A sewing machine with adjustable sewing temperature

Abstract

This invention discloses an adjustable sewing temperature sewing machine, comprising a machine base and a machine head. A needle bar assembly is mounted at one end of the machine head. The needle bar assembly includes a needle bar and a needle. A first medium temperature regulating channel is formed inside the space between the needle bar and the needle. A guide hole is formed on one side wall of the needle. A guide groove is formed at the bottom of the guide hole, and a threading hole is formed on one side of the guide groove. A presser foot rod is mounted on one side of the needle bar assembly. The presser foot rod includes a rod body and a presser bar. A second medium temperature regulating channel is formed inside the space between the rod body and the presser bar. The bottom of the presser bar has an arc-shaped presser foot or an annular presser foot. An arc-shaped presser foot has an arc-shaped recess, and an annular presser foot has an annular recess. A needle plate is mounted on the machine base. A needle hole plate is mounted on the needle plate. A protruding structure is provided at the bottom of the needle hole plate. The needle holes on the needle hole plate pass through the protruding structure. Third medium temperature regulating channels are formed at both ends of the protruding structure. An annular groove is formed on the side wall of the needle hole on the needle hole plate. The above provides a novel temperature regulation method for a sewing machine.

Description

Technical Field

[0001] This invention relates to the technical field of sewing machines, and in particular to a sewing machine with adjustable sewing temperature. Background Technology

[0002] A sewing machine is a machine that uses sewing thread to create stitches on sewing materials, allowing one or more layers of materials to be sewn together.

[0003] The main working principle of a sewing machine is as follows: the sewing material is placed on the needle plate, the feed dog on the needle plate is located at the bottom of the sewing material, and the presser foot bar is located at the top of the sewing material. The feed dog and the presser foot bar pre-press the sewing material. During the subsequent sewing process, the presser foot bar moves in a cycle to provide a forward movement trajectory for the sewing material. During the sewing process, the needle moves up and down in a cycle. During the downward sewing process, the needle passes through the presser foot bar and the needle plate in sequence, and cooperates with the shuttle inside the machine base to hook the thread, leaving the stitch at the bottom of the sewing material. Finally, the needle moves up and down, leaving intersecting sewing stitches on both sides of the sewing material.

[0004] Currently, there are two problems with sewing machine sewing:

[0005] The first problem is that during the sewing process of a sewing machine, the needle moves up and down and rubs against the sewing material at high speed, which will make the surface temperature of the needle high. If the temperature is too high, the needle may melt the sewing material, resulting in poor sewing effect.

[0006] The second problem is that during the initial process of sewing or when the ambient temperature of the sewing machine is fixed, the surface temperature of the needle is fixed. At this time, the needle fails to reach the optimal sewing temperature, so the sewing material cannot achieve the best sewing effect.

[0007] Currently, industry solutions typically employ external cooling devices (e.g., Chinese invention patent CN211620830U, entitled "A needle cooling device for a sewing machine," or Chinese invention patent CN109402890A, entitled "A needle cooling structure for a sewing machine and a sewing machine"). However, these external cooling devices have the following drawbacks:

[0008] 1. Installing an additional air blower on the side of the needle will obstruct the sewing worker's view, making it difficult for the sewing worker to observe the stitching condition when the needle moves up and down, thus making it difficult for the sewing worker to adjust the sewing situation;

[0009] 2. The air blowing device only cools the needle when it rises, and its cooling is unstable (the needle temperature fluctuates constantly) and the cooling speed is slow, which makes it difficult to improve the sewing quality.

[0010] 3. The blower is additionally installed on one side of the needle. Under normal circumstances, the blower is tilted and aimed at the needle. This causes the cooling gas blown out by the blower to generate kinetic energy on the sewing thread on the needle. This kinetic energy causes the sewing thread on the needle to be subjected to uneven force and become disordered and tangled, ultimately resulting in poor sewing quality.

[0011] 4. Currently, this needle cooling device can only introduce cooling gas to cool the needle. However, for some special sewing occasions, it is necessary to introduce a high-temperature medium. This needle cooling device cannot solve the second problem, and there is currently no other device in the industry that can solve the second problem. Summary of the Invention

[0012] The purpose of this invention is to overcome the aforementioned deficiencies in the prior art and provide a sewing machine with adjustable sewing temperature.

[0013] First: This sewing machine can not only cool the sewing thread on the needle during the sewing process, but also introduce other temperature-regulating media to regulate the temperature of the needle. It has a wide temperature regulation range and is not only used for cooling purposes.

[0014] Second: During the sewing process, there is no need to set up an additional blowing device to adjust the temperature of the sewing thread on the needle, which makes it easier for the sewing staff to observe and adjust the sewing situation;

[0015] third:

[0016] The needle bar assembly sequentially flows into the temperature-regulating medium through the first medium temperature-regulating channel, guide hole, guide groove, and thread hole, thereby regulating the temperature of the sewing thread on the needle.

