Rotary hook oil supply system, lower machine head and sewing machine

Abstract

The invention relates to a rotary hook oil supply system, a lower machine head and a sewing machine. The rotary hook oil supply system comprises a rotatably mounted rotary hook shaft, wherein an internal oil passage is constructed in the rotary hook shaft, wherein the internal oil passage is inclined to the rotation center axis of the rotary hook shaft, and one end of the internal oil passage penetrates the end of the rotary hook shaft to form an outlet; the rotary hook shaft is also constructed with an oil through hole, wherein the oil through hole is connected to the internal oil passage, and at least one end of the oil through hole penetrates the side wall of the rotary hook shaft to form an inlet, wherein the inlet is used to connect to an oil tank; the rotary hook oil supply system also comprises an oil guide line, wherein the oil guide line is arranged in the internal oil passage; the rotary hook oil supply system can realize active oil supply simply and at low cost, and the oil supply amount can be automatically adjusted according to the rotation speed of the rotary hook, thereby meeting the lubrication requirements of the rotary hook at different rotation speeds, and can effectively solve the deficiencies existing in the prior art, and is particularly suitable for sewing equipment such as high-speed sewing machines and computerized pattern sewing machines.

Description

Technical Field

[0001] The invention relates to the technical field of sewing equipment, and in particular to a rotary hook oil supply system, a lower machine head and a sewing machine. Background Art

[0002] Sewing machines are commonly used sewing equipment and are widely used in the sewing industry. At present, there are various types of sewing machines (for example, including computer sewing machines with 360-degree rotating heads (or called 360-degree rotating perfect stitch sewing machines, computer pattern template sewing machines)), but sewing machines of various structures usually include an upper head, a lower head that cooperates with the upper head, and a sewing platform for placing sewing materials flat, wherein the upper head is the main part of the sewing machine, usually composed of four mechanisms of piercing, hooking, picking up, and feeding, as well as auxiliary mechanisms such as winding, pressing, and dropping teeth. The upper head is usually arranged above the sewing platform; the lower head usually includes a rotary shuttle mechanism, and the rotary shuttle mechanism is usually arranged below the sewing platform and corresponds to the position of the upper head, and the rotary shuttle mechanism cooperates with the upper head (specifically cooperates with the needle of the upper head) to smoothly complete the sewing work.

[0003] The rotary hook mechanism is an important component of a sewing machine. The existing rotary hook mechanism usually includes a motor, a rotary hook shaft and a rotary hook, wherein the rotary hook is usually fixed to one end of the rotary hook shaft and is arranged at the position corresponding to the machine needle so as to cooperate with the machine needle; the motor is used to drive the rotary hook shaft to rotate to drive the rotary hook to rotate, and the rotary hook cooperates with the machine needle that reciprocates up and down through rotation to achieve the purpose of hooking the thread and guiding the sewing thread to form a stitch.

[0004] In the actual sewing process, since the needle reciprocates up and down once, the shuttle needs to rotate twice, so the shuttle usually has a higher rotation speed. The higher the rotation speed, the greater the friction. Especially in high-speed sewing machines, the rotation speed of the shuttle is higher, there is a lot of friction, and it is easy to heat up. Therefore, it is usually necessary to supply lubricating oil to the shuttle to lubricate the shuttle to ensure that the sewing machine is in good working condition; in the prior art, active oil supply is usually used to transport lubricating oil to the shuttle, but this oil supply method usually requires the installation of special power components to provide oil supply power, such as the installation of oil supply pumps, plungers and other components, which has the problems of complex structure and high cost; a shuttle oil supply mechanism disclosed in Chinese patent CN 2020220050714 can realize the lubrication function of the shuttle, but it is found in the actual operation process that active oil supply cannot be realized, and the output of lubricating oil is uncontrollable, which does not meet the lubrication requirements of the shuttle that the larger the rotation speed of the shuttle, the larger the amount of lubricating oil required, which is not conducive to achieving better lubrication effect and needs to be solved urgently. Summary of the invention

[0005] The first aspect of the present invention aims to solve the problem that in order to realize active oil supply in the existing sewing machine, a special power component must be installed, which has the disadvantages of complex structure and high cost, and the problem that active oil supply cannot be realized without installing a special power component, and the oil supply amount does not meet the lubrication requirement of the rotary hook. A rotary hook oil supply system is provided, which can not only realize active oil supply simply and at low cost without setting an additional power component, but also the oil supply amount can be automatically adjusted according to the rotation speed of the rotary hook, which meets the lubrication requirement of the rotary hook. The main concept is:

[0006] A rotary hook oil supply system comprises a rotatably mounted rotary hook shaft, wherein an internal oil passage is constructed in the rotary hook shaft, and the internal oil passage is inclined to the rotation center axis of the rotary hook shaft, and one end of the internal oil passage passes through the end of the rotary hook shaft to form an outlet;

[0007] The rotary hook shaft is also configured with an oil hole, the oil hole is connected to the internal oil channel, and at least one end of the oil hole penetrates the side wall of the rotary hook shaft to form an inlet, which is used to communicate with the oil tank;

[0008] It also includes an oil guide line, which is arranged in the internal oil channel. In this scheme, an internal oil channel is constructed in the rotary hook shaft, and one end of the internal oil channel passes through the end of the rotary hook shaft to form an outlet, and an oil hole is constructed, the oil hole is connected to the internal oil channel, and at least one end of the oil hole passes through the side wall of the rotary hook shaft to form an inlet. After assembly, the inlet is connected to the oil tank, so that a complete oil supply path can be formed, so that the lubricating oil in the oil tank can flow out from the outlet at one end of the rotary hook shaft through the inlet, the oil hole, and the internal oil channel, so as to directly act on the rotary hook installed at this end, so as to achieve the purpose of lubricating and cooling the rotary hook; by constructing the internal oil channel to be inclined to the rotation center axis of the rotary hook shaft, on the one hand, the lubricating oil in the internal oil channel is not at the rotation center of the rotary hook shaft, when the rotary hook shaft When rotating, centrifugal force is generated on the lubricating oil in the internal oil channel. Since the side walls of the internal oil channel are inclined, this centrifugal force drives the lubricating oil to press against the side walls of the internal oil channel, and at the same time, a stress component is generated along the length direction of the internal oil channel. This stress component can drive the lubricating oil to move along the length direction of the internal oil channel, so that the rotation of the rotary hook shaft itself can be used to provide output power for the lubricating oil without setting up additional power components, thereby solving the problem of low-cost active oil supply; and the rotation speed of the rotary hook shaft is proportional to the centrifugal force, and the problem that the greater the rotation speed of the rotary hook shaft, the greater the lubricating oil output; on the other hand, the greater the inclination angle of the internal oil channel, the greater the oil supply, and the accurate control of the lubricating oil output can be solved by controlling the inclination angle of the internal oil channel The problem of lubrication can be solved, which is beneficial to meeting different lubrication needs and has stronger versatility. By arranging an oil guide line in the internal oil channel, on the one hand, the oil guide line can absorb and guide oil. When the rotary hook shaft is in a stationary state, the oil guide line can effectively prevent the lubricating oil in the internal oil channel from flowing out of the internal oil channel, which can solve the problem of lubricating oil leakage in the stationary state of the rotary hook. On the other hand, when the rotary hook shaft is in a rotating state, the oil guide line rotates with the rotary hook shaft, and a swinging effect is formed in the internal oil channel. By cooperating with the inclined internal oil channel, the oil swinging effect can be achieved, so that the lubricating oil can flow out of the internal oil channel smoothly and efficiently along the oil guide line, which can not only solve the problem of automatic and active oil supply without additional power components. The problem is solved, so that the lubricating oil can be smoothly output to the outlet, and the greater the speed of the shuttle shaft and the greater the throwing force, the greater the oil output, which solves the problem of meeting the different lubrication needs of the sewing machine shuttle at different speeds. In addition, after setting the oil guide line in the internal oil channel, the problem of insufficient power of the lubricating oil at a low speed of the shuttle shaft and the inability to output the internal oil channel can also be solved, so that the shuttle oil supply system can realize active oil supply at any speed, and the greater the speed, the greater the oil supply. Compared with the existing shuttle lubrication system / mechanism, the shuttle oil supply system can realize active oil supply simply and at low cost, and the oil supply can be automatically adjusted according to the speed of the shuttle, so as to meet the lubrication needs of the shuttle at different speeds, and has outstanding substantial characteristics and significant progress.

