Sewing machine capable of adjusting sewing temperature

Abstract

The sewing machine capable of adjusting the sewing temperature comprises a machine base and a machine head, a needle rod assembly is arranged at one end of the machine head, the needle rod assembly comprises a needle rod and a machine needle, a first medium temperature adjusting flow channel is formed in the position between the needle rod and the machine needle, a guide hole is formed in one side wall of the machine needle, a guide groove is formed in the bottom of the guide hole, and a threading hole is formed in one side of the guide groove; a presser foot rod is arranged on one side of the needle rod assembly and comprises a rod body and a pressing rod, a second medium temperature adjusting flow channel is formed in the position between the rod body and the pressing rod, an arc-shaped presser foot or an annular presser foot is arranged at the bottom of the pressing rod, an arc-shaped nest hole is formed in the arc-shaped presser foot, an annular nest hole is formed in the annular presser foot, and a needle plate is arranged on the machine base. A needle hole plate is arranged on the needle plate, a protruding structure is arranged at the bottom of the needle hole plate in a protruding mode, a needle hole in the needle hole plate penetrates through the protruding structure, third medium temperature adjusting flow channels are formed in the two ends of the protruding structure respectively, and an annular groove is formed in the side wall of the needle hole in the needle hole plate; the invention provides a novel temperature adjusting mode of the sewing machine.

Description

Technical Field

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

[0002] A sewing machine is a machine that uses sewing thread to form sewing seams on sewing materials, so that one or more layers of sewing materials are sewn together.

[0003] The main working principle of the sewing machine is: 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, the presser foot rod is located at the top of the sewing material, the sewing material is pre-tightened between the feed dog and the presser foot rod, and in the subsequent sewing process, the presser foot rod circulates to provide a forward motion 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 rod and the needle hole plate in turn, and cooperates with the shuttle inside the machine base to hook the thread, leaving the stitches at the bottom of the sewing material. Finally, the needle moves up and down, leaving cross sewing stitches on both sides of the sewing material.

[0004] At present, there are two problems when sewing with a sewing machine:

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

[0006] The second problem is that in the initial process of the sewing machine or when the ambient temperature of the sewing machine is fixed, since the surface temperature of the needle is fixed, the needle fails to reach the optimal sewing temperature, and thus the sewing material cannot achieve the best sewing effect;

[0007] At present, the industry's solution usually uses an external blowing device for cooling (for example, patent number: CN211620830U, patent name: A Chinese invention patent for a needle cooling device in a sewing machine, or patent number: CN109402890A, patent name: A Chinese invention patent application for a sewing machine needle cooling structure and a sewing machine), but this type of external blowing device has the following defects:

[0008] 1. An additional blowing device is installed on one side of the needle, which will block the view of the sewing personnel, making it difficult for the sewing personnel to observe the sewing situation when the needle moves up and down, and thus making it difficult for the sewing personnel to adjust the sewing situation;

[0009] 2. The blowing device will cool the needle only when the needle is rising. The cooling is unstable (the needle temperature keeps fluctuating) and the cooling speed is not fast, which makes it difficult to improve the sewing quality.

[0010] 3. The blowing device is additionally installed on one side of the needle. Generally, the blowing device is tilted toward the needle to blow air, which causes the cooling gas blown out by the blowing device to generate kinetic energy that tilts to one side on the sewing thread on the needle. This kinetic energy causes the sewing thread on the needle to be unevenly stressed and tangled in disorder, ultimately resulting in poor sewing quality.

[0011] 4. At present, the needle cooling device can only pass cooling gas to cool the needle. However, in some special sewing occasions, high-temperature medium needs to be passed. The 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 the present invention is to overcome the above-mentioned defects in the prior art and provide a sewing machine with adjustable sewing temperature.

