A floating rotary hook and a sewing machine

Abstract

The present application provides a floating rotary hook and a sewing machine, specifically relating to the technical field of sewing machines. It has a thread stand and a latch needle. It is characterized in that the thread stand is placed in the inner cavity of the floating rotary hook. The rear part of the floating rotary hook is adjacent to a fixed rod. The rear part of the floating rotary hook has a positioning cavity matching the fixed rod. The front part of the floating rotary hook has a abutting device that forms a thread sliding gap by matching the fixed rod with the positioning cavity. The latch needle is connected to the hollow main shaft of the power source provided in the present application. Through the setting of the abutting device at the front part of the floating rotary hook and the fixed rod at the rear part of the floating rotary hook, the sewing thread smoothly slides the upper thread past both sides of the floating rotary hook during the operation of the latch needle, realizing the formation of a lockstitch between the upper thread and the lower thread. A floating rotary hook and a sewing machine of the present application have the advantage of not requiring the addition of lubricant, effectively solving the problem of pollution caused by lubricant to the sewing thread and fabric, and having a high application prospect.

Description

Technical Field

[0001] The present application proposes a suspended rotary shuttle and a sewing machine. The suspended rotary shuttle of the present invention is applied to various sewing machines using rotary shuttles, such as household sewing machines, industrial lockstitch machines, heavy-duty sewing machines, embroidery machines, roller machines, etc., and specifically relates to the technical field of sewing machines. Background Art

[0002] As a sewing machine for sewing fabrics, the sewing machine has a history of more than 200 years. It has made great contributions to the development of the clothing industry in human society and promoted the development of human civilization. Throughout the history of the development of sewing machine technology, its rotary shuttle still follows the original plan, and the technical principles implemented remain the same. As a key component of sewing equipment, the rotary shuttle has high requirements in production and manufacturing, and the production cost is also high. The rotary shuttle is very easy to be damaged during use, and the failure rate is also high, resulting in a relatively short service life. When sewing, the rotary shuttle runs at high speed, and lubricants need to be added to the rotary shuttle body and the high-speed rotary shuttle shaft. In addition, the high-speed rotary shuttle is supported by the mechanical transmission system of the sewing machine, and needs to match the shaft and the speed change gear set, which increases the cost of the sewing machine. The need to add lubricants to the rotary shuttle and its rotary shuttle shaft can easily cause contamination of the sewing thread and fabric; the high-speed operation of the rotary shuttle during sewing restricts the development of intelligent automation, oil-free, and lightweight sewing machines. Summary of the invention

[0003] In view of the above technical deficiencies of the rotary hook of the existing sewing machine, the present application breaks the conventional sewing machine design concept, launches and produces a suspended rotary hook without contact friction and no need to add lubricant, which is easy to use and has a long service life. The suspended rotary hook and sewing machine have a thread rack and a hook needle, which are characterized in that the thread rack is placed in the inner cavity of the suspended rotary hook, the rear of the suspended rotary hook is adjacent to the fixed rod, the rear of the suspended rotary hook has a positioning cavity matching the fixed rod, the front of the suspended rotary hook has an abutment device that matches the fixed rod with the positioning cavity to form a sliding line gap, and the hook needle is connected to the hollow main shaft of the power source of the present application. Through the above-mentioned abutment device at the front of the suspended rotary hook and the fixed rod at the rear of the suspended rotary hook, the sewing thread can smoothly slide the upper thread from both sides of the suspended rotary hook when the hook needle is running, so that the upper thread and the lower thread form a knot.

[0004] Furthermore, the positioning cavity matches the positioning head of the fixed rod, and the positioning groove of the positioning cavity matches the positioning protrusion of the fixed rod. The abutment device is fixed on the sewing machine head / or the power source / or the fixed rod, and the abutment device abuts on the suspended rotary hook / or the thread rack adjacent to the abutment device. The abutment device can be flexibly fixed. When in use, the abutment device can be twisted or pulled to abut on the suspended rotary hook / or the thread rack, thereby preventing the thread rack or the suspended rotary hook from sliding out.

[0005] Further, the abutting device is provided as an anti-slip-out baffle for abutting against a floating shuttle or a wire holder or a fixed rod, and the anti-slip-out baffle has bumps that abut against the wire holder shaft of the floating shuttle. Refining the above-mentioned abutting device into an anti-slip-out baffle makes the abutting of the anti-slip-out baffle against the wire holder shaft more effective and the wire sliding effect more obvious.