[0009] In order to solve the problem that the rotation of the rotary hook shaft itself can provide output power for the lubricating oil in the outlet direction, preferably, the distance of the internal oil channel from the rotation center axis of the rotary hook shaft gradually increases along the direction from the lubricating oil entering the internal oil channel to leaving the internal oil channel. That is, along the flow direction of the lubricating oil, the distance between the internal oil channel and the rotation center axis of the rotary hook shaft gradually increases, so that when the rotary hook shaft rotates, a stress component is generated along the length direction of the internal oil channel and consistent with the flow direction of the lubricating oil. This stress component can achieve the purpose of conveying the lubricating oil, and the greater the rotation speed, the greater the stress component, which is more conducive to realizing automatic and active oil supply; at the same time, in conjunction with the oil guide line, better oil supply and lubrication effects can be achieved.

[0010] In order to solve the problem of facilitating the processing of the internal oil channel, preferably, the internal oil channel is a cylindrical channel, which is convenient for processing and forming.

[0011] In order to allow the lubricating oil to enter the internal oil channel more smoothly in the rotating state, preferably, the rotation center of the rotary hook shaft is located in the internal oil channel at the position where the internal oil channel is connected to the oil hole. This can effectively reduce or eliminate the centrifugal force on the lubricating oil at this position in the rotating state, which is conducive to the lubricating oil entering the internal oil channel more smoothly through the oil hole.

[0012] The second aspect of the present invention aims to solve the problem of restraining the oil guide wire and preventing it from falling off. Preferably, one end of the oil guide wire is restrained in the internal oil passage or stuck in the oil hole, and the other end extends to the outlet. This is convenient for assembling the oil guide wire and can effectively restrain the oil guide wire and prevent it from falling off.

[0013] Preferably, the end of the oil guide wire away from the outlet is stuck in the position where the oil hole and the internal oil channel are connected by tying a knot, which can effectively restrain the oil guide wire without setting up additional parts, and can solve the problem of preventing the oil guide wire from falling off at a low cost.

[0014] Preferably, the oil-conducting thread is a cotton thread, which is more conducive to absorbing and conducting oil.

[0015] To facilitate the processing and forming of the oil hole, preferably, both ends of the oil hole penetrate the side wall of the rotary hook shaft respectively; and / or, the oil hole is a cylindrical hole; and / or, the length direction of the oil hole is perpendicular to the rotation center axis of the rotary hook shaft. It is convenient to process and form the oil hole in one step, which is conducive to reducing the process difficulty and cost.

[0016] Preferably, the inner diameter of the oil hole is larger than the inner diameter of the internal oil passage, which is convenient for setting the oil guide line and forming a larger cavity, which is more conducive to the lubricating oil flowing into the oil hole.

[0017] The third aspect of the present invention is to solve the problem of achieving continuous oil supply during the rotation of the rotary hook shaft, and further comprises a fixedly installed oil tank, the oil tank being configured with an internal oil chamber for storing lubricating oil;

[0018] At least part of the shaft section of the rotary hook shaft is located in the internal oil chamber, and the oil hole is constructed in the part of the shaft section. By setting up an oil tank and constructing the internal oil chamber in the oil tank, the storage problem of lubricating oil can be solved, and conditions for the communication between the internal oil passage and the internal oil chamber can be provided; by constructing the oil hole on the shaft section of the rotary hook shaft located in the internal oil chamber, the formed inlet is located in the internal oil chamber, so that during the rotation of the rotary hook shaft, the oil hole rotates with the rotary hook shaft, and the oil hole is always in the internal oil chamber, so that the oil hole and the internal oil chamber can always maintain a communication state, and because the oil hole is connected to the internal oil passage, during the rotation of the rotary hook shaft, the internal oil passage can be connected to the internal oil passage through the oil hole, which can solve the problem of the internal oil passage being connected to the internal oil chamber, and solve the problem of continuous and uninterrupted oil supply during the rotation of the rotary hook shaft; in addition, in actual application, the internal oil chamber of the oil tank can maintain a vacuum state, and the internal lubricating oil will not flow out without the action of external suction, which has the effect of preventing oil leakage.

[0019] The fourth aspect of the present invention aims to solve the problem of overcoming the centrifugal force generated by the rotation of the rotary hook shaft and utilizing the rotation of the rotary hook shaft to actively output the lubricating oil in the oil tank. In the first scheme, the rotary hook shaft is also constructed with a guide portion that cooperates with the oil through hole, and the guide portion is connected to the oil through hole, and a guide gap is formed on one side of the oil through hole, and a blocking surface is formed on the other side of the oil through hole at the position corresponding to the guide gap. In the present solution, since the guide part is constructed on the rotary hook shaft and is connected to the oil through hole, the guide part can form a guide gap on one side of the oil through hole, and the guide gap is used to accommodate lubricating oil, so that the lubricating oil in the internal oil chamber can smoothly enter the guide gap, which can solve the problem that the lubricating oil in the internal oil chamber cannot smoothly enter the rotary hook shaft due to the centrifugal force generated during the rotation of the rotary hook shaft; at the same time, the guide part also forms a blocking surface on the other side of the oil through hole and at the position of the guide gap, and the blocking surface is used to block the lubricating oil in the guide gap. During the rotation of the rotary hook shaft, the blocking surface can prevent the lubricating oil in the guide gap from flowing out of the guide gap, and can also apply thrust to the lubricating oil in the guide gap. The cooperation of the notch and the rotation of the hook shaft can form an effect similar to that of a centripetal turbine. During the rotation of the hook, the lubricating oil near the hook can be continuously pumped into the oil hole, thereby realizing the effect of actively supplying the lubricating oil in the internal oil chamber into the hook shaft by the rotation of the hook. This can not only effectively solve the problem that the lubricating oil in the internal oil chamber cannot smoothly enter the oil hole due to the centrifugal force generated during the rotation of the hook shaft, but also solve the problem of actively outputting the lubricating oil in the oil tank by the rotation of the hook shaft. Moreover, since the greater the rotation speed of the hook shaft, the more lubricating oil is pumped into the hook shaft, the problem of automatically controlling the output oil volume by controlling the rotation speed of the rotating shaft can also be solved, thereby better meeting the lubrication needs of the hook at different rotation speeds.