[0013] First: This sewing machine can not only cool down the sewing thread on the needle during sewing, but also pass other temperature regulating media to adjust the temperature of the needle. The temperature regulating range is large and it 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 is convenient for the sewing staff to observe and adjust the sewing situation;

[0015] third:

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

[0017] Moreover, when the needle moves downward, the arc-shaped or annular holes of the pressure rod and the annular groove of the needle hole plate evenly adjust the temperature of the sewing thread on the needle.

[0018] This arrangement ensures that the needle temperature is adjusted stably and quickly, and does not cause the sewing threads to rotate disorderly and become entangled.

[0019] To achieve the above-mentioned purpose, the present invention provides a sewing machine with adjustable sewing temperature, comprising a machine base and a machine head mounted on the machine base, a needle bar assembly that can be driven up and down is mounted on one end of the machine head, the needle bar assembly comprises a needle bar and a needle mounted at the bottom of the needle bar, a first medium temperature adjustment flow channel is provided inside between the needle bar and the needle, a guide hole is provided on one side wall of the needle, a guide groove is provided at the bottom of the guide hole, a threading hole is provided on one side of the guide groove, the first medium temperature adjustment flow channel, the guide hole, the guide groove and the threading hole are connected in sequence, a presser foot rod for the needle to pass through is provided on one side of the needle bar assembly, the presser foot rod comprises a rod body and a pressure rod mounted at the bottom of the rod body, a second medium is provided inside between the rod body and the pressure rod Temperature regulating flow channel, the bottom of the pressure rod is provided with an arc-shaped presser foot or a ring-shaped presser foot, the arc-shaped presser foot is provided with an arc-shaped socket connected to the second medium temperature regulating flow channel, the ring-shaped presser foot is provided with an annular socket connected to the second medium temperature regulating flow channel, a needle plate is installed on the machine base, a pinhole plate for the machine needle to pass through is installed on the needle plate, a protruding structure is convexly provided on the bottom of the pinhole plate, the pinhole on the pinhole plate passes through the protruding structure, the third medium temperature regulating flow channel is respectively provided at both ends of the protruding structure, the side wall of the pinhole on the pinhole plate is provided with an annular groove connected to the third medium temperature regulating flow channel, the first medium temperature regulating flow channel, the second medium temperature regulating flow channel and the third medium temperature regulating flow channel are all connected to a medium supply source.

[0020] Preferably, a spindle motor is installed at one end of the machine head, a needle bar transmission mechanism is installed inside the machine head, the needle bar transmission mechanism is connected to the needle bar transmission, the spindle 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, a first medium inlet is opened at the top of the needle bar of the needle bar assembly, 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, one end of the first medium delivery pipe is connected to a first regulating valve, and the first regulating valve is connected to the medium supply source.

[0023] Preferably, a second medium inlet is opened at the top of the rod body of the presser foot rod, the second medium inlet is connected to a second medium delivery pipe, the second medium delivery pipe passes through the top of the machine head, one end of the second medium delivery pipe is connected to a second regulating valve, and the second regulating valve is connected to the medium supply source.

[0024] Preferably, the third medium temperature regulating flow channels at both ends of the raised structure of the pinhole plate are respectively connected to third medium delivery pipes, the third medium delivery pipes pass through the machine base, one end of the third medium delivery pipe is connected to a third regulating valve, and the third regulating valve is connected to the medium supply source.

[0025] Preferably, the first medium temperature control channel includes a needle bar medium temperature control channel opened inside the needle bar and a machine needle medium temperature control channel opened inside the machine needle, the needle bar medium temperature control channel is connected with the machine needle medium temperature control channel, the needle bar medium temperature control channel includes a needle bar medium storage channel opened in the upper part of the needle bar, a needle bar medium inflow channel connected to the bottom of the needle bar medium storage channel, and a machine needle installation channel connected to the bottom of the needle bar medium inflow channel, the machine needle is inserted on the machine needle installation channel, the machine needle medium temperature control channel includes a needle medium inflow channel opened at the upper end of the middle part of the machine needle and connected to the needle bar medium inflow channel, the bottom of the machine needle medium inflow channel is connected with a guide channel, the guide channel is inclined, and the guide channel is connected to the guide hole.

