holes 431. The fourth connecting rod 44 is provided with a fourth connecting hole 441 at one end away from the piston rod 2. The second adjustment assembly 46 includes a second transfer pin 461 passing through the fourth connecting hole 441 and optionally passing through one of the third transfer holes 431. By adjusting the installation position of the second transfer pin 461 on the fourth connecting rod 44, the movement amplitude of the fourth connecting rod 44 is adjusted, and the blowing volume of the blowing assembly 3 can also be indirectly adjusted by adjusting the movement stroke of the piston rod 2. The second adjustment assembly 46 may also include a limit pin radially passing through the second transfer pin 461, which is used to axially limit the second transfer pin 461. Of course, the structure of the second adjustment assembly 46 is not limited to this.

[0059] As attached Fig.10 As shown, the connecting rod assembly 4 also includes a connecting head 47 that is fixedly sleeved on the piston rod 2 and rotatably connected to the fourth connecting rod 44, so that the fourth connecting rod 44 and the piston rod 2 are fixedly connected. The connecting head 47 is fixedly provided with a connecting rotation pin 471, and the fourth connecting rod 44 is provided with a fourth avoidance hole 442, which is a long waist-shaped hole. The connecting rotation pin 471 passes through the fourth avoidance hole 442 and is slidably connected to the fourth avoidance hole 442. When the fourth connecting rod 44 moves up and down reciprocatingly, the fourth avoidance hole 442 guides the connecting head 47 to drive the piston rod 2 to intermittently reciprocate up and down, so as to avoid the fourth connecting rod 44 and the connecting head 47 from being stuck and causing the piston rod 2 to move unsmoothly.

[0060] The driving cam 1 is sleeved on the upper shaft 6, and at least one set of timing adjustment components is provided between the driving cam 1 and the upper shaft 6. The timing adjustment components are used to adjust the position of the driving cam 1 relative to the upper shaft 6 so that the blowing component 3 stops blowing when hooking the thread, thereby avoiding causing instability of the loop thread and improving the sewing quality.

[0061] The timing adjustment component includes a radial adjustment hole 11 of the driving cam 1 and a radial adjustment screw provided in the radial adjustment hole 11. Specifically, the driving cam 1 is provided with two radial adjustment holes 11. Of course, the structure of the timing adjustment component is not limited thereto.

[0062] The working principle of the needle blowing device provided by the utility model is as follows:

[0063] When the upper shaft 6 drives the driving cam 1 to rotate, the driving cam 1 drives the first connecting rod 41 to move reciprocatingly up and down through the rotary bearing 7, the first connecting rod 41 drives the third connecting rod 43 to rotate through the second connecting rod 42, the third connecting rod 43 drives the fourth connecting rod 44 to move reciprocatingly up and down intermittently, the fourth connecting rod 44 drives the piston rod 2 to move reciprocatingly up and down synchronously, the piston rod 2 squeezes the gas in the compressed air chamber, the gas is blown into the blowing head 32 through the blowing pipe 33, the blowing head 32 aims at the machine needle 5 to blow air, so as to cool the machine needle 5.

[0064] The utility model also discloses a sewing device, comprising the needle air blowing device, the temperature rise of the needle 5 is small, the failure of the bottom thread breaking is reduced, and the whole set of equipment works more reliably.

[0065] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0066] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A needle blowing device, characterized in that: include: A rotatably arranged driving cam (1); A piston rod (2) slidably arranged in the compressed air chamber; An air blowing assembly (3) in communication with the compressed air chamber; A connecting rod assembly (4) connected between the driving cam (1) and the piston rod (2); When the driving cam (1) rotates, the piston rod (2) squeezes the compressed air chamber through the connecting rod assembly (4), and the gas discharged from the compressed air chamber is blown toward the machine needle (5) through the blowing assembly (3).

2. The needle blowing device according to claim 1, characterized in that: The connecting rod assembly (4) comprises a first connecting rod (41), a second connecting rod (42), a third connecting rod (43) and a fourth connecting rod (44) which are connected in sequence, wherein two ends of the second connecting rod (42) are respectively fixedly connected to the first connecting rod (41) and the third connecting rod (43), the third connecting rod (43) is rotatably connected to the fourth connecting rod (44), and the fourth connecting rod (44) is fixedly connected to the piston rod (2).

3. The needle blowing device according to claim 2, characterized in that: The connecting rod assembly (4) further comprises a first adjusting assembly (45) fixedly arranged between the first connecting rod (41) and the second connecting rod (42), wherein the first adjusting assembly (45) is used to adjust the blowing volume of the blowing assembly (3).

4. The needle blowing device according to claim 3, characterized in that: The first connecting rod (41) is integrally formed with a first connecting sleeve (411), the second connecting rod (42) is provided with a second adjustment hole (421), and the first adjustment component (45) comprises a first adjustment bolt (451) passing through the second adjustment hole (421) and the first connecting sleeve (411), and a first locking nut (452) fixed to the first adjustment bolt (451).

5. The needle blowing device according to claim 2, characterized in that: The third connecting rod (43) is L-shaped.

6. The needle blowing device according to claim 3, characterized in that: The connecting rod assembly (4) further comprises a second adjusting assembly (46) fixedly arranged between the third connecting rod (43) and the fourth connecting rod (44), wherein the second adjusting assembly (46) is used to adjust the blowing volume of the blowing assembly (3).

7. The needle blowing device according to claim 6, characterized in that: The third connecting rod (43) is provided with at least one third transfer hole (431), and the fourth connecting rod (44) is provided with a fourth connecting hole (441); the second adjustment component (46) includes a second transfer pin (461) passing through the fourth connecting hole (441) and optionally passing through one of the third transfer holes (431).

8. The needle blowing device according to any one of claims 2 to 7, characterized in that: The connecting rod assembly (4) also includes a connecting head (47) which is fixedly sleeved on the piston rod (2) and rotatably connected to the fourth connecting rod (44); the connecting head (47) is fixedly provided with a connecting swivel pin (471), and the fourth connecting rod (44) is provided with a fourth avoidance hole (442), and the fourth avoidance hole (442) is a long waist-shaped hole, and the connecting swivel pin (471) passes through the fourth avoidance hole (442) and is slidably connected to the fourth avoidance hole (442).

9. The needle blowing device according to any one of claims 1 to 7, characterized in that: The driving cam (1) is sleeved on the upper shaft (6); at least one set of timing adjustment components is provided between the driving cam (1) and the upper shaft (6); the timing adjustment components are used to adjust the position of the driving cam (1) relative to the upper shaft (6) so that the blowing component (3) stops blowing when hooking a line; the timing adjustment components include a radial adjustment hole (11) of the driving cam (1) and a radial adjustment screw provided in the radial adjustment hole (11).

10. A sewing device, characterized in that: Including the needle blowing device as described in any one of claims 1 to 9.

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