[0020] Preferably, the guide portion is constructed on one side of the oil passage hole, and the guide portion is a guide groove or a guide hole.

[0021] Preferably, the guide portion is arranged along the circumferential direction of the rotary hook shaft so as to cooperate with the rotation of the rotary hook shaft, so that the lubricating oil can be driven into the guide portion more easily during the rotation of the rotary hook shaft.

[0022] Preferably, the guide portion is a guide groove, the guide groove comprises a bottom surface connected to the inner wall surface of the oil hole, and side surfaces constructed on both sides of the bottom surface and connected to the inner wall surface of the oil hole, and the blocking surface is the inner wall surface of the oil hole corresponding to the guide notch;

[0023] And / or, both ends of the oil-through hole respectively penetrate the side wall of the rotary hook shaft and form two inlets respectively, the two inlets are respectively provided with the guide parts, and the two guide parts are distributed symmetrically with respect to the center.

[0024] Preferably, the bottom surface is a plane, and the bottom surface is perpendicular to the central axis of the oil hole; and / or the side surfaces are respectively perpendicular to the bottom surface, so as to facilitate processing and molding.

[0025] In the second solution, the rotary hook shaft is also constructed with a blocking portion that matches the oil hole. The blocking portion is constructed on one side of the inlet and protrudes from the side wall of the rotary hook shaft, and is used to drive the lubricating oil outside the inlet into the inlet during the rotation of the rotary hook shaft. In this solution, since the blocking portion protrudes from the side wall of the rotary hook shaft, during the rotation of the rotary hook shaft, the blocking portion and the side wall of the rotary hook shaft can produce a centripetal turbine-like effect, so that along the direction of rotation, there is always lubricating oil between the blocking portion and the side wall of the rotary hook shaft. The blocking portion is constructed on one side of the inlet, so that during the rotation of the rotary hook shaft, the lubricating oil between the blocking portion and the side wall of the rotary hook shaft can be continuously driven into the inlet during the rotation, thereby effectively solving the problem that the centrifugal force generated during the rotation of the rotary hook shaft causes the lubricating oil in the internal oil chamber to fail to enter the oil hole smoothly.

[0026] Preferably, the blocking portion is a plate-shaped structure so as to function as a guide vane.

[0027] The fifth aspect of the present invention aims to solve the problem of controlling the output amount of lubricating oil in the oil tank, and also includes a fixedly installed restraining component, the restraining component is configured with a central hole for passing the rotary hook shaft, and the side wall of the restraining component is configured with at least one connecting hole connected to the central hole, the connecting hole is used to connect to the oil tank,

[0028] The constraint component is sleeved on the rotary hook shaft, and the oil hole can be connected with the connecting hole through the rotation of the rotary hook shaft. In this scheme, by setting the constraint component, the constraint component and the rotary hook shaft can form a rotating pair, which can constrain and support the rotary hook shaft, so that the rotary hook shaft can rotate under the drive of the motor, so as to achieve the purpose of motion separation; because the rotary hook shaft will drive the oil hole to rotate synchronously when it rotates, the oil hole can rotate relative to the connecting hole and achieve periodic connection, which can not only accurately control the output of the lubricating oil in the oil tank by periodic connection, but also because the rotary hook shaft is provided with the oil hole and the internal oil channel, a cavity structure can be formed, and by utilizing the rotation of the rotary hook shaft, when the oil hole is connected with the connecting hole, the lubricating oil can enter the rotary hook shaft, and in the gap where the oil hole and the connecting hole are not connected, the lubricating oil entering the rotary hook shaft can be transported in the direction of the forced outlet of the rotary hook shaft, so as to provide space for the lubricating oil entering later, and a negative pressure can be formed, so that when the oil hole and the connecting hole are connected again, the negative pressure is more conducive to the external lubricating oil entering the rotary hook shaft, and such a cycle can achieve active The lubricating oil output effect is good; in addition, when the rotary hook shaft rotates to the set position, the guide part constructed on the rotary hook shaft is first connected with the connecting hole in the constraint component, so that the lubricating oil in the internal oil chamber can enter the guide part through the connecting hole. Due to the characteristics of the guide part, as the rotary hook shaft continues to rotate, the lubricating oil in the guide part can be continuously driven into the oil hole, and the lubricating oil in the internal oil chamber can also continuously enter the guide part until the guide part and the connecting hole are no longer connected. It can be seen that by constructing the guide part, not only the connection time between the oil hole and the connecting hole is extended, but also it is more conducive to the lubricating oil entering the oil hole smoothly under high speed, so as to achieve the purpose of automatic oil supply at high speed, and, through the intermittent cooperation between the guide part and the connecting hole, it is more conducive to using the rotation of the rotary hook shaft to continuously suck the lubricating oil in the internal oil chamber into the rotary hook shaft, which can not only realize active oil supply, but also use the rotation of the rotary hook shaft to automatically control the amount of output oil, so as to achieve good lubrication effect at different speeds.

[0029] Preferably, the restraining component is a shaft sleeve or a sleeve, so as to form a rotating pair with the rotary hook shaft.

[0030] Preferably, there are two communicating holes, and the two communicating holes are symmetrically arranged on the restraining component.

[0031] To make the structure more compact, preferably, the constraint component is fixedly installed in the oil tank, and the communication hole is connected to the internal oil cavity in the oil tank. That is, the constraint component can be directly set in the oil tank, so that the constraint component and the oil tank can be connected without an additional pipeline.

[0032] A lower head for a sewing machine, comprising the rotary hook oil supply system,

[0033] It also includes a seat body, the oil tank is arranged on the seat body, and the rotary hook shaft is rotatably arranged on the oil tank and / or the seat body.

[0034] The rotary hook is installed at the outlet end of the rotary hook shaft.

[0035] The motor is installed on the seat body and is used to drive the rotary hook shaft to rotate. When working, the motor can drive the rotary hook to rotate so as to cooperate with the up and down reciprocating motion of the needle and perform thread hooking and thread guiding to form a stitch. In this process, the rotary hook oil supply system can realize automatic oil supply according to the rotation of the rotary hook shaft to achieve the purpose of lubricating the rotary hook.

[0036] Furthermore, the oil tank is detachably mounted on the seat body, or the oil tank and the seat body are integrally formed components. In particular, when an integrally formed component is used, the overall structure is more compact.

