Rotating shuttle oil quantity adjusting structure and sewing machine

Abstract

The rotating shuttle oil quantity adjusting structure comprises a base, a lower shaft, a lower shaft front sleeve, an oil inlet adjusting valve and an oil pump, the lower shaft, the lower shaft front sleeve, the oil inlet adjusting valve and the oil pump are installed on the base, the lower shaft front sleeve is installed on the lower shaft, and the oil pump is located at one end of the lower shaft; an oil inlet of the oil inlet adjusting valve is connected with an oil outlet of the oil pump through a rear connecting oil way, an oil outlet of the oil inlet adjusting valve is connected with an oil inlet hole of the lower shaft front sleeve through a front connecting oil way, an adjusting screw hole communicated with the oil return hole is formed in the lower shaft front sleeve, and an oil return adjusting screw is installed in the adjusting screw hole. The mode of simultaneously adjusting the oil inlet amount and the oil return amount is adopted, extensive adjustment of the oil inlet amount of the lower shaft front sleeve is achieved by controlling the opening degree of the oil inlet adjusting valve, fine adjustment of the oil return amount of the lower shaft front sleeve is achieved by controlling screwing-in and screwing-out of the oil return adjusting screw, and therefore the adjusting difficulty of the oil supply amount of the rotating shuttle is reduced, and the adjusting efficiency is improved. And the workload of operators is reduced.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a rotary hook oil volume adjustment structure and a sewing machine. Background Technology

[0002] The rotary hook is the most important part of a sewing machine. Its operation directly affects the performance of the entire machine, and it needs to be lubricated during operation.

[0003] Patent document CN105908402A discloses a sewing machine rotary hook oil supply mechanism. This mechanism has a rotary hook mounted at one end of a lower shaft, rotating synchronously with the lower shaft. An oil pump is mounted at the other end of the lower shaft. A lower shaft front sleeve is also mounted on the lower shaft, with an oil inlet and an oil return hole axially arranged on the front sleeve. The oil pump is connected to the oil inlet on the front sleeve via an oil supply pipe, and an oil return pipe is connected to the oil return hole. The oil inlet and oil return holes are located on opposite sides of the lower shaft and are interconnected. An oil volume adjustment screw hole is also provided on the front sleeve, intersecting and connecting with the oil inlet. An oil volume adjustment screw is installed in the oil volume adjustment screw hole, and the oil return volume of the oil return hole is adjusted by screwing the screw in and out, thereby adjusting the oil supply of the rotary hook.

[0004] However, in actual production activities, when operators adjust the oil supply of the rotary hook, due to the lack of a visual display of the return flow rate, it is difficult for operators to accurately grasp the amount of oil adjustment screw ...

[0005] Therefore, how to reduce the difficulty of adjusting the oil supply of the rotary hook has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of this utility model is to provide a rotary hook oil quantity adjustment structure to solve the technical problem of the difficulty in adjusting the oil quantity in the existing rotary hook oil supply structure.

[0007] The technical solution adopted by this utility model is as follows: a rotary hook oil volume adjustment structure, including: a base and a lower shaft, a lower shaft front sleeve, an oil inlet regulating valve and an oil pump installed on the base. The lower shaft front sleeve is installed on the lower shaft, and the oil pump is located at one end of the lower shaft. The oil inlet of the oil inlet regulating valve is connected to the oil outlet of the oil pump through a rear connecting oil passage, and the oil outlet of the oil inlet regulating valve is connected to the oil inlet hole of the lower shaft front sleeve through a front connecting oil passage. An adjusting screw hole communicating with the return oil hole is formed on the lower shaft front sleeve, and a return oil adjusting screw is installed in the adjusting screw hole.

[0008] Preferably, the oil inlet regulating valve includes a valve seat, a valve core, and an adjusting handle. The valve core is installed in the valve cavity of the valve seat, and the top of the valve core is fixedly connected to the adjusting handle. The valve core and the valve seat can rotate relative to each other, and when adjusting the opening of the oil inlet regulating valve, the rotation angle of the adjusting handle is less than or equal to 90°.