[0026] Preferably, the shaft and the pressure rod are detachably connected or integrally formed, the second medium temperature control flow channel includes a shaft medium temperature control channel opened inside the shaft and a pressure rod medium temperature control channel opened inside the pressure rod, the shaft medium temperature control channel and the pressure rod medium temperature control channel are connected, the bottom of the pressure rod has an arc-shaped presser foot or a ring-shaped presser foot, the arc-shaped presser foot is provided with an arc-shaped socket connected to the pressure rod medium temperature control channel, the ring-shaped presser foot is provided with an annular socket connected to the pressure rod medium temperature control channel, the middle part of the arc-shaped presser foot is provided with an arc-shaped needle threading hole for the machine needle to pass through, the arc-shaped socket is arranged on the arc-shaped needle threading hole, the middle part of the annular presser foot is provided with an annular needle threading hole for the machine needle to pass through, the annular socket is arranged on the annular needle threading hole, the shaft medium temperature control channel includes a 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 matching channel connected to one side of the shaft medium inflow channel, wherein the shaft medium matching channel is arranged on an outer wall of the shaft, and the pressure rod medium temperature regulating channel includes a pressure rod medium matching channel arranged on an inner wall of the pressure rod and a pressure rod medium inflow channel connected to one side of the pressure rod medium matching channel, one end of the shaft medium matching channel is fitted with and connected to one end of the pressure rod medium matching channel, the pressure rod medium inflow channel is arranged in an inclined shape, the pressure rod medium inflow channel is connected to an arc-shaped socket, or the pressure rod medium inflow channel is connected to an annular socket, and a transition curve is formed between the pressure rod medium inflow channel and the arc-shaped socket or between the pressure rod medium inflow channel and the annular socket.

[0027] Preferably, a clamping structure is provided at one end of the bottom of the rod body, a clamping groove is provided at one end of the top of the pressure rod, the clamping structure is clamped on the clamping groove, a threaded hole is provided in the clamping structure, and a gear groove is provided at the other end of the top of the pressure rod. The rod body and the pressure rod are connected together by a threaded portion of a bolt being threadedly connected to the threaded hole and the head of the bolt being pressed against one end of the gear groove. The medium matching channel of the rod body is provided on an outer wall of the clamping structure, and the medium matching channel of the pressure rod is provided on an inner wall of the clamping groove.

[0028] Preferably, the protruding structure has a stopper at one end and an inclined cutout at the other end.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention is provided with a needle bar assembly, and the first medium temperature adjustment flow channel between the needle bar and the machine needle can be passed with a medium for temperature adjustment, so that the temperature adjustment medium flows to the first medium temperature adjustment flow channel, the guide hole, the guide groove and the threading hole in sequence, and then flows to the sewing thread of the machine needle, so that the machine needle is quickly temperature adjusted;

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

[0032] Furthermore, the present invention is provided with a pinhole plate, and the third medium temperature control flow channels at both ends of the raised structure can be filled with the medium used for temperature control. When the needle moves downward, the annular groove of the pinhole plate controls the temperature around the sewing thread of the needle, and the needle is temperature controlled three times.

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

[0034] First, the temperature of the sewing thread of the needle is cooled by the flow of the temperature-regulating medium from the guide groove on one side of the needle to the sewing thread of the needle (the sewing thread passes through the threading hole). This structural setting does not hinder the field of vision of the sewing personnel, so that it is convenient for the sewing personnel to observe the sewing thread condition when the needle moves up and down, thereby facilitating the sewing personnel to adjust the sewing condition.

[0035] Second, the sewing thread of the machine needle can be temperature-controlled by the temperature-control medium flowing in the guide groove on the machine needle. When the machine needle moves downward, it will also be temperature-controlled by the arc-shaped or annular holes on the presser foot rod and the annular groove of the needle hole plate, so that the sewing thread of the machine needle can be temperature-controlled stably and at a fast speed.