[0037] A sewing machine comprises the rotary hook oil supply system or the lower machine head.

[0038] Compared with the prior art, the use of a rotary hook oil supply system, a lower head and a sewing machine provided by the present invention can realize active oil supply simply and at low cost, and the oil supply amount can be automatically adjusted according to the rotation speed of the rotary hook to meet the lubrication requirements at different rotation speeds of the rotary hook. It can effectively solve the shortcomings of the prior art and is particularly suitable for sewing equipment such as high-speed sewing machines and computer pattern sewing machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 This is a schematic structural diagram of a rotary hook shaft provided in Example 1 of the present invention.

[0041] Figure 2 for Figure 1 Cross-sectional view at AA in the middle.

[0042] Figure 3 for Figure 1 Cross-sectional view at the middle BB.

[0043] Figure 4 This is a cross-sectional view of a rotary hook oil supply system provided in Example 1 of the present invention, after an oil guide line is set in the rotary hook shaft.

[0044] Figure 5This is a partial cross-sectional view of a rotary hook oil supply system provided in Example 1 of the present invention.

[0045] Figure 6 This is a schematic diagram of the structure of a constraint component provided in Example 2 of the present invention.

[0046] Figure 7 This is a partial cross-sectional view of a rotary hook oil supply system provided in Example 2 of the present invention.

[0047] Figure 8 for Figure 7 Cross-sectional view at CC.

[0048] Fig. 9 This is a schematic structural diagram of a rotary hook shaft provided in Example 3 of the present invention.

[0049] Fig.10 for Fig. 9 A partial top view of .

[0050] Fig.11 for Fig.10 Cross-sectional view at DD in the middle.

[0051] Fig.12 This is a schematic diagram of a rotary hook shaft provided in Example 3 of the present invention, which guides lubricating oil into the internal oil channel during rotation, wherein the dotted line with an arrow is the flow path of the lubricating oil, and the solid line with an arrow is the rotation direction of the rotary hook shaft.

[0052] Fig.13 This is one of the partial cross-sectional views of a rotary hook oil supply system provided in Example 3 of the present invention.

[0053] Fig.14 for Fig.13 Cross-sectional view at EE in the middle.

[0054] Fig.15 This is the second partial cross-sectional view of a rotary hook oil supply system provided in Example 3 of the present invention.

[0055] Fig.16 This is a partial top view of a rotary hook shaft provided in Example 4 of the present invention.

[0056] Fig.17 for Fig.16 Cross-sectional view at FF.

[0057] Fig.18 This is a partial top view of another rotary hook shaft provided in Example 4 of the present invention.

[0058] Fig.19 for Fig.18 Cross-sectional view at GG in the middle.

[0059] Fig. 20 This is a partial top view of a lower machine head provided in Example 5 of the present invention.

[0060] Description of symbols in the figure

[0061] Rotating hook shaft 100, internal oil passage 101, rotation center axis 102, outlet 103, oil hole 104, inlet 105, side wall 106 of rotating hook shaft, flow guide notch 107, blocking surface 108, inner wall surface 109 of oil hole, bottom surface 110, side surface 111, blocking portion 112, side wall 113

[0062] Mailbox 200, internal oil chamber 201, seat body 202, oil guide line 300

[0063] Constraint component 400, center hole 401, connecting hole 402, sealing ring 403

[0064] Driven pulley 501 , transmission belt 502 , and bearing 600 . DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0066] Example 1

[0067] See also Figure 1-Figure 5 In this embodiment, a rotary hook oil supply system is provided, comprising a rotary hook shaft 100, an oil guide line 300, a rotatably mounted rotary hook shaft 100 and a fixedly mounted oil tank 200, wherein:

[0068] like Figure 1-Figure 5As shown, an internal oil passage 101 is constructed in the rotary hook shaft 100, and the internal oil passage 101 is inclined to the rotation center axis 102 of the rotary hook shaft 100. One end of the internal oil passage 101 passes through the end of the rotary hook shaft 100 and forms an outlet 103 for the lubricating oil to flow out. By constructing the internal oil passage 101 to be inclined to the rotation center axis 102 of the rotary hook shaft 100, on the one hand, the lubricating oil in the internal oil passage 101 is not located at the rotation center of the rotary hook shaft 100. When the rotary hook shaft 100 rotates, centrifugal force is generated on the lubricating oil in the internal oil passage 101. Since the side wall of the internal oil passage 101 is inclined, the centrifugal force drives the lubricating oil to press against the side wall of the internal oil passage 101, and also generates a centrifugal force along the length of the internal oil passage 101. The stress component in the direction can drive the lubricating oil to move along the length direction of the internal oil channel 101, so that the rotation of the rotary hook shaft 100 itself can be used to provide output power for the lubricating oil without setting up additional power components, thereby solving the problem of low-cost active oil supply; and the rotation speed of the rotary hook shaft 100 is proportional to the centrifugal force, and the problem that the greater the rotation speed of the rotary hook shaft 100, the greater the lubricating oil output; on the other hand, the greater the inclination angle of the internal oil channel 101, the greater the oil supply. In specific implementation, the inclination angle of the internal oil channel 101 can be determined according to actual needs, so as to solve the problem of accurately controlling the lubricating oil output by controlling the inclination angle of the internal oil channel 101, which is conducive to meeting different lubrication needs and has stronger versatility.

[0069] In a preferred embodiment, Figure 1-Figure 5 As shown in FIG. 1 , along the direction from when the lubricating oil enters the internal oil passage 101 to when it leaves the internal oil passage 101 (i.e., the outlet 103), the distance of the internal oil passage 101 from the rotation center axis 102 of the rotary hook shaft 100 gradually increases, as shown in FIG. Figure 3 and Figure 4 As shown, that is, along the flow direction of the lubricating oil, the distance between the internal oil channel 101 and the rotation center axis 102 of the rotary hook shaft 100 gradually increases, so that when the rotary hook shaft 100 rotates, a stress component is generated along the length direction of the internal oil channel 101 and consistent with the flow direction of the lubricating oil. This stress component can serve the purpose of conveying the lubricating oil, and the greater the rotation speed, the greater the stress component, which is more conducive to realizing automatic and active oil supply; at the same time, in conjunction with the oil guide line 300, better oil supply and lubrication effects can be achieved.

[0070] The cross-sectional shape of the internal oil passage 101 can be determined according to actual needs. In a preferred embodiment, the internal oil passage 101 can preferably be a cylindrical passage, such as Figure 3 and Figure 4 As shown, the processing and forming of the internal oil passage 101 is facilitated.