[0009] Preferably, the valve seat is formed with an oil inlet and an oil outlet, and the valve core is formed with an oil passage hole that mates with the oil inlet and the oil outlet; a circumferential limiting block is formed on the top of the valve core, and a circumferential stroke groove is formed on the top of the valve seat; the valve core is coaxially installed in the valve cavity of the valve seat, and the circumferential limiting block is located in the circumferential stroke groove.

[0010] Preferably, the central angle corresponding to the circumferential travel groove is less than or equal to 90°.

[0011] Preferably, an annular sealing protrusion is formed on the outer circumferential surface of the valve core, and the annular sealing protrusion is located between the circumferential limiting block and the oil passage hole, and an annular sealing groove is formed on the inner wall of the valve seat to cooperate with the annular sealing protrusion.

[0012] Preferably, the valve seat includes a cylindrical part and a plate part, the plate part is fixedly connected to the bottom end of the cylindrical part, and the plate part is formed with mounting holes, and the oil inlet and oil outlet are symmetrically arranged on both sides of the cylindrical part.

[0013] Preferably, the adjustment handle is provided with an indicator mark.

[0014] Preferably, the oil inlet regulating valve is a ball valve.

[0015] The second objective of this invention is to provide a sewing machine that includes the aforementioned rotary hook oil level adjustment structure.

[0016] The beneficial effects of this utility model are:

[0017] This invention employs a method of simultaneously adjusting the oil inlet and return flow. An oil inlet regulating valve is installed on the oil inlet pipe between the oil pump and the lower shaft front sleeve. By controlling the opening of the oil inlet regulating valve, the oil inlet flow of the lower shaft front sleeve can be roughly adjusted. A return oil regulating screw is installed on the lower shaft front sleeve to control the return flow of the return oil hole. By controlling the screw's screw in and out, the return flow of the lower shaft front sleeve can be finely adjusted. Thus, by coordinating the adjustment of the oil inlet and return flow, the difficulty of adjusting the rotary hook's oil supply is reduced, and the workload of the operator is decreased. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rotary hook oil volume adjustment structure of this utility model;

[0019] Figure 2A schematic diagram of the rotary hook oil volume adjustment structure after the base is removed;

[0020] Figure 3 A three-dimensional schematic diagram of the oil inlet regulating valve;

[0021] Figure 4 This is a schematic diagram of the oil inlet regulating valve;

[0022] Figure 5 This is a schematic diagram of the valve core structure;

[0023] Figure 6 This is a schematic diagram of the valve seat structure;

[0024] Figure 7 This is a schematic diagram of the structure of the lower shaft front sleeve.

[0025] Explanation of the reference numerals in the figure:

[0026] 10. Base;

[0027] 20. Lower shaft;

[0028] 30. Lower axle front sleeve;

[0029] 30. Lower shaft front sleeve; 31. Oil inlet hole; 32. Oil return hole;

[0030] 40. Oil inlet regulating valve; 41. Valve seat; 411. Cylinder body; 412. Plate body; 413. Oil inlet; 414. Oil outlet; 415. Circumferential stroke groove; 416. Mounting hole; 42. Valve core; 421. Oil passage hole; 422. Circumferential limit block; 423. Annular sealing protrusion; 422. Top cover; 43. Adjusting handle; 431. Indicator mark;

[0031] 50. Oil pump;

[0032] 60. Connect the oil circuit afterwards;

[0033] 70. Front connection oil circuit;

[0034] 80. Oil return adjusting screw;

[0035] 90. Rotary shuttle. Detailed Implementation

[0036] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0037] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] Examples, such as Figures 1-7 As shown, a rotary hook oil volume adjustment structure includes: a base 10 and a lower shaft 20, a lower shaft front sleeve 30, an oil inlet regulating valve 40, and an oil pump 50 mounted on the base 10. The lower shaft front sleeve 30 is mounted on the lower shaft 20, and the oil pump 50 is located at one end of the lower shaft 20. The oil inlet 413 of the oil inlet regulating valve 40 is connected to the oil outlet of the oil pump 50 through a rear connecting oil passage 60, and the oil outlet 414 of the oil inlet regulating valve 40 is connected to the oil inlet 31 of the lower shaft front sleeve 30 through a front connecting oil passage 70. The lower shaft front sleeve 30 has an adjusting screw hole that communicates with the return oil hole 32, and a return oil adjusting screw 80 is installed in the adjusting screw hole.