[0017] Furthermore, as the needle moves downwards, the arc-shaped or annular recess of the pressure bar and the annular groove of the needle plate evenly adjust the temperature of the sewing thread on the needle.

[0018] This setting ensures stable and rapid needle temperature adjustment, and prevents the sewing thread from becoming tangled and twisted.

[0019] To achieve the above objectives, the present invention provides a sewing machine with adjustable sewing temperature, including a machine base and a sewing head mounted on the machine base. One end of the sewing head is equipped with a needle bar assembly that can be driven up and down. The needle bar assembly includes a needle bar and a needle mounted at the bottom of the needle bar. A first medium temperature regulating channel is formed inside the needle bar and the needle. A guide hole is formed on one side wall of the needle. A guide groove is formed at the bottom of the guide hole, and a threading hole is formed on one side of the guide groove. The first medium temperature regulating channel, the guide hole, the guide groove, and the threading hole are sequentially connected. A presser foot rod for the needle to pass through is mounted on one side of the needle bar assembly. The presser foot rod includes a rod body and a pressure bar mounted at the bottom of the rod body. A second medium is formed inside the rod body and the pressure bar. The temperature-regulating flow channel includes an arc-shaped or annular pressure foot at the bottom of the pressure rod. The arc-shaped pressure foot has an arc-shaped recess that communicates with the second medium temperature-regulating flow channel, and the annular pressure foot has an annular recess that communicates with the second medium temperature-regulating flow channel. A needle plate is mounted on the base, and a needle hole plate for the needle to pass through is mounted on the needle plate. A protruding structure is provided at the bottom of the needle hole plate, and the needle hole on the needle hole plate passes through the protruding structure. A third medium temperature-regulating flow channel is provided at both ends of the protruding structure. An annular groove communicating with the third medium temperature-regulating flow channel is provided on the side wall of the needle hole on the needle hole plate. The first, second, and third medium temperature-regulating flow channels are all connected to a medium supply source.

[0020] Preferably, a main shaft motor is installed at one end of the machine head, and a needle bar transmission mechanism is installed inside the machine head. The needle bar transmission mechanism is connected to the needle bar transmission mechanism. The main shaft motor drives the needle bar transmission mechanism to rotate, and the needle bar transmission mechanism drives the needle bar to reciprocate up and down.

[0021] Preferably, a height adjustment mechanism is installed on one side of the needle bar transmission mechanism, and the pressure rod is installed on the height adjustment mechanism.

[0022] Preferably, the needle bar assembly has a first medium inlet at the top of the needle bar, the first medium inlet is connected to a first medium delivery pipe, the first medium delivery pipe passes through the top of the machine head, and one end of the first medium delivery pipe is connected to a first regulating valve, which is connected to a medium supply source.

[0023] Preferably, the top of the presser foot bar is provided with a second medium inlet, which is connected to a second medium conveying pipe. The second medium conveying pipe passes through the top of the machine head, and one end of the second medium conveying pipe is connected to a second regulating valve, which is connected to a medium supply source.

[0024] Preferably, the third medium temperature regulating channels at both ends of the protruding structure of the pinhole plate are respectively connected to a third medium conveying pipe. The third medium conveying pipe passes through the base, and one end of the third medium conveying pipe is connected to a third regulating valve, which is connected to the medium supply source.

[0025] Preferably, the first medium temperature regulating channel includes a needle bar medium temperature regulating channel opened inside the needle bar and a needle medium temperature regulating channel opened inside the needle. The needle bar medium temperature regulating channel is connected to the needle medium temperature regulating channel. The needle bar medium temperature regulating channel includes a needle bar medium storage channel opened in the upper section inside the needle bar, a needle bar medium inflow channel connected to the bottom of the needle bar medium storage channel, and a needle mounting channel connected to the bottom of the needle bar medium inflow channel. The needle is inserted into the needle mounting channel. The needle medium temperature regulating channel includes a needle medium inflow channel opened in the upper middle part of the needle and connected to the needle bar medium inflow channel. The bottom of the needle medium inflow channel is connected to a guide channel. The guide channel is inclined and connected to a guide hole.

