Rotating shuttle for cooling based on Venturi effect and sewing machine

Abstract

The rotating shuttle comprises a shuttle frame and a rotating body, the rotating body comprises shuttle skin, a shuttle race and a shuttle plate which are mutually fixed, the rotating body is provided with a guide rail groove, the rotating shuttle further comprises a cooling structure, the cooling structure comprises a plurality of venturi effect pipelines arranged on the rotating body, and the venturi effect pipelines are arranged on the rotating body. A first port of the Venturi effect pipeline is located on the outer side wall of the rotating body, a second port of the Venturi effect pipeline is communicated with the interior of the guide rail groove, and the first port of the Venturi effect pipeline is located in front of the second port in the rotating direction of the rotating body. The Venturi effect pipeline sequentially comprises an air inlet channel, a throat channel and an air outlet channel from a first port to a second port, the inner diameter of the air inlet channel is gradually decreased in the direction from the first port to the second port, and the inner diameter of the air outlet channel is gradually increased in the direction from the first port to the second port; when the rotating body rotates, surrounding gas can enter the Venturi effect pipeline from the first port.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing equipment, in particular to a rotary hook for cooling based on the Venturi effect, and a sewing machine. Background Art

[0002] The primary function of the rotary hook in a sewing machine is to wind the thread, forming a loop and achieving continuous thread transport, thus creating a lockstitch. As people's living standards improve, their demands for clothing quality and taste are also increasing. Oil-free rotary hooks are adapting to this trend and are being used in a growing number of applications, reducing or eliminating the need for lubricants during operation.

[0003] See attached Figure 1 and attached Figure 2 As shown, the existing rotary hook is composed of: a shuttle bed 4 (commonly known as the outer shuttle), a shuttle skin 1 (commonly known as the thread-passing plate), a shuttle frame 3 (commonly known as the inner shuttle), and a shuttle plate 2 (commonly known as the moon ring). The shuttle bed 4, the shuttle skin 1, the shuttle frame 3 and the shuttle plate 2 have a common axis, which is called the central axis 5 of the rotary hook. The shuttle frame 3 is fixed in mid-air, and the shuttle skin 1, the shuttle plate 2 and the shuttle bed 4 are fixedly connected to form a rotating body, which rotates around the central axis 5 of the rotary hook. In order to stabilize the rotation of the rotating body, a guide rail 301 extending circumferentially around the axis of the rotary hook is provided on the shuttle frame 3, and guide rail grooves 6 extending circumferentially around the central axis 5 of the rotary hook are provided at corresponding positions of the shuttle plate 2 and the shuttle bed 4. The rotating guide rail groove 6 of the rotating body moves along the guide rail 301. The axial position of the rotating body is stabilized by the cooperation between the two side surfaces of the guide rail groove 6 and the two side surfaces of the guide rail 301. The cooperation between the bottom surface of the guide rail groove 6 and the top surface of the guide rail 301 can stabilize the radial position of the rotating body.

[0004] During actual operation, the rotating body can reach a maximum speed of 10,000 rpm. The guide rail and guide groove inevitably contact each other, generating irreversible friction. Although the measured temperature rise on the rotary hook surface is around 20 degrees Celsius, the temperature rise at the friction surface between the guide rail and the guide groove exceeds 140 degrees Celsius. This shortens the life of the rotary hook's friction pair, affecting its operating stability and the hook's sewing performance, thus limiting its lifespan. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a rotary hook and a sewing machine that are cooled based on the Venturi effect. By cooling the rotary hook through the Venturi effect, the temperature of the friction part of the rotary hook can be reduced.