[0036] Thirdly, further, the temperature regulating medium in the guide groove on the needle flows downward to the threading hole, and then flows to the sewing thread. The temperature regulating medium in the arc-shaped socket or annular socket or annular groove regulates the temperature of the environment around the sewing thread. This temperature regulating method will not cause the sewing thread to rotate and entangle disorderly, thereby ensuring 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 hole plate can be passed 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, and the scope of application is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0040] Figure 2 About Figure 1 The enlarged schematic diagram of the part pointed by the letter A;

[0041] Figure 3 1 is a schematic structural diagram of a needle bar assembly, a presser foot bar and a needle hole plate provided by an embodiment of the present invention;

[0042] Figure 4 It is a schematic diagram of the exploded structure of the needle bar assembly, the presser foot bar and the needle hole plate provided in an embodiment of the present invention;

[0043] Figure 5 is a front cutaway schematic diagram of a needle bar assembly, a presser foot bar and a needle hole plate provided by an embodiment of the present invention;

[0044] Figure 6 It is a front cutaway schematic diagram of the needle bar assembly, presser foot bar and needle hole plate after being disassembled provided by an embodiment of the present invention.

[0045] Included in the figure are:

[0046] 1. Machine base; 2. Machine head; 21. Spindle motor; 22. Needle bar transmission mechanism; 23. Height adjustment mechanism; 3. Needle bar assembly; 31. Needle bar; 32. Needle; 34. First medium inlet; 36. First medium temperature adjustment channel; 361. Needle bar medium temperature adjustment channel; 3611. Needle bar medium storage channel; 3612. Needle bar medium inflow channel; 3613. Needle installation channel; 362. Needle medium temperature adjustment channel; 3621. Needle medium inflow channel; 3622. Guide channel; 3623. Guide hole; 37. Guide groove; 38. Threading hole; 4. Presser foot rod; 41. Rod body; 411. Clamping structure; 412. Threaded hole; 42. Presser foot rod Rod; 421, snap-in groove; 422, shift groove; 43, ring-shaped presser foot; 430, ring-shaped needle hole cavity; 4300, ring-shaped socket; 44, second medium inlet; 45, second medium temperature control flow channel; 451, rod body medium temperature control channel; 4511, rod body medium storage channel; 4512, rod body medium inflow channel; 4513, rod body medium matching channel; 452, pressure rod medium temperature control channel; 4521, pressure rod medium matching channel; 4522, pressure rod medium inflow channel; 4523, transition curve; 5, pinhole plate; 51, protrusion structure; 52, third medium temperature control flow channel; 53, annular groove; 54, shift portion; 55, inclined incision. DETAILED DESCRIPTION

[0047] The technical scheme in this embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in this embodiment of the present invention. Obviously, the described embodiment is one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figures 1 to 6The embodiment of the present invention provides a sewing machine with adjustable sewing temperature, comprising a machine base 1 and a machine head 2 mounted on the machine base 1, a needle bar assembly 3 which can be driven up and down is mounted at one end of the machine head 2, the needle bar assembly 3 comprises a needle bar 31 and a needle 32 mounted at the bottom of the needle bar 31, a first medium temperature adjustment channel 35 is provided inside between the needle bar 31 and the needle 32, a guide hole 3623 is provided on one side wall of the needle 32, a guide groove 37 is provided at the bottom of the guide hole 3623, a threading hole 38 is provided on one side of the guide groove 37, the first medium temperature adjustment channel 35, the guide hole 3623, the guide groove 37 and the threading hole 38 are connected in sequence, a presser foot rod 4 for the needle 32 to pass through is mounted on one side of the needle bar assembly 3, the presser foot rod 4 comprises a rod body 41 and a pressure rod 42 mounted at the bottom of the rod body 41, a second medium temperature adjustment channel 35 is provided inside between the rod body 41 and the pressure rod 42 The pressure rod 42 has an arc-shaped presser foot or a ring-shaped presser foot 43 at the bottom, the arc-shaped presser foot is provided with an arc-shaped socket connected to the second medium temperature control flow channel 45, the ring-shaped presser foot 43 is provided with an annular socket 4300 connected to the second medium temperature control flow channel 45, a needle plate (not shown in the attached drawings) is mounted on the machine base 1, a pinhole plate 5 for the needle 32 to pass through is mounted on the needle plate, a protruding structure 51 is protruded from the bottom of the pinhole plate 5, the pinhole on the pinhole plate 5 passes through the protruding structure 51, and third medium temperature control flow channels 52 are respectively provided at both ends of the protruding structure 51, and the side wall of the pinhole on the pinhole plate 5 is provided with an annular groove 53 connected to the third medium temperature control flow channel 52, the first medium temperature control flow channel 35, the second medium temperature control flow channel 45 and the third medium temperature control flow channel 52 are all connected to a medium supply source (not shown in the attached drawings).