[0026] Preferably, the rod body and the pressure rod are detachably connected or integrally formed. The second medium temperature regulating channel includes a rod body medium temperature regulating channel opened inside the rod body and a pressure rod medium temperature regulating channel opened inside the pressure rod. The rod body medium temperature regulating channel and the pressure rod medium temperature regulating channel are connected. The bottom of the pressure rod has an arc-shaped pressure foot or an annular pressure foot. The arc-shaped pressure foot has an arc-shaped recess that communicates with the pressure rod medium temperature regulating channel. The annular pressure foot has an annular recess that communicates with the pressure rod medium temperature regulating channel. The arc-shaped pressure foot has an arc-shaped needle hole cavity for the needle to pass through in the middle. The arc-shaped recess is located on the arc-shaped needle hole cavity. The annular pressure foot has an annular needle hole cavity for the needle to pass through in the middle. The annular recess is located around the annular needle hole cavity. The rod body medium temperature regulating channel includes a rod body medium temperature regulating channel opened inside the pressure rod. The shaft includes a shaft medium storage channel at the upper end of the shaft, a shaft medium inflow channel connected to the bottom of the shaft medium storage channel, and a shaft medium mating channel connected to one side of the shaft medium inflow channel. The shaft medium mating channel is located on an outer side wall of the shaft. The pressure rod medium temperature regulating channel includes a pressure rod medium mating channel located on an inner side wall of the pressure rod and a pressure rod medium inflow channel connected to one side of the pressure rod medium mating channel. One end of the shaft medium mating channel is in contact with and connected to one end of the pressure rod medium mating channel. The pressure rod medium inflow channel is inclined and connected to an arc-shaped recess or an annular recess. A transition bend is formed between the pressure rod medium inflow channel and the arc-shaped recess or between the pressure rod medium inflow channel and the annular recess.

[0027] Preferably, the bottom end of the rod body is provided with a snap-fit ​​structure, and the top end of the pressure rod is provided with a snap-fit ​​groove. The snap-fit ​​structure snaps into the snap-fit ​​groove and has a threaded hole. The other end of the top of the pressure rod is provided with a stop groove. The rod body and the pressure rod are connected together by the threaded part of a bolt to the threaded hole and the head of the bolt is pressed against one end of the stop groove. The medium cooperation channel of the rod body is opened on one outer wall of the snap-fit ​​structure, and the medium cooperation channel of the pressure rod is opened on one inner wall of the snap-fit ​​groove.

[0028] Preferably, the protruding structure has a stop portion at one end and an inclined cut at the other end.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. The present invention is provided with a needle bar assembly, wherein a first medium temperature regulating channel between the needle bar and the needle can be introduced into the medium for temperature regulation, so that the temperature regulating medium flows sequentially to the first medium temperature regulating channel, the guide hole, the guide groove and the thread hole, and then flows to the sewing thread of the needle, so that the needle can be rapidly temperature regulated.

[0031] Furthermore, the present invention is provided with a presser foot bar, and a second medium temperature regulating flow channel between the bar body and the presser bar can be introduced into the medium for temperature regulation. When the needle moves downward, the arc-shaped or annular hole on the presser foot bar of the presser bar regulates the temperature around the sewing thread of the needle, and regulates the temperature of the needle a second time.

[0032] Furthermore, the present invention is provided with a perforated plate, and the third medium temperature regulating flow channel at both ends of the protruding structure can be introduced into the medium for temperature regulation. When the needle moves downward, the annular groove of the perforated plate regulates the temperature around the sewing thread of the needle, and the needle is regulated three times.

[0033] 2. A sewing machine with adjustable sewing temperature according to the present invention.

[0034] First, by having the temperature-regulating medium flow from the guide groove on one side of the needle to the sewing thread of the needle (the sewing thread passes through the thread hole), the sewing thread of the needle is cooled down. This structural design does not obstruct the sewing operator's view, making it easier for the sewing operator to observe the sewing thread condition when the needle moves up and down, thus facilitating the sewing operator to adjust the sewing situation.

[0035] Secondly, the sewing thread of the needle can be regulated by the temperature regulating medium flowing through the guide groove on the needle. When the needle moves downward, it is also regulated by the arc-shaped or annular hole on the presser foot bar and the annular groove on the needle plate, so that the sewing thread of the needle can be regulated stably and quickly.

[0036] Third, furthermore, the temperature regulating medium in the guide groove on the needle flows downwards to the thread hole, and then to the sewing thread. The temperature regulating medium in the arc-shaped or ring-shaped or ring-shaped groove regulates the temperature of the environment around the sewing thread. This temperature regulation method prevents the sewing thread from becoming disordered, rotating and tangling, thus resulting in high sewing quality.

[0037] Fourth, the first medium temperature regulating channel of the needle bar assembly, the second medium temperature regulating channel of the presser foot bar, and the third medium temperature regulating channel of the needle plate can be circulated with temperature regulating media of different temperatures, such as cold air, hot steam, liquid nitrogen, etc., to meet the sewing requirements of different temperatures during sewing, thus making it more widely applicable. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a sewing machine with adjustable sewing temperature provided in an embodiment of the present invention;

[0040] Figure 2 It is about Figure 1 A magnified view of the area pointed to by the letter A in the middle;

[0041] Figure 3 This is a schematic diagram of the needle bar assembly, presser foot bar, and pinhole plate provided in an embodiment of the present invention;

[0042] Figure 4 This is an exploded structural diagram of the needle bar assembly, presser foot bar, and pinhole plate provided in an embodiment of the present invention;

[0043] Figure 5 This is a front sectional view of the needle bar assembly, presser foot bar, and pinhole plate provided in an embodiment of the present invention;

[0044] Figure 6 This is a front sectional view of the disassembled needle bar assembly, presser foot bar, and pinhole plate provided in an embodiment of the present invention.