[0006] Further, the wire sliding plane of the floating shuttle is higher than the wire holder placed in the inner cavity of the floating shuttle, and the wire sliding plane on the front side of the wire dividing boss is adjacent to the anti-slip-out baffle to form a wire sliding gap; the rear side of the wire dividing boss has a wire sliding inclined plane, and the positioning head and the positioning cavity, and the positioning convex block of the positioning head and the positioning groove of the positioning cavity are adjacent to form a wire sliding gap. The setting of the wire dividing boss can enable the upper thread for sewing to smoothly slide from the wire dividing boss to the wire sliding plane and the wire sliding inclined plane respectively under the traction of the hook needle, making the wire sliding smooth and fast.

[0007] Further, the floating shuttle is further provided with a front convex block, and the front convex block is provided with a needle hole and a lower thread leading-out groove.

[0008] Further, the fixed rod and the hollow main shaft of the power source are concentrically arranged, the fixed rod is arranged inside the hollow main shaft, the fixed rod and the wire holder shaft are coaxially arranged, the fixed rod and the hook needle driven by the power source to rotate in a circle are coaxially arranged, the power source drives the hook needle to rotate on one side of the thread-hooking position of the sewing needle, and the power source is sleeved on the fixed rod so that the hook needle can cooperate with the power source and the sewing needle to rotate to achieve sewing.

[0009] Further, a bearing is arranged between the fixed rod and the hollow main shaft of the power source. It is hereby specially stated that the setting of the bearing is not limited to only using the dynamic connection of the bearing.

[0010] This application also proposes a sewing machine, which includes the above-mentioned floating shuttle, and the above-mentioned floating shuttle is installed on the sewing machine and used for sewing.

[0011] The wire frame of the present application is disposed in the inner cavity of the floating shuttle. By providing a abutting device at the front of the floating shuttle and a fixing rod at the rear of the floating shuttle, a positioning and wire-sliding gap for the wire frame and the floating shuttle is formed. Driven by a power source, the hook needle hooks the upper thread of the sewing needle. The upper thread slides over the wire-sliding inclined surfaces and wire-sliding flat surfaces on both sides of the wire-dividing boss of the floating shuttle, and smoothly drives the wire frame to pull out the lower thread to form a lockstitch. During this process, the wire frame and the floating shuttle have no contact and no friction, realizing the natural wire-out of the wire frame of the present application and the static operation of the floating shuttle, making the sewing machine using the floating shuttle of the present application have better mechanical transmission efficiency, effectively replacing the complex mechanical transmission mechanism of the original sewing machine, and having high promotion value. In addition, a floating shuttle and a sewing machine of the present application have the advantage of not requiring lubricant addition, effectively solving the problem of pollution caused by lubricant to the sewing thread and fabric. The solution of the present application subverts the design concept of traditional sewing equipment and has high application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of a floating shuttle and a sewing machine of the present application;

[0013] Figure 2 is an exploded view of a floating shuttle and a sewing machine of the present application;

[0014] Figure 3 is a structural diagram of the floating shuttle of a floating shuttle and a sewing machine of the present application;

[0015] Figure 4 is an anti-slip-out baffle diagram of a floating shuttle and a sewing machine of the present application;

[0016] Figure 5 is an initial state diagram of thread hooking of a floating shuttle and a sewing machine of the present application;

[0017] Figure 6 is a thread-hooking and thread-off state diagram of a floating shuttle and a sewing machine of the present application;

[0018] Figure 7 is a state diagram of forming a lockstitch of a floating shuttle and a sewing machine of the present application.