[0006] To achieve the above-mentioned purpose, the utility model provides a rotary hook for cooling based on the Venturi effect, comprising a shuttle frame and a rotating body, the shuttle frame being fixedly arranged, the rotating body being mounted on the shuttle frame and rotating around the central axis of the rotating hook, the shuttle frame being provided with a guide rail, the rotating body being provided with a guide rail groove, and the guide rail groove moves along the guide rail when the rotating body rotates, and also comprising a cooling structure, the cooling structure comprising a plurality of Venturi effect pipes arranged on the rotating body, the first port of the Venturi effect pipe being located on the outer wall of the rotating body, the second port being connected to the inside of the guide rail groove, the first port of the Venturi effect pipe being located in front of the second port in the rotation direction of the rotating body, the Venturi effect pipe comprising an air inlet channel, a throat channel and an air outlet channel in sequence from the first port to the second port, the inner diameter of the air inlet channel gradually becoming smaller along the direction from the first port to the second port, and the inner diameter of the air outlet channel gradually becoming larger along the direction from the first port to the second port; when the rotating body rotates, the surrounding gas can enter the Venturi effect pipe from the first port.

[0007] Furthermore, the cross-sections of the Venturi effect pipes are all circular.

[0008] Furthermore, the centerline axis of the Venturi effect pipe is a straight line, and the centerline axis forms a center point A in the first port.

[0009] Furthermore, the centerline axis of the Venturi effect pipe forms a center point A in the first port, and the angle θ between the vertical line L connecting the center point A and the center axis of the rotary hook and the centerline axis of the Venturi effect pipe is 45° to 60°.

[0010] Furthermore, the rotating body includes a shuttle skin, a shuttle bed and a shuttle plate fixed to each other, and the guide rail groove includes a first groove section and a second groove section, the first groove section is arranged on the shuttle bed, and the Venturi effect pipe connected to the first groove section is also arranged in the shuttle bed, and the second groove section is arranged on the shuttle bed on one side and on the shuttle plate on the other side, and the Venturi effect pipe connected to the second groove section is arranged in the shuttle plate.

[0011] Furthermore, the second port of the Venturi effect pipe connected to the first trough section is located at the bottom surface of the trough of the first trough section.

[0012] Furthermore, the bottom surface of the second trough section has a gap space between the shuttle bed and the shuttle plate, and the second port of the Venturi effect pipe connected to the second trough section is connected to the gap space.

[0013] Furthermore, the shuttle bed is provided with a plurality of Venturi effect pipes connected to the first groove section, and the plurality of Venturi effect pipes are arranged at equal intervals in the circumferential direction of the shuttle bed; the shuttle plate is provided with a plurality of Venturi effect pipes connected to the second groove section, and the plurality of Venturi effect pipes are arranged at equal intervals in the circumferential direction of the shuttle plate.

[0014] Furthermore, the first port of the Venturi effect pipe on the shuttle bed is located on the outer peripheral surface of the shuttle bed; the first port of the Venturi effect pipe on the shuttle plate is located on the outer peripheral surface of the shuttle plate.

[0015] The utility model also provides a sewing machine, comprising the above-mentioned rotary hook that performs cooling based on the Venturi effect.

[0016] As described above, the rotary hook and sewing machine of the present invention have the following beneficial effects:

[0017] By arranging a cooling structure composed of a Venturi effect duct on the rotating body, air automatically enters the Venturi effect duct when the rotating body rotates, and utilizes the Venturi effect to ensure that air can continuously and stably enter the guide rail groove through the Venturi effect duct, which can cool the friction between the guide rail groove and the guide rail, so that the guide rail and the rotary hook are kept at a lower operating temperature as a whole, so that the rotary hook has excellent working stability and excellent sewing performance; and the structure of the entire cooling structure is simple, and no additional components are required. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the rotary hook of the utility model.

[0019] Figure 2 This is an exploded view of the rotary hook of the present utility model.

[0020] Figure 3 It is a structural schematic diagram of the guide rail groove in the utility model.

[0021] Figure 4 This is a structural schematic diagram of the second slot section and the connected Venturi effect pipe in the present invention.

[0022] Figure 5 for Figure 4 Enlarged view of circle E.

[0023] Figure 6 This is a structural schematic diagram of the first slot section and the connected Venturi effect pipe in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the Venturi effect pipe in the present invention.