[0045] The diagram includes:

[0046] 1. Base; 2. Head; 21. Spindle motor; 22. Needle bar drive mechanism; 23. Height adjustment mechanism; 3. Needle bar assembly; 31. Needle bar; 32. Needle; 34. First medium inlet; 36. First medium temperature regulating channel; 361. Needle bar medium temperature regulating channel; 3611. Needle bar medium storage channel; 3612. Needle bar medium inflow channel; 3613. Needle mounting channel; 362. Needle medium temperature regulating channel; 3621. Needle medium inflow channel; 3622. Guide channel; 3623. Guide hole; 37. Guide groove; 38. Threading hole; 4. Presser foot bar; 41. Bar body; 411. Snap-fit ​​structure; 412. Threaded hole; 42. Pressing foot bar; 421. Rod; 422. Snap-fit ​​groove; 43. Annular pressure foot; 430. Annular needle hole cavity; 4300. Annular recess; 44. Second medium inlet; 45. Second medium temperature regulating channel; 451. Rod body medium temperature regulating channel; 4511. Rod body medium storage channel; 4512. Rod body medium inflow channel; 4513. Rod body medium mating channel; 452. Pressure rod medium temperature regulating channel; 4521. Pressure rod medium mating channel; 4522. Pressure rod medium inflow channel; 4523. Transition bend; 5. Pinhole plate; 51. Protruding structure; 52. Third medium temperature regulating channel; 53. Annular groove; 54. Stop part; 55. Inclined cut. Detailed Implementation

[0047] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Please see Figures 1 to 6An embodiment of the present invention provides a sewing machine with adjustable sewing temperature, including a machine base 1 and a sewing head 2 mounted on the machine base 1. One end of the sewing head 2 is equipped with a needle bar assembly 3 that can be driven up and down. The needle bar assembly 3 includes a needle bar 31 and a needle 32 mounted at the bottom of the needle bar 31. A first medium temperature regulating channel 36 is formed inside the needle bar 31 and the needle 32. A guide hole 3623 is formed on one side wall of the needle 32. A guide groove 37 is formed at the bottom of the guide hole 3623. A thread hole 38 is formed on one side of the guide groove 37. The first medium temperature regulating channel 36, the guide hole 3623, the guide groove 37, and the thread hole 38 are sequentially connected. A presser foot bar 4 for the needle 32 to pass through is mounted on one side of the needle bar assembly 3. The presser foot bar 4 includes a bar body 41 and a pressure rod 42 mounted at the bottom of the bar body 41. A second medium temperature regulating channel 46 is formed inside the bar body 41 and the pressure rod 42. The temperature channel 45 and the pressure rod 42 have an arc-shaped pressure foot or an annular pressure foot 43 at the bottom. The arc-shaped pressure foot has an arc-shaped recess that communicates with the second medium temperature regulating channel 45. The annular pressure foot 43 has an annular recess 4300 that communicates with the second medium temperature regulating channel 45. The base 1 is equipped with a needle plate (not shown in the attached figure). The needle plate is equipped with a needle hole plate 5 for the needle 32 to pass through. The bottom of the needle hole plate 5 has a protruding structure 51. The needle hole on the needle hole plate 5 passes through the protruding structure 51. The two ends of the protruding structure 51 are respectively provided with a third medium temperature regulating channel 52. The side wall of the needle hole on the needle hole plate 5 has an annular groove 53 that communicates with the third medium temperature regulating channel 52. The first medium temperature regulating channel 36, the second medium temperature regulating channel 45 and the third medium temperature regulating channel 52 are all connected to a medium supply source (not shown in the attached figure).

[0049] The medium supply source is used to provide a temperature-regulating medium, which can be a gaseous medium or a liquid medium. Gaseous media include warm water steam, high-temperature gas (some sewing materials are brittle in cold conditions and need to be heated by the needle 32 to achieve a better sewing effect), and cold air (some sewing materials cause the needle 32 to get too hot during sewing friction, which can easily melt the sewing material and requires the needle 32 to be cooled down). Liquid media include liquid nitrogen (which has a better cooling effect and is suitable for expensive or new sewing materials).

[0050] A spindle motor 21 is installed at one end of the machine head 2. A needle bar transmission mechanism 22 is installed inside the machine head 2. The needle bar transmission mechanism 22 is connected to the needle bar 31. The spindle motor 21 drives the needle bar transmission mechanism 22 to rotate, and the needle bar transmission mechanism 22 drives the needle bar 31 to move up and down reciprocally.

[0051] A height adjustment mechanism 23 is installed on one side of the needle bar drive mechanism 22, and the pressure rod 42 is mounted on the height adjustment mechanism 23. The height adjustment mechanism 23 is used to adjust the distance between the pressure rod 42 and the needle plate.