[0049] The medium supply source is used to provide a temperature regulating medium, which can be a gaseous medium or a liquid medium. The gaseous medium includes warm water vapor, high-temperature gas (some sewing materials are brittle in cold conditions, and the needle 32 needs to be heated to achieve better sewing effects), cold air (some sewing materials cause the needle 32 to be hot during sewing friction, which easily melts the sewing materials, and the needle 32 needs to be cooled down). The liquid medium includes liquid nitrogen (better cooling effect, suitable for expensive or new sewing materials).

[0050] A spindle motor 21 is installed at one end of the machine head 2, and 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 reciprocate up and down.

[0051] A height adjustment mechanism 23 is installed on one side of the needle bar transmission mechanism 22, and the pressure rod 42 is installed 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 structural composition and temperature regulation principle of the needle bar assembly 3 are as follows:

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

[0054] The first medium temperature control channel 36 includes a needle bar medium temperature control channel 361 opened in the needle bar 31 and a needle medium temperature control channel 362 opened in the needle 32, the needle bar medium temperature control channel 361 is connected with the needle medium temperature control channel 362, the needle bar medium temperature control 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 with the bottom of the needle bar medium storage channel 3611 and a needle bar medium inflow channel 3612 connected with the needle bar medium inflow channel 3612. The needle mounting channel 3613 is connected to the bottom of the medium inflow channel 3612, and the needle 32 is inserted on the needle mounting channel 3613. The needle medium temperature control channel 362 includes a needle medium inflow channel 3621 which is opened at the upper end of the middle part of the needle 32 and is connected to the needle bar medium inflow channel 3612. The bottom of the needle medium inflow channel 3621 is connected to a guide channel 3622, and the guide channel 3622 is inclined. The guide channel 3622 is connected to the guide hole 3623.

[0055] The diameter of the needle bar medium storage channel 3611 is larger than the needle bar medium inflow channel 3612. The larger diameter of the needle bar medium storage channel 3611 can ensure that the temperature control medium enters sufficiently and continuously, thereby ensuring stable temperature control. 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. Its functions are, first, to facilitate the temperature control medium to enter the needle bar medium inflow channel 3612, and second, to prevent a large amount of temperature control medium from entering the needle bar medium inflow channel 3612 and cracking due to stress concentration. 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 installation channel 3613.

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

[0057] The temperature control principle of the needle bar assembly 3 is as follows: the temperature control medium on the medium supply source flows to the first regulating valve, the first medium delivery pipeline, the first medium inlet 34, the needle bar medium storage channel 3611, the needle bar medium inflow channel 3612, the machine needle medium inflow channel 3621, the guide channel 3622, the guide hole 3623, the guide groove 37 and the threading hole 38 in sequence, wherein the supply amount of the medium supply source is controlled by the switch and size control of the first regulating valve, and when the temperature control medium comes to the threading hole 38, the bottom of the machine needle 32 and its sewing thread are effectively temperature-controlled.