[0071] like Figure 1-Figure 5As shown, the rotary hook shaft 100 is also configured with an oil hole 104, which is connected to the internal oil passage 101, and at least one end of the oil hole 104 penetrates the side wall 106 of the rotary hook shaft to form an inlet 105, which is used to communicate with the oil tank 200, thereby forming a complete oil supply path, so that the lubricating oil in the oil tank 200 can flow out from the outlet 103 at one end of the rotary hook shaft 100 via the inlet 105, the oil hole 104, and the internal oil passage 101, so as to directly act on the rotary hook installed at this end, so as to achieve the purpose of lubricating and cooling the rotary hook; as an example, in this embodiment, the two ends of the oil hole 104 respectively penetrate the side wall 106 of the rotary hook shaft, as shown in FIG. Figure 3 and Figure 4 As shown, for the convenience of processing and forming, the oil hole 104 can preferably be a cylindrical hole (of course, the oil hole 104 can also be a square hole, etc., which will not be illustrated here one by one), and the length direction of the oil hole 104 can be perpendicular to the rotation center axis 102 of the rotary hook shaft 100, such as Figure 3 The diameter of the oil hole 104 can be determined according to actual needs. For example, Figure 3 As shown, the inner diameter of the oil hole 104 is larger than the inner diameter of the internal oil passage 101 , which is convenient for setting the oil guide line 300 and forming a larger cavity, which is more conducive to the lubricating oil flowing into the oil hole 104 .

[0072] In a specific implementation, the oil hole 104 can be connected to the internal oil passage 101 at any position, that is, the distance between the oil hole 104 and the outlet 103 can be manually controlled. In a preferred embodiment, at the position where the internal oil passage 101 is connected to the oil hole 104, the rotation center of the rotary hook shaft 100 is located in the internal oil passage 101, such as Figure 2 As shown in FIG. 1 , as a special embodiment, at the position where the internal oil passage 101 is connected to the oil hole 104, the rotation center of the rotary hook shaft 100, the geometric center of the oil hole 104 and the geometric center of the cross section of the rotary hook shaft 100 coincide with each other, as shown in FIG. Figure 2 As shown, the centrifugal force exerted on the lubricating oil at this position in the rotating state can be effectively reduced or eliminated, which is conducive to the lubricating oil entering the internal oil channel 101 more smoothly through the oil hole 104.

[0073] In addition, in this embodiment, if Figure 1-Figure 5As shown, an oil guide line 300 is further provided in the internal oil passage 101. By providing the oil guide line 300 in the internal oil passage 101, on the one hand, the oil guide line 300 can play the role of oil absorption and oil guidance. When the rotary hook shaft 100 is in a stationary state, the oil guide line 300 can effectively prevent the lubricating oil in the internal oil passage 101 from flowing out of the internal oil passage 101, and can solve the problem of lubricating oil leakage in the stationary state of the rotary hook; on the other hand, when the rotary hook shaft 100 is in a rotating state, the oil guide line 300 rotates with the rotary hook shaft 100. , and a shaking effect will be formed in the internal oil channel 101. By cooperating with the inclined internal oil channel 101, the oil shaking effect can be achieved, so that the lubricating oil can flow out of the internal oil channel 101 smoothly and efficiently along the oil guide line 300, which can not only solve the problem of automatic and active oil supply without additional power components, so that the lubricating oil can be smoothly output from the outlet 103, but also the greater the rotation speed of the shuttle shaft 100 and the greater the shaking force, the greater the oil output, which solves the problem of meeting the different lubrication requirements of the sewing machine shuttle at different rotation speeds.

[0074] In order to constrain the oil guide wire 300 and prevent the oil guide wire 300 from falling off, it is necessary to constrain the end of the oil guide wire 300 away from the outlet 103 in one direction. In a preferred embodiment, one end of the oil guide wire 300 can be constrained in the internal oil passage 101 and can be stuck in the oil hole 104 (that is, stuck at the intersection of the internal oil passage 101 and the oil hole 104, such as Figure 4 As shown in the figure, the other end extends to the outlet 103, and it can extend out of the outlet 103 or not. In order to clamp one end of the oil guide line 300 in the oil hole 104, there are multiple implementation methods. As an example, the end of the oil guide line 300 away from the outlet 103 can be clamped in the position where the oil hole 104 and the internal oil channel 101 are connected by tying a knot, which can effectively restrain the oil guide line 300 without setting up additional components, and can solve the problem of preventing the oil guide line 300 from falling off at a low cost.

[0075] The oil guide wire 300 may be a wire commonly used in the prior art. Preferably, in the present embodiment, the oil guide wire 300 preferably uses a cotton thread, which is more conducive to the role of oil absorption and oil conduction.

[0076] In this embodiment, the oil tank 200 is configured with an internal oil chamber 201 for storing lubricating oil. Figure 5 As shown, by providing an oil tank 200 and constructing an internal oil chamber 201 in the oil tank 200, the storage problem of lubricating oil can be solved, and conditions for the communication between the internal oil passage 101 and the internal oil chamber 201 can be provided; in order to realize continuous oil supply during the rotation of the rotary hook shaft 100, at least a part of the shaft section of the rotary hook shaft 100 is located in the internal oil chamber 201, and the oil hole 104 is constructed in the part of the shaft section. For example, Figure 5 As shown, the shaft section of the middle part of the rotary hook shaft 100 is exactly located in the internal oil chamber 201, and the oil hole 104 is exactly constructed in the shaft section. Figure 5 As shown, the formed inlet 105 is located exactly in the internal oil chamber 201. During the rotation of the rotary hook shaft 100, the oil hole 104 rotates with the rotary hook shaft 100, and the oil hole 104 is always in the internal oil chamber 201, so that the oil hole 104 and the internal oil chamber 201 can always maintain a connected state. Since the oil hole 104 is connected to the internal oil passage 101, during the rotation of the rotary hook shaft 100, the internal oil passage 101 can always maintain a connected state with the internal oil passage 101 through the oil hole 104, which can solve the problem of the internal oil passage 101 being connected to the internal oil chamber 201 and the problem of continuous and uninterrupted oil supply during the rotation of the rotary hook shaft 100. In addition, in actual application, the internal oil chamber 201 of the oil tank 200 can maintain a vacuum state. In the absence of external suction, the internal lubricating oil will not flow out, which has the effect of preventing oil leakage.

[0077] The specific structure and shape of the oil tank 200 can be determined according to actual needs, and this embodiment is not limited thereto, as long as it can accommodate and store lubricating oil. In order to realize the rotatable installation of the rotary hook shaft 100, there are many implementation methods. As an example, the rotary hook shaft 100 can be rotatably installed on the oil tank 200 through a bearing 600, and sealed with a sealing ring 403 to prevent oil leakage, such as Figure 5 As shown, both ends of the rotary hook shaft 100 are respectively located outside the oil tank 200, so that the rotary hook is installed at one end of the rotary hook shaft 100 having the outlet 103, and the other end of the rotary hook shaft 100 is connected to a motor so that the rotary hook shaft 100 is driven to rotate by the motor.

[0078] In order to facilitate the addition of lubricating oil, the oil tank 200 is also constructed with an oil filling hole for refueling and a sealing cover for closing the oil filling hole; in order to facilitate checking the amount of lubricating oil in the oil tank 200, the oil tank 200 is also constructed with an oil window for checking the oil amount, and the oil window can preferably be made of light-transmitting materials such as plastic and glass.