[0041] This utility model adopts a method of simultaneously adjusting the oil inlet and return flow. An oil inlet regulating valve 40 is installed on the oil inlet pipeline between the oil pump 50 and the lower shaft front sleeve 30. By controlling the opening of the oil inlet regulating valve 40, the oil inlet flow of the lower shaft front sleeve 30 can be roughly adjusted. A return oil regulating screw 80 is installed on the lower shaft front sleeve 30 to control the return flow of the return oil hole 32. By controlling the screw 80 to screw in or out, the return flow of the lower shaft front sleeve 30 can be finely adjusted. Thus, by coordinating the adjustment of the oil inlet and return flow, the difficulty of adjusting the oil supply of the rotary hook is reduced, and the workload of the operator is reduced.

[0042] Specific embodiment 1, such as Figures 1-7 As shown, a rotary hook oil volume adjustment structure includes: a base 10, which is arranged in a transverse direction, and a lower shaft 20, a lower shaft front sleeve 30, an oil inlet regulating valve 40 and an oil pump 50 are installed on the base 10.

[0043] The lower shaft 20 is mounted on the base 10 in a transverse direction. A rotary hook 90 is mounted at the front end of the lower shaft 20 and is connected to the lower shaft 20. The rotary hook 90 rotates synchronously with the lower shaft 20. An oil pump 50 is mounted at the rear end of the lower shaft 20 and is fixedly connected to the base 10 for supplying oil to the rotary hook 90.

[0044] The lower shaft front sleeve 30 is installed on the lower shaft 20, and the lower shaft front sleeve 30 is located at the end of the lower shaft 20 near the rotary hook 90. ​​An oil inlet hole 31 and an oil return hole 32 are formed on the lower shaft front sleeve along the axial direction. At the same time, an adjusting screw hole (not shown in the figure) that is perpendicularly connected to the oil return hole 32 is also formed on the lower shaft front sleeve 30. An oil return adjusting screw 80 is installed in the adjusting screw hole so that the oil return amount of the oil return hole 32 can be adjusted by screwing the oil return adjusting screw 80 in and out of the adjusting thread hole.

[0045] The oil inlet regulating valve 40 is fixedly connected to the base 10, and the oil inlet 413 of the oil inlet regulating valve 40 is connected to one end of the rear connecting oil passage 60. The other end of the rear connecting oil passage 60 is connected to the oil outlet of the oil pump 50. The oil outlet 414 of the oil inlet regulating valve 40 is connected to one end of the front connecting oil passage 70. The other end of the front connecting oil passage 70 is connected to the oil inlet hole 31 of the lower shaft front sleeve 30, so as to adjust the oil inlet volume of the oil inlet 413 by controlling the opening of the oil inlet regulating valve 40.

[0046] Preferred, such as Figure 3 and Figure 4 As shown, the oil inlet regulating valve 40 includes an adjusting handle 43. Rotating the adjusting handle 43 can change the opening degree of the oil inlet regulating valve 40. The opening degree of the oil inlet regulating valve 40 can change from fully open to fully closed. The rotation angle of the adjusting handle 43 is less than or equal to 90°, so that the position of the adjusting handle 43 can be used to visually display the amount of oil entering the lower shaft front sleeve 30, so that the operator can quickly know the amount of oil entering the lower shaft front sleeve 30.

[0047] An indicator 431 is provided on the adjusting handle 43, which is used to indicate the opening degree of the oil inlet regulating valve 40.