[0019] Reference numerals: sewing machine head 1, sewing needle 2, thread-hooking position 21, abutting device 3, anti-slip-out baffle 31, bump 32, hook needle 5, wire frame 6, floating shuttle 7, positioning groove 71, wire-dividing boss 72, wire-sliding inclined surface 73, wire-sliding flat surface 74, front projection 75, lower thread leading-out groove 76, positioning cavity 77, needle hole 78, inner cavity 79, wire frame shaft 7a, power source 91, hollow main shaft 911, fixing rod 92, positioning head 921, positioning projection 922, bearing 93, upper thread 1a, lower thread 1d, thread-off position 1c. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making the protection scope of the present application more clearly defined. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0021] Figure 1 Figure 2 Figure 3 Figure 4 It is an attached drawing of a floating rotary hook and a sewing machine of the present application. The floating rotary hook has a power source 91, a abutting device 3, a floating rotary hook 7, a sewing needle 2, a fixed rod 92, a thread stand 6 and a hook needle 5. The abutting device 3 of the present application is indirectly / or directly fixed on the sewing machine head 1 / or the power source 911 / or the fixed rod 92, and the abutting device 3 is used to abut against the thread stand 6 / or the floating rotary hook 7. When the abutting device 3 is in use, it can be twisted or turned to rotate the abutting device 3 onto the thread stand 6 / or the floating rotary hook 7 to implement abutting. When the thread stand 6 needs to be taken out, after twisting or turning the abutting device 3, the floating rotary hook 7 and the thread stand 6 can be taken away together.

[0022] There is a positioning setting and a thread sliding gap between the floating rotary hook 7 and the fixed rod 92. The rear part of the floating rotary hook 7 is adjacent to the fixed rod 92. The above-mentioned floating rotary hook 7 has a positioning cavity 77, and the positioning cavity 77 is provided with a positioning groove 71. The positioning groove 71 is arranged on the side of the floating rotary hook 7 away from the fixed rod 92. The front end of the fixed rod 92 has a positioning head 921, and the positioning head 921 has a positioning convex block 922. The positioning convex block 922 is arranged on the side of the fixed rod 92 away from the floating rotary hook 7. The positioning cavity 77 of the floating rotary hook 7 is positioned on the positioning head 921 of the fixed rod 92. The front part of the floating rotary hook 7 has an abutting device 3 that matches the fixed rod 92 and the positioning cavity 77 to form a thread sliding gap, so that the floating rotary hook 7 and the fixed rod 92 form a positioning and a thread sliding gap under the abutment of the abutting device 3. During the sewing process, the floating rotary hook 7, the abutting device 3 and its fixed rod 92 are stationary. The sewing needle 2 has a thread hooking part 21, the hook needle 5 is connected to the power source 91, and the thread hooking part 21 is used for the hook needle 5 to hook the thread when the power source 91 implements thread hooking. The fixed rod 92 and the hook needle 5 driven by the power source 91 to rotate in a circle are coaxially arranged.

[0023] There is a positioning arrangement and a sliding line gap between the suspended rotary hook 7 and the abutment device 3. The abutment device 3 is arranged at the front of the suspended rotary hook 7. The abutment device 3 is a general abutment scheme. The abutment scheme of this embodiment proposes an anti-slip baffle 31. The setting of the anti-slip baffle 31 does not mean that the abutment scheme of this application is limited to the anti-slip baffle 31 itself. This embodiment is provided with an anti-slip baffle 31 that is indirectly or directly fixed on the sewing machine head 1 / or the power source 91 / or the fixed rod 92. The same anti-slip baffle 31 is arranged at the front of the suspended rotary hook 7. The above-mentioned anti-slip baffle 31 abuts against the suspended rotary hook 7 and / or the thread rack 6 in the form of a cover plate, and plays a role in lateral positioning of both the above-mentioned suspended rotary hook 7 and the thread rack 6. The anti-slip baffle 31 can be twisted or pulled to achieve abutment or departure from the suspended rotary hook 7 and / or the thread rack 6.

[0024] The above-mentioned suspension hook 7 has an inner cavity 79 that can accommodate the thread rack 6 and a thread rack shaft 7a. The thread rack 6 is placed on the thread rack shaft 7a in the inner cavity 79 of the suspension hook 7, and the thread rack shaft 7a passes through the thread rack 6. The above-mentioned anti-slip baffle 31 also has a convex point 32, and the above-mentioned convex point 32 abuts on the thread rack shaft 7a of the suspension hook 7. The above-mentioned fixed rod 92 is coaxially arranged with the thread rack 6, and the fixed rod 92 is coaxially arranged with the thread rack shaft 7a. As another solution, the convex point 32 can also be set to be concave, and the technical effect achieved is the same.