[0058] The structural composition and temperature regulation principle of the presser foot rod 4 are as follows:

[0059] A second medium inlet 44 is provided at the top of the rod body 41 of the presser foot rod 4, and the second medium inlet 44 is connected to a second medium delivery pipeline (not shown in the drawings). The second medium delivery pipeline passes through the top of the machine head 2, and one end of the second medium delivery pipeline is connected to a second regulating valve (not shown in the drawings), and 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, and the second medium temperature control flow channel 45 includes a rod body medium temperature control channel 451 opened inside the rod body 41 and a pressure rod medium temperature control channel 452 opened inside the pressure rod 42, and the rod body medium temperature control channel 451 and the pressure rod medium temperature control channel 452 are connected. The bottom of the pressure rod 42 has an arc-shaped pressure foot (this embodiment is not shown in the drawings) or a ring-shaped pressure foot 43, and the arc-shaped pressure foot is provided with an arc-shaped socket hole ( The annular presser foot 43 is provided with an annular socket 4300 connected with the pressure rod medium temperature control channel 452, and the arc-shaped presser foot is provided with an arc-shaped needle threading hole cavity for the machine needle 32 to pass through in the middle (this embodiment is not shown in the accompanying drawings), the arc-shaped socket is arranged on the arc-shaped needle threading hole cavity, the annular presser foot 43 is provided with an annular needle threading hole cavity 430 for the machine needle 32 to pass through in the middle, the annular socket 4300 is arranged on the annular needle threading hole cavity 430, and the rod body medium temperature control channel 451 includes a hole opened on the rod body The shaft medium storage channel 4511 is provided at the upper end of the shaft medium storage channel 4511, the shaft medium inflow channel 4512 is connected to the bottom of the shaft medium storage channel 4511, and the shaft medium matching channel 4513 is connected to one side of the shaft medium inflow channel 4512. The shaft medium matching channel 4513 is provided on an outer side wall of the shaft 41. The pressure rod medium temperature regulating channel 452 includes a pressure rod medium matching channel 4521 provided on an inner side wall of the pressure rod 42, and a pressure rod medium matching channel 4521 is connected to one side of the pressure rod medium matching channel 4521. The medium flows into the channel 4522, one end of the medium matching channel 4513 of the rod body is fitted and connected with one end of the medium matching channel 4521 of the pressure rod, the medium inflow channel 4522 of the pressure rod is arranged in an inclined shape, the medium inflow channel 4522 of the pressure rod is connected with the arc-shaped socket, or the medium inflow channel 4522 of the pressure rod is connected with the annular socket 4300, and a transition bend 4523 is formed between the medium inflow channel 4522 of the pressure rod and the arc-shaped socket or between the medium inflow channel 4522 of the pressure rod and the annular socket 4300. The transition bend 4523 is arranged smoothly to ensure smooth outflow of the temperature regulating medium.

[0061] A clamping structure 411 is provided at one end of the bottom of the rod body 41, and a clamping groove 421 is opened at one end of the top of the pressure rod 42. The clamping structure 411 is clamped on the clamping groove 421, and a threaded hole 412 is opened in the clamping structure 411. A gear groove 422 is opened at the other end of the top of the pressure rod 42. The rod body 41 and the pressure rod 42 are connected together by the threaded portion of the bolt being threadedly connected to the threaded hole 412 and the head of the bolt being pressed against one end of the gear groove 422. The rod body medium matching channel 4513 is opened on an outer wall of the clamping structure 411, and the pressure rod medium matching channel 4521 is opened on an inner wall of the clamping groove 421.