[0052] The structure and temperature control principle of the needle bar assembly 3 are as follows:

[0053] The needle bar assembly 3 has a first medium inlet 34 at the top of the needle bar 31. The first medium inlet 34 is connected to a first medium delivery pipe (not shown in the attached figure). The first medium delivery pipe passes through the top of the head 2. One end of the first medium delivery pipe is connected to a first regulating valve (not shown in the attached figure). The first regulating valve is connected to the medium supply source.

[0054] The first medium temperature regulating channel 36 includes a needle bar medium temperature regulating channel 361 formed inside the needle bar 31 and a machine needle medium temperature regulating channel 362 formed inside the machine needle 32. The needle bar medium temperature regulating channel 361 is connected to the machine needle medium temperature regulating channel 362. The needle bar medium temperature regulating channel 361 includes a needle bar medium storage channel 3611 formed in the upper part of the needle bar 31, a needle bar medium inflow channel 3612 connected to the bottom of the needle bar medium storage channel 3611, and a medium inflow channel 3612 connected to the needle bar medium. The needle inlet channel 3612 is connected to the needle mounting channel 3613 at the bottom. The needle 32 is inserted into the needle mounting channel 3613. The needle medium temperature control channel 362 includes a needle medium inlet channel 3621 located at the upper middle part of the needle 32 and connected to the needle bar medium inlet channel 3612. The bottom of the needle medium inlet channel 3621 is connected to a guide channel 3622. The guide channel 3622 is inclined and connected to a guide hole 3623.

[0055] The diameter of the aforementioned needle bar medium storage channel 3611 is larger than that of the needle bar medium inflow channel 3612. The larger diameter of the needle bar medium storage channel 3611 ensures sufficient and continuous entry of the temperature-regulating medium, thereby guaranteeing stable temperature regulation. Furthermore, a transition chamfer is provided at the connection between the needle bar medium storage channel 3611 and the needle bar medium inflow channel 3612. This serves two purposes: first, it facilitates the entry of the temperature-regulating medium into the needle bar medium inflow channel 3612; second, it prevents cracking due to stress concentration when a large amount of temperature-regulating medium enters the needle bar medium inflow channel 3612. A transition chamfer is also provided at the top of the needle 32, which facilitates the insertion of the top of the needle 32 into the needle mounting channel 3613.

[0056] In addition, a threaded mounting hole is provided on one side wall at the bottom of the needle bar 31, which is connected to the needle mounting channel 3613. A screw is screwed into the threaded mounting hole, and the screw tightens the needle 32, thereby ensuring that the needle 32 is installed firmly in the vertical direction.

[0057] The temperature regulation principle of the needle bar assembly 3 is as follows: the temperature regulation medium on the medium supply source flows sequentially to the first regulating valve, the first medium delivery pipe, the first medium inlet 34, the needle bar medium storage channel 3611, the needle bar medium inflow channel 3612, the needle medium inflow channel 3621, the guide channel 3622, the guide hole 3623, the guide groove 37 and the thread hole 38. The supply amount of the medium supply source is controlled by the opening and closing and size control of the first regulating valve. When the temperature regulation medium reaches the thread hole 38, it effectively regulates the temperature of the bottom of the needle 32 and its sewing thread.

[0058] The structure and temperature control principle of the presser foot lever 4 are as follows:

[0059] The top of the body 41 of the presser foot lever 4 is provided with a second medium inlet 44, which is connected to a second medium conveying pipe (not shown in the attached figure). The second medium conveying pipe passes through the top of the machine head 2, and one end of the second medium conveying pipe is connected to a second regulating valve (not shown in the attached figure). The second regulating valve is connected to the medium supply source.

[0060] The rod body 41 and the pressure rod 42 are detachably connected or integrally formed. The second medium temperature regulating channel 45 includes a rod body medium temperature regulating channel 451 opened inside the rod body 41 and a pressure rod medium temperature regulating channel 452 opened inside the pressure rod 42. The rod body medium temperature regulating channel 451 and the pressure rod medium temperature regulating channel 452 are connected. The bottom of the pressure rod 42 has an arc-shaped pressure foot (not shown in the figure) or an annular pressure foot 43. The arc-shaped pressure foot has an arc-shaped recess that is connected to the pressure rod medium temperature regulating channel 452. (This embodiment is not shown in the accompanying drawings). The annular pressure foot 43 has an annular recess 4300 that communicates with the pressure rod medium temperature control channel 452. The arc-shaped pressure foot has an arc-shaped needle hole cavity (this embodiment is not shown in the accompanying drawings) in the middle for the needle 32 to pass through. The arc-shaped recess is provided on the arc-shaped needle hole cavity. The annular pressure foot 43 has an annular needle hole cavity 430 in the middle for the needle 32 to pass through. The annular recess 4300 is arranged around the annular needle hole cavity 430. The rod body medium temperature control channel 451 includes a channel formed on the rod body. The rod body 41 has an upper internal medium storage channel 4511, a medium inflow channel 4512 connected to the bottom of the medium storage channel 4511, and a medium mating channel 4513 connected to one side of the medium inflow channel 4512. The medium mating channel 4513 is located on an outer side wall of the rod body 41. The pressure rod medium temperature regulating channel 452 includes a pressure rod medium mating channel 4521 located on an inner side wall of the pressure rod 42 and a pressure rod medium mating channel 4521 connected to one side of the medium mating channel 4521. The medium inflow channel 4522 and the medium-coupling channel 4513 are connected and fitted together at one end and connected at the other end of the medium-coupling channel 4521. The medium inflow channel 4522 is inclined and connected to the arc-shaped recess or the annular recess 4300. A transition bend 4523 is formed between the medium inflow channel 4522 and the arc-shaped recess or between the medium inflow channel 4522 and the annular recess 4300. This transition bend 4523 is smooth to ensure smooth flow of the temperature-regulating medium.