[0048] It should be noted that the oil inlet regulating valve 40 can be any known manual valve, as long as the rotation range of the handle is within 90° when adjusting the opening of the manual valve, such as a ball valve. The following is a detailed description of one example, provided only as an illustrative example: The oil inlet regulating valve 40 includes a valve seat 41, a valve core 42, and an adjusting handle 43. An oil inlet 413 and an oil outlet 414 are formed on the valve seat 41. An oil passage hole 421 that mates with the oil inlet 413 and the oil outlet 414 is formed on the valve core 42. The valve core 42 is rotatably mounted in the valve cavity of the valve seat 41. The adjusting handle 43 is located above the valve seat 41 and is fixedly connected to the top of the valve core 42. When adjusting the opening of the oil inlet regulating valve 40, the rotation angle of the adjusting handle 43 is less than or equal to 90°. This allows the adjusting handle 43 to drive the valve core 42 to rotate relative to the valve seat 41, thereby changing the facing area of ​​the oil passage hole 421 with the oil inlet 413 and the oil outlet 414, thus achieving the adjustment of the opening of the oil inlet regulating valve 40.

[0049] More preferably, such as Figure 4 , Figure 5 and Figure 6 As shown, the rotation angle of the adjusting handle 43 is controlled as follows: the valve core 42 is cylindrical in shape, and a circumferential limiting block 422 is fixedly connected to the top of the valve core 42. There are two circumferential limiting blocks 422, and the two circumferential limiting blocks 422 are symmetrically arranged on both sides of the valve core 42. The valve seat 41 includes a cylindrical part 411, and a circumferential stroke groove 415 is formed at the top of the cylindrical part 411. The circumferential stroke groove 415 extends along the circumferential direction of the valve core 42. The two circumferential stroke grooves 415 are symmetrically arranged on both sides of the cylindrical part 411, and the central angle corresponding to the circumferential stroke groove 415 is less than or equal to 90°. When the valve core 42 is coaxially installed in the valve cavity of the valve seat 41, the outer circumferential surface of the valve core 42 is in close contact with the inner circumferential surface of the valve seat 41, and the circumferential limit blocks 422 are located in the circumferential stroke grooves 415 in a one-to-one correspondence, so that when the valve core 42 rotates circumferentially relative to the valve seat 41, the rotation angle of the valve core 42 does not exceed 90° due to the stopping effect of the end faces of the circumferential stroke grooves 415.

[0050] Specifically, such as Figure 6 As shown, the valve seat 41 includes a cylindrical part 411 and a plate part 412. The top of the cylindrical part 411 is open, and the oil inlet 413 and the oil outlet 414 are symmetrically arranged on both sides of the cylindrical part 411, that is, the oil inlet 413 and the oil outlet 414 are coaxially arranged. The plate part 412 is vertically fixedly connected to the bottom end of the cylindrical part 411, and the plate part 412 is formed with a mounting hole 416 so as to fix the oil inlet regulating valve 40 to the base 10 by connecting screws passing through the mounting hole 416.

[0051] Further optimized, such as Figure 4 and Figure 5As shown, the fixed connection between the valve core 42 and the valve seat 41 is achieved as follows: the valve core 42 is cylindrical in shape, and an annular sealing protrusion 423 is formed on the outer circumferential surface of the valve core 42. The annular sealing protrusion 423 is located at the top of the valve core 42 and is located between the circumferential limiting block 422 and the oil passage hole 421. An annular sealing groove (not shown in the figure) is formed on the inner wall of the cylindrical part 411 of the valve seat 41. The annular sealing groove is located at the top of the valve seat 41 and is located below the circumferential stroke groove 415. When the valve core 42 is coaxially installed in the valve cavity of the valve seat 41 (the valve core 42 is inserted into the valve cavity of the valve seat 41 from top to bottom, and when the annular sealing protrusion 423 is inserted into the annular sealing groove, the cover plate at the top of the valve core 42 is just in contact with the upper surface of the valve seat 41), the annular sealing protrusion 423 is located in the annular sealing groove, and the outer surface of the annular sealing protrusion 423 is in close contact with the inner surface of the annular sealing groove. This not only achieves a fixed connection between the valve core 42 and the valve seat 41 in the axial direction, but also achieves a sealed connection between the valve core 42 and the valve seat 41 to prevent oil leakage.

[0052] An example is a sewing machine that includes the aforementioned rotary hook oil level adjustment structure.