[0062] The diameter of the shaft medium storage channel 4511 is larger than the shaft medium inflow channel 4512. The shaft medium storage channel 4511 has a larger diameter, which can ensure that the temperature control medium enters sufficiently and continuously, thereby ensuring stable temperature control. Furthermore, a transition chamfer is provided at the connection between the shaft medium storage channel 4511 and the shaft medium inflow channel 4512, which has the following functions: first, it is conducive to the temperature control medium entering the shaft medium inflow channel 4512, and second, it prevents a large amount of temperature control medium from entering the shaft medium inflow channel 4512 and cracking due to stress concentration.

[0063] The temperature control principle of the presser foot rod 4 is as follows: the temperature control medium on the medium supply source flows in sequence to the second regulating valve, the second medium delivery pipeline, the second medium inlet 44, the shaft medium storage channel 4511, the shaft medium inflow channel 4512, the shaft medium matching channel 4513, the pressure rod medium matching channel 4521, the pressure rod medium inflow channel 4522, the transition curve 4523, the arc-shaped socket or the annular socket 4300, and the arc-shaped needle hole cavity or the annular needle hole cavity 430, wherein the supply amount of the medium supply source is controlled by the switch and size control of the second regulating valve, and when the sewing machine is sewing and the needle 32 passes through the arc-shaped needle hole cavity or the annular needle hole cavity 430, the temperature control medium effectively controls the temperature of the needle 32 and its sewing thread.

[0064] The structural composition and temperature regulation principle of the pinhole plate 5 are as follows:

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

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

[0067] The temperature control principle of the pinhole plate 5 is as follows: the temperature control medium on the medium supply source flows to the third regulating valve, the third medium delivery pipeline, the third medium temperature control flow channel 52 at both ends of the protruding structure 51 of the pinhole plate 5, the annular groove 53 and the pinhole wall on the pinhole plate 5 in sequence. The supply amount of the medium supply source is controlled by switching and controlling the size of the third regulating valve. When the sewing machine is sewing and the needle 32 passes through the pinhole wall of the pinhole plate 5, the temperature control medium effectively controls the temperature of the needle 32 and its sewing thread.

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

[0069] The above-mentioned presser foot rod 4, if the rod body 41 and the pressure rod 42 are detachably connected, the rod body 41 and the pressure rod 42 are respectively machined or die-cast and then spliced ​​together; if the rod body 41 and the pressure rod 42 are integrally formed, the rod body 41 and the pressure rod 42 are first assembled and formed, and then integrally welded and bonded.

[0070] The pinhole plate 5 can be injection molded or machined. When machining is performed, the third medium temperature regulating channels 52 at both ends are opened first, and then the annular groove 53 is machined by an internal milling cutter.

[0071] The sewing machine with adjustable sewing temperature of the present invention has the following advantages:

[0072] First, the temperature of the bottom of the needle 32 and its sewing line is cooled by the temperature-regulating medium on the guide groove 37 on one side of the needle 32 flowing to the sewing line of the needle 32 (the sewing line passes through the threading hole 38). This structural setting does not hinder the field of vision of the sewing personnel, so that it is convenient for the sewing personnel to observe the sewing condition when the needle 32 moves up and down, thereby facilitating the sewing personnel to adjust the sewing condition;

[0073] Second, the needle 32 and its sewing thread can be temperature-controlled by the temperature-control medium flowing in the guide groove 37 on the needle 32. When the needle 32 moves downward, it is also temperature-controlled by the arc-shaped or annular hole 4300 on the presser foot rod 4 and the annular groove 53 of the needle hole plate 5, so that the sewing thread of the needle 32 is temperature-controlled stably and at a fast speed.

[0074] Third, further, the temperature-control medium in the guide groove 37 on the needle 32 flows downward to the threading hole 38, and then flows to the sewing thread. The temperature-control medium in the arc-shaped socket or the annular socket 4300 and the annular groove 53 controls the temperature of the environment around the sewing thread. This temperature control method will not cause the sewing thread to rotate and entangle in a disorderly manner, thereby improving the sewing quality.

[0075] Fourth, the first medium temperature regulating channel 35 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 hole plate 5 can be passed 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, and the scope of application is wider.