[0025] The power source 91 has a hollow main shaft 911, which is the output shaft of the power source 91. The hollow main shaft 911 of the power source 91 is concentrically arranged with the fixed rod 92. A dynamic connection can be arranged between the two, or the fixed rod 92 can be arranged only inside the hollow main shaft 911, and the power source 91 operates as usual. The fixed rod 92 passes through the hollow main shaft 911. In order to facilitate assembly and improve operation accuracy, a bearing 93 is arranged between the hollow main shaft 911 and the fixed rod 92. The power source 91 is dynamically connected to the fixed rod 92. The power source 91 is fixed on the sewing machine head 1, and the hook needle 5 is connected to the hollow main shaft 911 of the power source 91. The hook needle 5 is directly connected to the power source 91, or, as another embodiment, a connector is arranged between the hook needle 5 and the power source 91, so that the power source 91 drives the hook needle 5 to operate.

[0026] The floating rotating shuttle 7 also has a thread separating boss 72, a front bump 75, a thread sliding inclined surface 73 and a thread sliding flat surface 74. The thread sliding inclined surface 73 and the thread sliding flat surface 74 are located on both sides of the thread separating boss 72. The thread sliding inclined surface 73 of the above-mentioned floating rotating shuttle 7 faces the power source 91 side, and the thread sliding flat surface 74 faces the anti-slip-out baffle 31 side. The thread sliding flat surface 74 of the floating rotating shuttle 7 is higher than the thread holder 6 placed in the inner cavity 79 of the floating rotating shuttle 7. The function of the thread separating boss 72 is to separate the threads. The sewing thread slides over the thread sliding inclined surface 73 first and then over the thread sliding flat surface 74 under the drive of the hook needle 5. The hook needle 5 rotates around the outer circumference of the thread separating boss 72 of the floating rotating shuttle 7 along with the power source 91, and continuously slides the upper thread 1a over the thread separating boss 72( Figure 5 Figure 6 and Figure 7 showing the upper thread 1a). Since there is a thread sliding gap between the above-mentioned floating rotating shuttle 7 and the abutting device 3, it is beneficial for the sewing thread to bypass the thread separating boss 72. The front bump 75 is arranged at the front end of the thread separating boss 72, and the front bump 75 has a needle hole 78 and a lower thread leading-out groove 76.

[0027] When the floating rotating shuttle 7 is placed on the fixed rod 92, the positioning cavity 77 of the floating rotating shuttle 7 is positioned on the positioning head 921 of the fixed rod 92, the positioning groove 71 is positioned on the positioning bump 922, and the convex point 32 of the anti-slip-out baffle 31 abuts against the thread holder shaft 7a. In this way, it not only determines the positioning setting of the floating rotating shuttle 7 together with the thread holder 6 between the fixed rod 92 and the convex point 32, but also ensures the formation of the thread sliding gap between the floating rotating shuttle 7 and the anti-slip-out baffle 31 and between the floating rotating shuttle 7 and the fixed rod 92.

[0028] The above-mentioned hook needle 5 rotates continuously along with the power source 91 on the outer circumference of the thread separating boss 72 of the floating rotating shuttle 7. The hook needle 5 is on the tangent plane at the thread hooking position 21, and the sewing needle 2 is parallel to the side surface of the thread holder 6.

[0029] The above-mentioned hook needle 5 and the floating rotating shuttle 7 work in a non-contact thread hooking and thread separating cooperation. When placing the thread holder 6, pull out the lower thread 1d and lead it into the lower thread leading-out groove 76 of the floating rotating shuttle 7, abut the floating rotating shuttle 7 together with the thread holder 6 against the fixed rod 92, and then cover the anti-slip-out baffle 31, and the sewing work can start; when it is necessary to take out the thread holder 6, open the anti-slip-out baffle 31, and the floating rotating shuttle 7 together with the thread holder 6 can be taken out. The floating rotating shuttle 7 of the present application is completely different from the rotating shuttle of the prior art in the operation mode. The floating rotating shuttle 7 is static during sewing, and the power source 91 drives the hook needle 5 to perform the sewing thread hooking action without contact and wear.