[0079] Example 2

[0080] In order to solve the problem of controlling the output amount of lubricating oil in the oil tank 200, the rotary hook oil supply system provided in this embodiment 2 also includes a fixedly installed restraining component 400, such as Figure 6As shown, the restraining member 400 is configured with a central hole 401 for passing the rotary hook shaft 100, and the side wall of the restraining member 400 is configured with at least one connecting hole 402 connected to the central hole 401, and the connecting hole 402 is used to connect to the oil tank 200; and the restraining member 400 is sleeved on the rotary hook shaft 100, so that the oil hole 104 can be connected to the connecting hole 402 through the rotation of the rotary hook shaft 100, as shown in FIG. Figure 6-Figure 8 As shown, the constraint component 400 and the rotary hook shaft 100 can form a rotating pair, which can constrain and support the rotary hook shaft 100, so that the rotary hook shaft 100 can rotate under the drive of the motor, thereby achieving the purpose of motion separation; because the rotary hook shaft 100 will drive the oil hole 104 to rotate synchronously when it rotates, the oil hole 104 can rotate relative to the connecting hole 402 and achieve periodic communication, not only can the output amount of the lubricating oil in the oil tank 200 be accurately controlled by the periodic communication, but also because the rotary hook shaft 100 is provided with the oil hole 104 and the internal oil channel 101 inside, a cavity structure can be formed, and the rotation of the rotary hook shaft 100 can be used to control the lubricating oil output in the oil tank 200. When the oil hole 104 is connected with the connecting hole 402, the lubricating oil can enter the rotary hook shaft 100. In the gap where the oil hole 104 and the connecting hole 402 are not connected, the lubricating oil entering the rotary hook shaft 100 can be transported in the direction of the forced outlet 103 of the rotary hook shaft 100, so as to provide space for the lubricating oil entering later, and a negative pressure can be formed, so that when the oil hole 104 and the connecting hole 402 are connected again, the negative pressure is more conducive to sucking the lubricating oil in the oil tank 200 into the rotary hook shaft 100. In this cycle, the rotation of the rotary hook shaft 100 can be used to achieve the effect of actively outputting the lubricating oil in the oil tank 200, thereby achieving the purpose of active oil supply.

[0081] In this embodiment, the restraining component 400 has various implementations. Preferably, the restraining component 400 can be preferably a sleeve or a sleeve so as to form a rotating pair with the rotary hook shaft 100; for example, Figure 6 As shown, the restraining component 400 is a sleeve, which can significantly reduce the friction between the restraining component 400 and the rotary hook shaft 100 by cooperating with the rotary hook shaft 100, which is beneficial to reducing power consumption.

[0082] The shape of the connecting hole 402 can be determined according to actual needs. A round hole or a square hole that matches the oil hole 104 can be preferably used. The number of the connecting holes 402 can be one, two or more. For example, Figure 6-Figure 8As shown, there are two communicating holes 402, and the two communicating holes 402 are symmetrically arranged on the constraint component 400, so as to facilitate oil intake from both sides of the constraint component 400, which is beneficial to obtain a larger oil output, more conducive to lubrication, and is particularly suitable for high-speed rotary hook devices; it can be understood that in this embodiment, by reasonably setting the number and size of the communicating holes 402 and the oil holes 104, the oil output of the lubricating oil can be further controlled; in specific implementation, the communicating holes 402 can be connected to the oil tank 200 through a pipeline, or directly connected to the oil tank 200. As an example, in a preferred embodiment, the constraint component 400 can be fixedly installed in the oil tank 200, and the two ends of the constraint component 400 are sealed with sealing rings 403 to prevent oil leakage, such as Figure 6-Figure 8 As shown, the connecting hole 402 is connected to the internal oil chamber 201 in the oil tank 200, that is, the restraining component 400 can be directly set on the oil tank 200, so that the restraining component 400 and the oil tank 200 can be connected without an additional pipeline.

[0083] Example 3

[0084] In order to solve the problem that the centrifugal force generated during the rotation of the rotary hook shaft 100 causes the lubricating oil in the internal oil chamber 201 (i.e., the lubricating oil near the rotary hook shaft 100) to not only not easily enter the oil hole 104 through the inlet 105 when the rotary hook shaft 100 is rotating, but also to be easily thrown away from the rotary hook shaft 100, the main difference between the present embodiment 3 and the above-mentioned embodiment 1 or embodiment 2 is that, in the rotary hook oil supply system provided by the present embodiment, the rotary hook shaft 100 is further configured with a guide portion that cooperates with the oil hole 104, the guide portion is connected to the oil hole 104, and a guide notch 107 is formed on one side of the oil hole 104, such as Figure 9-12 As shown, at the same time, a blocking surface 108 can be formed at the other side of the oil hole 104 and at the position corresponding to the guide gap 107, as shown in FIG. Fig.11As shown in the figure, since the guide part is constructed on the rotary hook shaft 100 and is connected to the oil hole 104, the guide part can form a guide gap 107 on one side of the oil hole 104, and the guide gap 107 is used to accommodate lubricating oil, so that the lubricating oil in the internal oil chamber 201 can smoothly enter the guide gap 107, which can solve the problem that the centrifugal force generated during the rotation of the rotary hook shaft 100 causes the lubricating oil in the internal oil chamber 201 to fail to smoothly enter the rotary hook shaft 100. At the same time, the guide portion further forms a blocking surface 108 at the other side of the oil hole 104, at the position corresponding to the guide notch 107. The blocking surface 108 is used to block the lubricating oil in the guide notch 107. During the rotation of the rotary hook shaft 100, the blocking surface 108 can prevent the lubricating oil in the guide notch 107 from flowing out of the guide notch 107, and can also apply thrust to the lubricating oil in the guide notch 107. Through the rotational cooperation of the blocking surface 108, the guide notch 107 and the rotary hook shaft 100, a centripetal turbine-like effect can be formed. During the rotation of the rotary hook, the lubricating oil near the rotary hook can be continuously driven into the oil hole 104, so as to achieve the effect of actively driving the lubricating oil in the internal oil chamber 201 into the rotary hook shaft 100 by the rotation of the rotary hook, thereby solving the problem of actively outputting the lubricating oil in the oil tank 200 by the rotation of the rotary hook shaft 100. Moreover, since the rotary hook shaft 100 The greater the rotation speed, the more lubricating oil is driven into the rotary hook shaft 100, which can also solve the problem of automatically controlling the output oil amount by controlling the rotation speed of the rotating shaft, and better meet the lubrication needs of the rotary hook at different rotation speeds.

[0085] Specifically, if Figure 9-Figure 15 As shown, the guide portion is configured on one side of the oil hole 104 so as to cooperate with the inner wall of the oil hole 104 to achieve a similar effect as a centripetal turbine. The number of guide portions can match the number of inlets 105. When the rotary hook shaft 100 is configured with one inlet 105, the guide portion can be arranged on one side of the inlet 105. When the rotary hook shaft 100 is configured with two inlets 105, at least one inlet 105 can be configured with the guide portion. For example, Fig.13 and Fig.15 As shown, both ends of the oil hole 104 penetrate the side wall 106 of the rotary hook shaft and form two inlets 105 respectively, and the two inlets 105 are respectively configured with the guide parts, and the two guide parts are distributed symmetrically in the center, as shown in the figure.