[0053] The working process of the rotary hook oil quantity adjustment structure of this utility model is as follows:

[0054] When adjusting the oil supply of the rotary hook, the operator can visually see the amount of oil entering the lower shaft front sleeve by adjusting the position of the adjustment handle on the oil quantity adjustment valve. According to the oil demand of the rotary hook, the opening of the oil inlet adjustment valve can be adjusted by rotating the adjustment handle to achieve a coarse adjustment of the oil inlet of the lower shaft front sleeve; then, the oil return adjustment screw can be screwed in and out to achieve a fine adjustment of the oil return of the lower shaft front sleeve. This not only reduces the difficulty of adjusting the oil supply of the rotary hook, but also reduces the amount of screwing in and out of the oil return adjustment screw, thus reducing the workload of the operator.

[0055] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0056] By controlling the adjustment handle to rotate 90°, when adjusting the oil inlet regulating valve, the oil inlet volume can be displayed more intuitively, and the oil volume and the opening / closing can be adjusted quickly. Compared with controlling the oil inlet volume by rotating the screw, it is faster and more effective.

[0057] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A rotary shuttle oil quantity adjustment structure, characterized in that, include: The base (10) includes a lower shaft (20), a lower shaft front sleeve (30), an oil inlet regulating valve (40), and an oil pump (50) mounted on the base (10). The lower shaft front sleeve (30) is mounted on the lower shaft (20), and the oil pump (50) is located at one end of the lower shaft (20). The oil inlet (413) of the oil inlet regulating valve (40) is connected to the oil outlet of the oil pump (50) through a rear connecting oil passage (60), and the oil outlet (414) of the oil inlet regulating valve (40) is connected to the oil inlet (31) of the lower shaft front sleeve (30) through a front connecting oil passage (70). The lower shaft front sleeve (30) has an adjusting screw hole that communicates with the return oil hole (32), and a return oil adjusting screw (80) is installed in the adjusting screw hole.

2. The rotary shuttle oil quantity adjustment structure according to claim 1, characterized in that, The oil inlet regulating valve (40) includes a valve seat (41), a valve core (42), and an adjusting handle (43). The valve core (42) is installed in the valve cavity of the valve seat (41). The top of the valve core (42) is fixedly connected to the adjusting handle (43). The valve core (42) and the valve seat (41) can rotate relative to each other. When adjusting the opening of the oil inlet regulating valve (40), the rotation angle of the adjusting handle (43) is less than or equal to 90°.

3. The rotary shuttle oil quantity adjustment structure according to claim 2, characterized in that, The valve seat (41) is formed with an oil inlet (413) and an oil outlet (414), and the valve core (42) is formed with an oil passage hole (421) that cooperates with the oil inlet (413) and the oil outlet (414); the top of the valve core (42) is formed with a circumferential limiting block (422), the top of the valve seat (41) is formed with a circumferential stroke groove (415), the valve core (42) is coaxially installed in the valve cavity of the valve seat (41), and the circumferential limiting block (422) is located in the circumferential stroke groove (415).

4. The rotary shuttle oil quantity adjustment structure according to claim 3, characterized in that, The central angle corresponding to the circumferential travel groove (415) is less than or equal to 90°.

5. The rotary shuttle oil quantity adjustment structure according to claim 3, characterized in that, The valve core (42) has an annular sealing protrusion (423) formed on its outer circumferential surface, and the annular sealing protrusion (423) is located between the circumferential limiting block (422) and the oil passage hole (421). The valve seat (41) has an annular sealing groove formed on its inner wall that cooperates with the annular sealing protrusion (423).

6. The rotary shuttle oil quantity adjustment structure according to claim 3, characterized in that, The valve seat (41) includes a cylindrical part (411) and a plate part (412). The plate part (412) is fixedly connected to the bottom end of the cylindrical part (411), and the plate part (412) is formed with a mounting hole (416). The oil inlet (413) and the oil outlet (414) are symmetrically arranged on both sides of the cylindrical part (411).

7. The rotary shuttle oil quantity adjustment structure according to claim 2, characterized in that, An indicator (431) is provided on the adjustment handle (43).

8. The rotary shuttle oil quantity adjustment structure according to claim 1, characterized in that, The oil inlet regulating valve (40) is a ball valve.

9. A sewing machine, characterized in that, The sewing machine includes the rotary hook oil volume adjustment structure as described in any one of claims 1-8.

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