[0061] The bottom end of the rod body 41 is provided with a snap-fit ​​structure 411, and the top end of the pressure rod 42 is provided with a snap-fit ​​groove 421. The snap-fit ​​structure 411 snaps into the snap-fit ​​groove 421. The snap-fit ​​structure 411 is provided with a threaded hole 412. The other end of the top of the pressure rod 42 is provided with a stop groove 422. The rod body 41 and the pressure rod 42 are connected together by the threaded part of the bolt in the threaded hole 412 and the head of the bolt is pressed against one end of the stop groove 422. The medium cooperation channel 4513 of the rod body is opened on one outer wall of the snap-fit ​​structure 411, and the medium cooperation channel 4521 of the pressure rod is opened on one inner wall of the snap-fit ​​groove 421.

[0062] The diameter of the aforementioned rod medium storage channel 4511 is larger than that of the rod medium inflow channel 4512. The larger diameter of the rod medium storage channel 4511 ensures sufficient and continuous entry of the temperature-regulating medium, thereby guaranteeing stable temperature regulation. Furthermore, a chamfer is provided at the connection between the rod medium storage channel 4511 and the rod medium inflow channel 4512. This serves two purposes: first, it facilitates the entry of the temperature-regulating medium into the rod medium inflow channel 4512; second, it prevents cracking due to stress concentration when a large amount of temperature-regulating medium enters the rod medium inflow channel 4512.

[0063] The temperature regulation principle of the presser foot lever 4 is as follows: the temperature regulation medium on the medium supply source flows sequentially to the second regulating valve, the second medium conveying pipeline, the second medium inlet 44, the medium storage channel 4511 of the lever body, the medium inflow channel 4512 of the lever body, the medium matching channel 4513 of the lever body, the medium matching channel 4521 of the presser foot, the medium inflow channel 4522 of the presser foot, the transition bend 4523, the arc-shaped or annular socket 4300, and the arc-shaped or annular needle hole cavity 430. The supply amount of the medium supply source is controlled by the opening and closing and size control of the second regulating valve. When the sewing machine is sewing and the needle 32 passes through the arc-shaped or annular needle hole cavity 430, the temperature regulation medium effectively regulates the temperature of the needle 32 and its sewing thread.

[0064] The structure and temperature control principle of the pinhole plate 5 are as follows:

[0065] The third medium temperature regulating flow channels 52 at both ends of the protrusion structure 51 of the pinhole plate 5 are respectively connected to the third medium conveying pipe (not shown in the attached figure). The third medium conveying pipe passes through the base 1, and one end of the third medium conveying pipe is connected to the third regulating valve (not shown in the attached figure). The third regulating valve is connected to the medium supply source.

[0066] The protruding structure 51 has a stop portion 54 at one end and an inclined slit 55 at the other end. The stop portion 5425 is used to block the thread cutting mechanism of the prior art sewing machine, while reducing space and facilitating the movement of the prior art thread cutting mechanism. The inclined slit 5526 is used to reduce space and facilitate the installation layout of the bobbin in the prior art sewing machine.

[0067] The temperature regulation principle of the perforated plate 5 is as follows: the temperature regulation medium from the medium supply source flows sequentially to the third regulating valve, the third medium delivery pipe, the third medium temperature regulation flow channels 52 at both ends of the protruding structure 51 of the perforated plate 5, the annular groove 53, and the perforation wall on the perforated plate 5. The supply amount of the medium supply source is controlled by the opening and closing of the third regulating valve. When the sewing machine is sewing and the needle 32 passes through the perforation wall of the perforated plate 5, the temperature regulation medium effectively regulates the temperature of the needle 32 and the sewing thread.

[0068] The needle bar assembly 3 described above, wherein the needle bar 31 can be machined or injection molded. The needle 32 can be machined (achieved by drilling oblique holes in the guide channel 3622) or injection molded.