[0086] In this embodiment, the guide portion may preferably be a guide groove or a guide hole, and the guide portion is preferably arranged along the circumferential direction of the rotary hook shaft 100, such as Figure 9-12As shown, in order to cooperate with the rotation of the rotary hook shaft 100, the lubricating oil is more easily driven into the guide part during the rotation of the rotary hook shaft 100. As an example, in a preferred embodiment, the guide part is preferably a guide groove, which is arranged along the circumferential direction of the rotary hook shaft 100. The guide groove includes a bottom surface 110 connected to the inner wall surface 109 of the oil hole, and a side surface 111 constructed on both sides of the bottom surface 110 and connected to the inner wall surface 109 of the oil hole. Figure 9-12 As shown, at this time, the blocking surface 108 can be the inner wall surface of the oil hole 104 corresponding to the guide gap 107, such as Figure 9-12 As shown, as an example, the bottom surface 110 can be a plane, and the bottom surface 110 is perpendicular to the central axis of the oil hole 104. At this time, the side surfaces 111 are respectively perpendicular to the bottom surface 110. Fig.11 As shown, it is convenient for low-cost processing and forming of the guide groove; of course, there are other implementation methods, for example, the bottom surface 110 can be an arcuate surface, the bottom surface 110 can also be not perpendicular to the central axis of the oil hole 104, etc., which will not be explained one by one here.

[0087] It should be noted that when the rotary hook oil supply system provided in this embodiment also includes the restraining component 400 described in Embodiment 2, Figure 13-Figure 15 As shown, since the guide portion provided in the present embodiment is recessed in the side wall 106 of the rotary hook shaft, it will not only not affect the cooperation between the rotary hook shaft 100 and the restraining component 400, but also produce additional technical effects. Specifically, when the rotary hook shaft 100 rotates to the set position, the guide portion constructed on the rotary hook shaft 100 will first communicate with the connecting hole 402 in the restraining component 400, so that the lubricating oil in the internal oil chamber 201 can enter the guide portion through the connecting hole 402. Due to the characteristics of the guide portion, as the rotary hook shaft 100 continues to rotate, the lubricating oil in the guide portion can be continuously driven into the oil hole 104, and the lubricating oil in the internal oil chamber 201 can also continuously enter the guide portion until the guide portion and the connecting hole 402 are no longer connected. It can be seen that by constructing the guide portion, not only the oil hole 104 is extended The length of time of connection with the connecting hole 402 is more conducive to the lubricating oil smoothly entering the oil hole 104 under high speed conditions, thereby achieving the purpose of automatic oil supply at high speed. Moreover, through the intermittent cooperation between the guide portion and the connecting hole 402, it is more conducive to utilizing the rotation of the rotary hook shaft 100 to continuously suck the lubricating oil in the internal oil chamber 201 into the rotary hook shaft 100, which can realize active oil supply and automatically control the output oil amount by utilizing the rotation of the rotary hook shaft 100, so as to achieve a good lubrication effect at different speeds.

[0088] Example 4

[0089] In order to solve the problem that the centrifugal force generated during the rotation of the rotary hook shaft 100 causes the lubricating oil in the internal oil chamber 201 (i.e., the lubricating oil near the rotary hook shaft 100) to not only not easily enter the oil hole 104 through the inlet 105 when the rotary hook shaft 100 is rotating, but also to be easily thrown away from the rotary hook shaft 100, this embodiment 4 provides another technical solution compared with the embodiment 3. Specifically, in the rotary hook oil supply system provided in this embodiment, the rotary hook shaft 100 is further configured with a blocking portion 112 that matches the oil hole 104. The blocking portion 112 is configured on one side of the inlet 105 and protrudes from the side wall 106 of the rotary hook shaft. Fig.16 and Fig.17 As shown, the blocking portion 112 is used to drive the lubricating oil outside the inlet 105 into the inlet 105 during the rotation of the hook shaft 100; the principle is: since the blocking portion 112 protrudes from the side wall 106 of the hook shaft, during the rotation of the hook shaft 100, the blocking portion 112 and the side wall 106 of the hook shaft can produce a centripetal turbine-like effect, so that along the direction of rotation, there is always lubricating oil between the blocking portion 112 and the side wall 106 of the hook shaft, and the blocking portion 112 is constructed on one side of the inlet 105, so that during the rotation of the hook shaft 100, the lubricating oil between the blocking portion 112 and the side wall 106 of the hook shaft can be continuously driven into the inlet 105 during the rotation, thereby effectively solving the problem that the lubricating oil in the internal oil chamber 201 cannot smoothly enter the oil hole 104 due to the centrifugal force generated during the rotation of the hook shaft 100.

[0090] In order to facilitate low-cost implementation, the blocking portion 112 may preferably adopt a plate-shaped structure so as to play the role of a guide vane; preferably, the blocking portion 112 may be a flat plate or an arc-shaped plate that matches the shape of the inlet 105, such as Fig.16 and Fig.17 As shown, the blocking portion 112 is an arc-shaped plate that matches the shape of the inlet 105; in a specific implementation, the blocking portion 112 can be fixed to the side wall 106 of the rotary hook shaft preferably by welding.

[0091] Since in the present embodiment, the blocking portion 112 protrudes from the side wall 106 of the rotary shuttle shaft, the restraining component 400 provided in Example 2 may not be provided. However, in some occasions, when the restraining component 400 provided in Example 2 is required, in order to facilitate the cooperation with the restraining component 400, the center hole 401 in the restraining component 400 may be preferentially constructed as a stepped hole to provide space for the blocking portion 112, so that the restraining component 400 can still be sleeved on the rotary shuttle shaft 100, and the rotary shuttle shaft 100 can drive the blocking portion 112 to rotate relative to the restraining component 400.

[0092] It is understood that the rotary hook shaft 100 can also be configured with the guide portion and the blocking portion 112 at the same time, as shown in FIG. Fig.19 As shown, the guide portion and the blocking portion 112 are respectively located on both sides of the inlet 105, so that the blocking portion 112 can cooperate with the guide portion and can effectively increase the area of ​​the blocking surface 108. For example, a side wall 113 of the blocking portion 112 can be connected to the blocking surface 108, so that during the rotation of the shuttle shaft 100, the blocking portion 112, the blocking surface 108, the side wall 106 of the shuttle shaft and the guide notch 107 can jointly produce an effect similar to a centripetal turbine.