[0025] Explanation of Figure Numbers

[0026] 1 shuttle leather

[0027] 2 shuttle plates

[0028] 3 shuttle racks

[0029] 301 guide rail

[0030] 4 shuttle bed

[0031] 5. Center axis of rotary hook

[0032] 6 guide rail grooves

[0033] 601 First Slot Section

[0034] 602 Second slot section

[0035] 7 Venturi effect pipe

[0036] 701 First Port

[0037] 702 Second Port

[0038] 703 air intake duct

[0039] 704 Throat passage

[0040] 705 exhaust channel

[0041] 8 Interstitial Space DETAILED DESCRIPTION

[0042] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0043] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of this utility model. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of this utility model without substantially changing the technical content.

[0044] See also Figures 1 to 7The utility model provides a rotary hook for cooling based on the Venturi effect, including a shuttle frame 3 and a rotating body, the rotating body including a shuttle skin 1, a shuttle bed 4 and a shuttle plate 2 fixed to each other, the shuttle frame 3 is fixedly arranged in the sewing machine, the rotating body is installed on the shuttle frame 3, and rotates around the central axis 5 of the rotary hook, a guide rail 301 is provided on the shuttle frame 3, and a guide rail groove 6 is provided on the rotating body, the guide rail 301 and the guide rail groove 6 both extend circumferentially along the central axis 5 of the rotary hook to form an arc-shaped structure, and the guide rail groove 6 moves along the guide rail 301 when the rotating body rotates. The above is an existing structure. The improvement of the present invention is that a cooling structure is also provided, which includes several Venturi effect pipes 7 arranged on the rotating body, the first port 701 of the Venturi effect pipe 7 is located on the outer wall of the rotating body, and the second port 702 is connected to the inside of the guide rail groove 6. Specifically, the second port 702 can be directly connected to the inside of the guide rail groove 6 or through other intermediate channels; the Venturi effect pipe 7 is arranged to be radially inclined relative to the rotating body, and its first port 701 is located in front of the second port 702 in the rotation direction of the rotating body. The Venturi effect pipe 7 includes an air inlet channel 703, a throat channel 704 and an air outlet channel 705 from the first port 701 to the second port 702. The inner diameter of the air inlet channel 703 gradually decreases along the direction from the first port 701 to the second port 702, and the inner diameter of the air outlet channel 705 gradually increases along the direction from the first port 701 to the second port 702. When the rotating body rotates, its surrounding gas can enter the Venturi effect pipe 7 from the first port 701. The throat channel 704 serves to connect the air inlet channel 703 and the air outlet channel 705 , and is preferably a channel of equal cross-section.

[0045] The main working principle of the rotary hook involved in the utility model is: when the rotary hook is working, the rotating body rotates, see Figure 7 Because the Venturi effect duct 7 is inclined with respect to the radial direction of the rotating body, and the first port 701 is located ahead of the second port 702 in the direction of rotation of the rotating body, the first port 701 of the Venturi effect duct 7 cuts the air when the rotating body rotates, causing the airflow to flow along the windward direction of the rotary shuttle and enter the air inlet channel 703 of the Venturi effect duct 7 through the first port 701. When the airflow flows in the air inlet channel 703, as the cross-section gradually decreases, the flow rate of the airflow increases and the pressure decreases. At this time, a certain degree of vacuum is generated in the air inlet channel 703, causing the air around the first port 701 to be sucked into the air inlet channel 703, thereby ensuring that air continuously enters the air inlet channel 703; the airflow passes through the throat channel 704 and enters the air outlet channel 705. In the air outlet channel 705, the flow rate of the gas gradually decreases, and the airflow exits the first port 701 and finally enters the guide rail groove 6, thereby removing the heat generated by the friction between the guide rail groove 6 and the guide rail 301, thereby achieving a cooling effect.