[0069] If the bar body 41 and the pressure bar 42 are detachably connected, the bar body 41 and the pressure bar 42 are respectively manufactured by machining or die casting and then splicing. If the bar body 41 and the pressure bar 42 are integrally formed, the bar body 41 and the pressure bar 42 are first assembled and then welded and bonded together.

[0070] The aforementioned pinhole plate 5 can be injection molded or machined. When machining, first open the third medium temperature regulating channel 52 at both ends, and then use an internal milling cutter to machine the annular groove 53.

[0071] The advantages of the adjustable sewing temperature sewing machine of the present invention are as follows:

[0072] First, by having the temperature-regulating medium flowing from the guide groove 37 on one side of the needle 32 to the sewing thread of the needle 32 (the sewing thread passes through the thread hole 38), the bottom of the needle 32 and its sewing thread are cooled. This structural design does not obstruct the sewing operator's view, thus making it easier for the sewing operator to observe the sewing thread condition when the needle 32 moves up and down, which in turn helps the sewing operator to adjust the sewing situation.

[0073] Secondly, the needle 32 and its sewing thread can be regulated by the temperature regulating medium flowing through the guide groove 37 on the needle 32. When the needle 32 moves downward, it is also regulated by the arc-shaped or annular hole 4300 on the presser foot bar 4 and the annular groove 53 on the needle plate 5, so that the sewing thread of the needle 32 is regulated stably and the temperature regulation speed is fast.

[0074] Third, furthermore, the temperature regulating medium in the guide groove 37 on the needle 32 flows downward to the thread hole 38, and then to the sewing thread. The temperature regulating medium in the arc-shaped or annular hole 4300 and the annular groove 53 regulates the temperature of the environment around the sewing thread. This temperature regulation method will not cause the sewing thread to rotate and entangle in a disordered manner, thus resulting in higher sewing quality.