[0093] Example 5

[0094] This embodiment provides a lower head for a sewing machine, including the hook oil supply system described in Embodiment 1, Embodiment 2, Embodiment 3 or Embodiment 4; Fig. 20 As shown, the lower machine head also includes a seat body 202 for supporting, the oil tank 200 can be arranged on the seat body 202, and the rotary hook shaft 100 can be rotatably arranged on the oil tank 200 and / or the seat body 202. In a specific implementation, the rotary hook shaft 100 can be installed on the seat body 202 through a bearing 600, and the oil tank 200 can be detachably installed on the seat body 202, or can be an integrally formed component with the seat body 202. In particular, when the oil tank 200 and the seat body 202 are integrally formed components, it is beneficial for the structure of the entire lower machine head to be more compact and the volume to be more compact.

[0095] The present lower machine head also includes a rotary shuttle that cooperates with the machine needle, and the rotary shuttle is installed at one end of the outlet 103 of the rotary shuttle shaft 100; the present lower machine head also includes a motor, which can be installed on the base body 202, and the motor is used to drive the rotary shuttle shaft 100 to rotate; when working, the motor can drive the rotary shuttle to rotate, so as to cooperate with the up and down reciprocating motion of the machine needle, and to hook the line and guide the line to form a trace. In this process, the rotary shuttle oil supply system can realize automatic oil supply according to the rotation of the rotary shuttle shaft 100, so as to achieve the purpose of lubricating the rotary shuttle.

[0096] It is understood that the motor can be preferably connected to the rotary hook shaft 100 through a combination of one or more of a reducer, a connector, a belt drive mechanism, and a gear drive mechanism, so as to use the motor to accurately control the speed of the rotary hook; for example, Fig. 20 As shown, the rotary hook shaft 100 is provided with a driven pulley 501, the output shaft of the motor is connected to the driving pulley, and a transmission belt 502 is tensioned between the driving pulley and the driven pulley 501 to realize belt transmission.

[0097] This lower machine head can be preferentially used as a machine head that can rotate 360 ​​degrees, so as to cooperate with the machine needle to achieve perfect stitches; at this time, this lower machine head includes a base and a second motor, and the seat body 202 is rotatably installed on the base. The second motor is used to drive the seat body 202 to rotate relative to the base, so as to adjust the orientation of the shuttle within a range of 360 degrees, thereby realizing a machine head that can rotate 360 ​​degrees. Details will not be described here one by one.

[0098] Example 6

[0099] This embodiment provides a sewing machine, including the rotary hook oil supply system described in Example 1, Example 2, Example 3 or Example 4 and a lower head commonly used in the prior art, wherein the rotary hook oil supply system is installed on the lower head to lubricate the rotary hook by active oil supply.

[0100] Example 7

[0101] This embodiment provides a sewing machine, including the lower head described in Example 5. In a more complete solution, it also includes a frame, and the lower head is fixedly mounted on the frame. The upper surface of the frame is usually flat so that the material to be sewn can be placed flat.

[0102] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rotary hook oil supply system, comprising a rotatably mounted rotary hook shaft, wherein an internal oil passage is constructed in the rotary hook shaft, characterized in that: It also includes an oil guide line and a fixedly installed oil tank, wherein the internal oil passage is inclined to the rotation center axis of the rotary hook shaft, and one end of the internal oil passage passes through the end of the rotary hook shaft to form an outlet; the oil guide line is arranged in the internal oil passage, and the distance of the internal oil passage from the rotation center axis of the rotary hook shaft gradually increases along the direction from when the lubricating oil enters the internal oil passage to when it leaves the internal oil passage; The rotary hook shaft is also configured with an oil hole, the oil hole is connected to the internal oil channel, and at least one end of the oil hole penetrates the side wall of the rotary hook shaft to form an inlet, which is used to communicate with the oil tank; The oil tank is configured with an internal oil chamber for storing lubricating oil, at least a portion of the shaft section of the rotary hook shaft is located in the internal oil chamber, and an oil hole is configured in the portion of the shaft section; The rotary hook shaft is also configured with a guide portion that matches the oil hole. The guide portion is connected to the oil hole and forms a guide gap on one side of the oil hole. The guide gap is used to accommodate lubricating oil. A blocking surface is formed on the other side of the oil hole at a position corresponding to the guide gap. The blocking surface is used to prevent the lubricating oil in the guide gap from flowing out of the guide gap. The guide part is arranged along the circumferential direction of the rotating shuttle shaft, the guide part is constructed on one side of the oil hole, the guide part is a guide groove, the guide groove includes a bottom surface connected to the inner wall surface of the oil hole, and side surfaces constructed on both sides of the bottom surface and connected to the inner wall surface of the oil hole, the blocking surface is the inner wall surface of the oil hole corresponding to the guide notch; the two ends of the oil hole respectively penetrate the side wall of the rotating shuttle shaft and form two inlets respectively, the two inlets are respectively constructed with the guide parts, and the two guide parts are distributed symmetrically with the center.

2. The hook oil supply system according to claim 1, characterized in that: One end of the oil guide line is constrained in the internal oil passage or stuck in the oil hole, and the other end extends to the outlet.

3. The hook oil supply system according to claim 1, characterized in that: The internal oil passage is a cylindrical passage; and / or, at a position where the internal oil passage is connected to the oil hole, the rotation center of the rotary hook shaft is located in the internal oil passage; And / or, the end of the oil guide wire away from the outlet is stuck at the position where the oil hole is connected to the internal oil channel by tying a knot; And / or, the oil-conducting thread is a cotton thread; And / or, the two ends of the oil hole respectively penetrate the side wall of the rotary hook shaft and form two inlets respectively; And / or, the oil hole is a cylindrical hole; And / or, the length direction of the oil hole is perpendicular to the rotation center axis of the rotary hook shaft; And / or, the inner diameter of the oil hole is larger than the inner diameter of the internal oil channel.

4. The hook oil supply system according to any one of claims 1 to 3, characterized in that: It also includes a fixedly installed restraining component, which is constructed with a center hole for passing the rotating shuttle shaft, and the side wall of the restraining component is constructed with at least one connecting hole connected to the center hole, and the connecting hole is used to connect to the oil tank; the restraining component is sleeved on the rotating shuttle shaft, and the oil hole can be connected to the connecting hole through the rotation of the rotating shuttle shaft.

5. The hook oil supply system according to claim 4, characterized in that: The restraining component is a bushing or a sleeve; And / or, there are two communicating holes, and the two communicating holes are symmetrically arranged on the restraining component; And / or, the restraining component is fixedly installed in the oil tank, and the communicating hole is communicated with the internal oil chamber in the oil tank.

6. A lower head for a sewing machine, characterized in that: A rotary hook oil supply system comprising any one of claims 1 to 5; It also includes a seat body, the oil tank is arranged on the seat body, the rotary hook shaft is rotatably arranged on the oil tank and / or the seat body, the oil tank is detachably mounted on the seat body, or the oil tank and the seat body are integrally formed components; A rotary hook, the rotary hook being mounted on an outlet end of the rotary hook shaft; and A motor is installed on the seat body and is used to drive the rotary hook shaft to rotate.

7. A sewing machine, characterized in that: It comprises the rotary hook oil supply system as described in any one of claims 1 to 5 or the lower machine head as described in claim 6.

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