[0030] Combined with the attached Figure 5 Figure 6 and Figure 7, the crochet hook 5 of the present application is arranged on one side of the thread - hooking position 21 of the sewing needle 2, and the needle hole 78 of the front lug 75 allows the tip of the front end of the sewing needle 2 to move. Driven by the power source 91, the crochet hook 5 hooks the upper thread 1a on the thread - hooking position 21 of the sewing needle 2. Driven by the power source 91, the crochet hook 5 with the upper thread 1a rotates towards the thread - separating boss 72, so that the upper thread 1a slides past the sliding thread inclined surface 73 first and then past the sliding thread flat surface 74. When the crochet hook 5 rotates to the thread - releasing position 1c with the crochet hook head facing upwards, the upper thread 1a is naturally pulled up by the sewing needle 2, and the first knot is formed by the upper thread 1a and the lower thread 1d. When the power source 91 continues to operate and the crochet hook 5 continues to generate the above - mentioned thread - hooking movement track, the pulling force of the crochet hook 5 on the upper thread 1a drives the output of the lower thread 1d in the wire frame 6 inside the floating shuttle 7. The crochet hook 5 and the sewing needle 2 coordinate with each other to achieve sewing thread output at a relatively low rotational speed required by the wire frame 6 during the sewing process. At the same time, when the wire frame 6 outputs the thread, the floating shuttle 7 of the present application is in a static state, overcoming the technical defects that the existing sewing machine shuttle has high requirements for rotational speed and needs to add lubricant.

[0031] The present application also proposes a sewing machine, which includes the above - mentioned floating shuttle 7 and its related components, and the above - mentioned floating shuttle 7 is installed on the sewing machine and used for sewing.

[0032] The above - mentioned is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A floating rotating shuttle, having a thread holder (6) and a latch needle (5), characterized in that, It also has a floating rotary hook (7), a fixed rod (92) and a power source (91). The thread stand (6) is placed in the inner cavity (79) of the floating rotary hook (7). The rear part of the floating rotary hook (7) is adjacent to the fixed rod (92). The rear part of the floating rotary hook (7) has a positioning cavity (77) that matches the fixed rod (92). The front part of the floating rotary hook (7) has a abutting device (3) that forms a thread-sliding gap by matching the fixed rod (92) with the positioning cavity (77). The abutting device (3) abuts against the floating rotary hook (7) or the thread stand (6) adjacent to the abutting device (3). The hook needle (5) is connected to the hollow main shaft (911) of the power source (91). The fixed rod (92) and the hollow main shaft (911) are concentrically arranged. The fixed rod (92) is inserted inside the hollow main shaft (911). The fixed rod (92) has a positioning head (921) and a positioning bump (922). The positioning head (921) matches the positioning cavity (77). The positioning cavity (77) has a positioning groove (71). The positioning groove (71) matches the positioning bump (922). The abutting device (3) is set as an anti-slip-out baffle (31). The anti-slip-out baffle (31) is used to abut against the floating rotary hook (7) or the thread stand (6). The anti-slip-out baffle (31) has bumps (32). The floating rotary hook (7) also has a thread stand shaft (7a), a thread-dividing boss (72) and a thread-sliding plane (74). The bumps (32) abut against the thread stand shaft (7a). The thread-sliding plane (74) is higher than the thread stand (6) placed in the inner cavity (79) of the floating rotary hook (7). A thread-sliding gap is formed between the thread-sliding plane (74) in front of the thread-dividing boss (72) and the anti-slip-out baffle (31). The rear side of the thread-dividing boss (72) has a thread-sliding inclined surface (73). The thread-sliding inclined surface (73) and the thread-sliding plane (74) are located on both sides of the thread-dividing boss (72). A thread-sliding gap is formed between the positioning head (921) and the positioning cavity (77), and between the positioning bump (922) and the positioning groove (71). The sewing needle (2) has a thread-hooking part (21). The power source (91) drives the hook needle (5) to rotate and is on one side of the thread-hooking part (21). During sewing, the floating rotary hook (7) is stationary.

2. The suspension rotary shuttle according to claim 1, wherein The floating rotary hook (7) is also provided with a front bump (75). The front bump (75) is provided with a needle hole (78) and a lower-thread leading-out groove (76).

3. A floating rotary shuttle according to claim 1, characterized in that, The thread stand shaft (7a) is coaxially arranged with the fixed rod (92). The fixed rod (92) is coaxially arranged with the hook needle (5) driven by the power source (91) to rotate in a circle.

4. A floating rotary shuttle according to claim 1, characterized in that, A bearing (93) is arranged between the fixed rod (92) and the hollow main shaft (911).

5. A sewing machine, comprising the suspension rotating hook (7) according to any one of the above claims 1 to 4, characterized in that, The described floating rotary hook (7) is installed on a sewing machine and is used for sewing.

Images