[0046] See also Figures 1 to 6The present invention is further described below with a specific embodiment:

[0047] In this embodiment, see Figure 7 As a preferred design, the Venturi effect conduit 7 is a circular hole with a variable diameter. Its cross-section (cross-section perpendicular to the central axis) is circular at all locations. The Venturi effect conduit 7 is a straight hole, that is, its central axis is a straight line. Furthermore, the central axis of the Venturi effect conduit 7 forms a central point A in the first port 701. The central point A is the center point of the first port 701, and the angle θ between the perpendicular line L between the central point A and the central axis 5 of the rotary hook (that is, the center line of the circle where the central point A is located and centered on the central axis 5 of the rotary hook) and the central axis of the Venturi effect conduit 7 is 45° to 60°. Figure 7 , which can better allow air to enter the Venturi effect duct 7. Of course, in other embodiments, the central axis of the Venturi effect duct 7 may also have a suitable curve, and part of its cross section may not be circular.

[0048] In this embodiment, as a preferred design, see Figure 3 and Figure 6 The guideway groove 6 on the rotating body includes a first groove section 601 and a second groove section 602. The first groove section 601 is entirely located on the shuttle bed 4. The Venturi-effect duct 7 connected to the first groove section 601 is also provided on the shuttle bed 4. The second port 702 of the Venturi-effect duct 7 is located on the bottom surface of the first groove section 601. Of course, the second port 702 can also be located on both sides of the first groove section 601. The shuttle bed 4 is provided with multiple Venturi-effect ducts 7 connected to the first groove section 601. The multiple Venturi-effect ducts 7 are arranged at equal intervals in the circumferential direction and are located at appropriate locations on the shuttle bed 4 that are not obstructed by the shuttle skin 1. Furthermore, the first ports 701 of the Venturi-effect ducts 7 on the shuttle bed 4 are preferably located on the outer circumferential surface of the shuttle bed 4 to facilitate air intake and manufacturing.

[0049] In this embodiment, see Figure 3 、 Figure 4 and Figure 5The second trough section 602 is formed by the shuttle bed 4 and the shuttle plate 2. One side of the second trough section 602 is located on the shuttle bed 4 and the other side is located on the shuttle plate 2. The Venturi-effect duct 7 communicating with the first trough section 601 is located in the shuttle plate 2. Specifically, the bottom surface and first side surface of the second trough section 602 are located on the shuttle bed 4, while the second side surface is located on the shuttle plate 2. There is a gap between the second side surface and the shuttle bed 4, resulting in the bottom surface of the second trough section 602 not being a complete surface, but rather having a gap 8 near the second side surface. The Venturi-effect duct 7 in the shuttle plate 2 communicating with the second trough section 602 is located on the portion of the shuttle plate 2 located on the outer circumference of the shuttle bed 4. Its second port 702 is not directly located on the bottom surface of the second trough section 602, but rather connects to the gap 8, communicating with the interior of the second trough section 602 through the gap 8. Of course, the second port 702 of the Venturi-effect duct 7 can also be located directly on the side surface of the second trough section 602. The first ports 701 of the Venturi effect pipes 7 on the shuttle plate 2 are preferably located on the outer peripheral surface of the shuttle plate 2 to facilitate air intake and processing and manufacturing.

[0050] The rotary hook of the utility model is combined with the existing oil-free rotary hook and rotary hook surface coating technology to realize the complete oil-free operation of the rotary hook.

[0051] The utility model also provides a sewing machine, comprising the above-mentioned rotary hook that performs cooling based on the Venturi effect.

[0052] As can be seen from the above, the rotary hook and sewing machine of the present invention have the following beneficial effects:

[0053] By arranging a cooling structure composed of a Venturi effect duct 7 on the rotating body, air automatically enters the Venturi effect duct 7 when the rotating body rotates, and utilizes the Venturi effect to ensure that air can continuously and stably enter the guide rail groove 6 through the Venturi effect duct 7, which can cool the friction between the guide rail groove 6 and the guide rail 301, so that the guide rail 301 and the rotary hook as a whole are kept at a lower operating temperature, so that the rotary hook has excellent working stability and excellent sewing performance; and the structure of the entire cooling structure is simple, and no additional components are required.