[0075] Fourth, the first medium temperature regulating channel 36 of the needle bar assembly 3, the second medium temperature regulating channel 45 of the presser foot bar 4, and the third medium temperature regulating channel 52 of the needle plate 5 can be circulated with temperature regulating media of different temperatures, such as cold air, hot steam, liquid nitrogen, etc., to meet the sewing requirements of different temperatures during sewing, thus having a wider range of applications.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sewing machine with adjustable sewing temperature, comprising a machine base (1) and a sewing head (2) mounted on the machine base (1), characterized in that, The head (2) is equipped with a needle bar assembly (3) that can be driven up and down at one end. The needle bar assembly (3) includes a needle bar (31) and a needle (32) installed at the bottom of the needle bar (31). A first medium temperature regulating channel (36) is opened inside between the needle bar (31) and the needle (32). A guide hole (3623) is opened on one side wall of the needle (32). A guide groove (37) is provided at the bottom of the guide hole (3623). The guide groove (37) is located on one side. A threading hole (38) is provided. The first medium temperature regulating channel (36), guide hole (3623), guide groove (37) and threading hole (38) are connected in sequence. A presser foot bar (4) for the needle (32) to pass through is provided on one side of the needle bar assembly (3). The presser foot bar (4) includes a bar body (41) and a pressure rod (42) installed at the bottom of the bar body (41). A second medium temperature regulating channel (45) is provided inside the space between the bar body (41) and the pressure rod (42). The pressure rod (42) has an arc-shaped pressure foot or an annular pressure foot (43) at its bottom. The arc-shaped pressure foot has an arc-shaped recess that communicates with the second medium temperature regulating channel (45). The annular pressure foot (43) has an annular recess (4300) that communicates with the second medium temperature regulating channel (45). The base (1) is equipped with a needle plate. The needle plate is equipped with a needle hole plate (5) for the needle (32) to pass through. The bottom of the needle hole plate (5) has a protrusion. The plate (5) has a raised structure (51), and the pinholes on the pinhole plate (5) pass through the raised structure (51). The raised structure (51) has a third medium temperature regulating channel (52) at both ends. The sidewall of the pinhole on the pinhole plate (5) has an annular groove (53) that communicates with the third medium temperature regulating channel (52). The first medium temperature regulating channel (36), the second medium temperature regulating channel (45) and the third medium temperature regulating channel (52) are all connected to a medium supply source. The needle bar assembly (3) has a first medium inlet (34) at the top of the needle bar (31). The first medium inlet (34) is connected to a first medium conveying pipe. The first medium conveying pipe passes through the top of the machine head (2). One end of the first medium conveying pipe is connected to a first regulating valve, which is connected to the medium supply source. The top of the bar body (41) of the presser foot (4) is provided with a second medium inlet (44), the second medium inlet (44) is connected to a second medium conveying pipe, the second medium conveying pipe passes through the top of the machine head (2), one end of the second medium conveying pipe is connected to a second regulating valve, and the second regulating valve is connected to the medium supply source; The first medium temperature regulating channel (36) includes a needle bar medium temperature regulating channel (361) opened inside the needle bar (31) and a machine needle medium temperature regulating channel (362) opened inside the machine needle (32). The needle bar medium temperature regulating channel (361) is connected to the machine needle medium temperature regulating channel (362). The needle bar medium temperature regulating channel (361) includes a needle bar medium storage channel (3611) opened in the upper part of the needle bar (31), a needle bar medium inflow channel (3612) connected to the bottom of the needle bar medium storage channel (3611), and a needle bar medium inflow channel (3612) connected to the needle bar medium inflow channel. The bottom of the channel (3612) is connected to the needle mounting channel (3613), the needle (32) is inserted into the needle mounting channel (3613), the needle medium temperature regulating channel (362) includes a needle medium inflow channel (3621) opened at the upper middle part of the needle (32) and connected to the needle bar medium inflow channel (3612), the bottom of the needle medium inflow channel (3621) is connected to the guide channel (3622), the guide channel (3622) is inclined, and the guide channel (3622) is connected to the guide hole (3623); The rod body (41) and the pressure rod (42) are detachably connected. The second medium temperature regulating channel (45) includes a rod body medium temperature regulating channel (451) opened inside the rod body (41) and a pressure rod medium temperature regulating channel (452) opened inside the pressure rod (42). The rod body medium temperature regulating channel (451) and the pressure rod medium temperature regulating channel (452) are connected. The bottom of the pressure rod (42) has an arc-shaped pressure foot or an annular pressure foot (43). The arc-shaped pressure foot has an arc-shaped recess that communicates with the pressure rod medium temperature regulating channel (452). The presser foot (43) has an annular recess (4300) that communicates with the medium temperature regulation channel (452) of the presser rod. The arc-shaped presser foot has an arc-shaped needle hole cavity for the needle (32) to pass through in the middle. The arc-shaped recess is located on the arc-shaped needle hole cavity. The annular presser foot (43) has an annular needle hole cavity (430) for the needle (32) to pass through in the middle. The annular recess (4300) is arranged around the annular needle hole cavity (430). The medium temperature regulation channel (451) of the rod body includes a rod body medium storage channel (450) located at the upper end of the inside of the rod body (41). 511), a rod medium inflow channel (4512) connected to the bottom of the rod medium storage channel (4511) and a rod medium mating channel (4513) connected to one side of the rod medium inflow channel (4512), wherein the rod medium mating channel (4513) is opened on an outer side wall of the rod (41), and the pressure rod medium temperature regulating channel (452) includes a pressure rod medium mating channel (4521) opened on an inner side wall of the pressure rod (42) and a pressure rod medium inflow channel (4522) connected to one side of the pressure rod medium mating channel (4521). One end of the rod body medium matching channel (4513) is fitted and connected to one end of the pressure rod medium matching channel (4521). The pressure rod medium inflow channel (4522) is inclined. The pressure rod medium inflow channel (4522) is connected to the arc-shaped socket, or the pressure rod medium inflow channel (4522) is connected to the annular socket (4300). A transition bend (4523) is formed between the pressure rod medium inflow channel (4522) and the arc-shaped socket or between the pressure rod medium inflow channel (4522) and the annular socket (4300). The bottom end of the rod body (41) is provided with a snap-fit ​​structure (411), and the top end of the pressure rod (42) is provided with a snap-fit ​​groove (421). The snap-fit ​​structure (411) snaps into the snap-fit ​​groove (421). The snap-fit ​​structure (411) is provided with a threaded hole (412). The other end of the top of the pressure rod (42) is provided with a stop groove (422). The rod body (41) and the pressure rod (42) are connected together by the threaded part of the bolt in the threaded hole (412) and the head of the bolt is pressed against one end of the stop groove (422). The medium cooperation channel (4513) of the rod body is opened on one outer wall of the snap-fit ​​structure (411), and the medium cooperation channel (4521) of the pressure rod is opened on one inner wall of the snap-fit ​​groove (421).

2. The sewing machine with adjustable sewing temperature according to claim 1, characterized in that, The head (2) is equipped with a spindle motor (21) at one end and a needle bar transmission mechanism (22) is installed inside the head (2). The needle bar transmission mechanism (22) is connected to the needle bar (31) for transmission. The spindle motor (21) drives the needle bar transmission mechanism (22) to rotate and the needle bar transmission mechanism (22) drives the needle bar (31) to move up and down reciprocally.

3. A sewing machine with adjustable sewing temperature according to claim 2, characterized in that, The needle bar transmission mechanism (22) is equipped with a height adjustment mechanism (23) on one side, and the pressure rod (42) is mounted on the height adjustment mechanism (23).

4. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that, The third medium temperature regulating channel (52) at both ends of the protrusion structure (51) of the pinhole plate (5) is connected to a third medium conveying pipe. The third medium conveying pipe passes through the base (1). One end of the third medium conveying pipe is connected to a third regulating valve, which is connected to the medium supply source.

5. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that, The protruding structure (51) has a stop part (54) at one end and an inclined cut (55) at the other end.

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