[0054] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A rotary hook for cooling based on the Venturi effect, comprising a shuttle frame (3) and a rotating body, wherein the shuttle frame (3) is fixedly arranged, the rotating body is mounted on the shuttle frame (3) and rotates around the central axis (5) of the rotary hook, the shuttle frame (3) is provided with a guide rail (301), the rotating body is provided with a guide rail groove (6), and when the rotating body rotates, the guide rail groove (6) moves along the guide rail (301), characterized in that: The invention also includes a cooling structure, wherein the cooling structure includes a plurality of Venturi effect pipes (7) arranged on the rotating body, wherein the first port (701) of the Venturi effect pipe (7) is located on the outer wall of the rotating body, and the second port (702) is connected to the inside of the guide rail groove (6); the first port (701) of the Venturi effect pipe (7) is located in front of the second port (702) in the rotation direction of the rotating body; the Venturi effect pipe (7) includes an air inlet channel (703), a throat channel (704) and an air outlet channel (705) in sequence from the first port (701) to the second port (702); the inner diameter of the air inlet channel (703) gradually decreases in the direction from the first port (701) to the second port (702); and the inner diameter of the air outlet channel (705) gradually increases in the direction from the first port (701) to the second port (702); when the rotating body rotates, the surrounding gas can enter the Venturi effect pipe (7) from the first port (701).

2. The rotary hook for cooling based on the Venturi effect according to claim 1, characterized in that: The cross sections of the Venturi effect pipes (7) are all circular.

3. The rotary hook for cooling based on the Venturi effect according to claim 1, characterized in that: The centerline axis of the Venturi effect pipe (7) is a straight line, and the centerline axis forms a center point A in the first port (701).

4. The rotary hook for cooling based on the Venturi effect according to claim 3, characterized in that: The centerline axis of the Venturi effect pipe (7) forms a center point A in the first port (701), and the angle θ between the vertical line L connecting the center point A and the central axis of the rotary hook (5) and the centerline axis of the Venturi effect pipe (7) is 45° to 60°.

5. The rotary hook for cooling based on the Venturi effect according to claim 1, characterized in that: The rotating body comprises a shuttle skin (1), a shuttle bed (4) and a shuttle plate (2) fixed to each other; the guide rail groove (6) comprises a first groove section (601) and a second groove section (602); the first groove section (601) is arranged on the shuttle bed (4), and a Venturi effect pipe (7) connected to the first groove section (601) is also arranged in the shuttle bed (4); the second groove section (602) is arranged on the shuttle bed (4) on one side and on the shuttle plate (2) on the other side, and the Venturi effect pipe (7) connected to the second groove section (602) is arranged in the shuttle plate (2).

6. The rotary hook for cooling based on the Venturi effect according to claim 5, characterized in that: The second port (702) of the Venturi effect pipe (7) connected to the first slot section (601) is located at the slot bottom surface of the first slot section (601).

7. The rotary hook for cooling based on the Venturi effect according to claim 5, characterized in that: The bottom surface of the second trough section (602) has a gap space (8) located between the shuttle bed (4) and the shuttle plate (2), and the second port (702) of the Venturi effect pipe (7) connected to the second trough section (602) is connected to the gap space (8).

8. The rotary hook for cooling based on the Venturi effect according to claim 5, characterized in that: The shuttle bed (4) is provided with a plurality of Venturi effect pipes (7) connected to the first slot section (601), and the plurality of Venturi effect pipes (7) are arranged at equal intervals in the circumferential direction of the shuttle bed (4); the shuttle plate (2) is provided with a plurality of Venturi effect pipes (7) connected to the second slot section (602), and the plurality of Venturi effect pipes (7) are arranged at equal intervals in the circumferential direction of the shuttle plate (2).

9. The rotary hook for cooling based on the Venturi effect according to claim 5, characterized in that: The first port (701) of the Venturi effect pipe (7) on the shuttle bed (4) is located on the outer peripheral surface of the shuttle bed (4); the first port (701) of the Venturi effect pipe (7) on the shuttle plate (2) is located on the outer peripheral surface of the shuttle plate (2).

10. A sewing machine, characterized in that: The invention comprises a rotary hook for cooling based on the Venturi effect as claimed in any one of claims 1 to 9.

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