[0076] The above are only 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 in the protection scope of the present invention.

Claims

1. A sewing machine with adjustable sewing temperature, comprising a machine base (1) and a machine head (2) mounted on the machine base (1), characterized in that: A needle bar assembly (3) that can be driven up and down is installed at one end of the machine head (2), and the needle bar assembly (3) includes a needle bar (31) and a machine needle (32) installed at the bottom of the needle bar (31), a first medium temperature adjustment flow channel (35) is provided inside between the needle bar (31) and the machine needle (32), a guide hole (3623) is provided on one side wall of the machine needle (32), a guide groove (37) is provided at the bottom of the guide hole (3623), and one side of the guide groove (37) is provided with a guide hole (3623). A threading hole (38) is provided, the first medium temperature regulating flow channel (35), the guide hole (3623), the guide groove (37) and the threading hole (38) are sequentially connected, a presser foot rod (4) is installed on one side of the needle bar assembly (3) for the machine needle (32) to pass through, the presser foot rod (4) comprises a rod body (41) and a pressure rod (42) installed at the bottom of the rod body (41), and a second medium temperature regulating flow channel (45) is provided inside between the rod body (41) and the pressure rod (42). ), the bottom of the pressure rod (42) has an arc-shaped pressure foot or an annular pressure foot (43), the arc-shaped pressure foot is provided with an arc-shaped socket hole connected to the second medium temperature control flow channel (45), the annular pressure foot (43) is provided with an annular socket hole (4300) connected to the second medium temperature control flow channel (45), the machine base (1) is provided with a needle plate, the needle plate is provided with a pinhole plate (5) for the machine needle (32) to pass through, the pinhole plate (5) is convexly provided at the bottom A protruding structure (51) is provided, the pinhole on the pinhole plate (5) penetrates the protruding structure (51), third medium temperature regulating flow channels (52) are respectively provided at both ends of the protruding structure (51), an annular groove (53) connected to the third medium temperature regulating flow channel (52) is provided on the side wall of the pinhole on the pinhole plate (5), and the first medium temperature regulating flow channel (35), the second medium temperature regulating flow channel (45) and the third medium temperature regulating flow channel (52) are all connected to a medium supply source.

2. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: A spindle motor (21) is installed at one end of the machine head (2), and a needle bar transmission mechanism (22) is installed inside the machine head (2). The needle bar transmission mechanism (22) is in transmission connection with 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 reciprocate up and down.

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

4. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: A first medium inlet (34) is provided at the top of the needle bar (31) of the needle bar assembly (3). The first medium inlet (34) is connected to a first medium delivery pipeline. The first medium delivery pipeline passes through the top of the machine head (2). One end of the first medium delivery pipeline is connected to a first regulating valve, and the first regulating valve is connected to a medium supply source.

5. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: A second medium inlet (44) is provided at the top of the rod body (41) of the presser foot rod (4), and the second medium inlet (44) is connected to a second medium delivery pipeline, and the second medium delivery pipeline passes through the top of the machine head (2), and one end of the second medium delivery pipeline is connected to a second regulating valve, and the second regulating valve is connected to the medium supply source.

6. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: The third medium temperature regulating flow channels (52) at both ends of the protruding structure (51) of the pinhole plate (5) are respectively connected to third medium delivery pipelines, the third medium delivery pipeline passes through the machine base (1), one end of the third medium delivery pipeline is connected to a third regulating valve, and the third regulating valve is connected to the medium supply source.

7. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: The first medium temperature control channel (36) includes a needle bar medium temperature control channel (361) opened in the needle bar (31) and a machine needle medium temperature control channel (362) opened in the machine needle (32), the needle bar medium temperature control channel (361) is connected to the machine needle medium temperature control channel (362), the needle bar medium temperature control channel (361) includes a needle bar medium storage channel (3611) opened in the upper section 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 (3611). A needle mounting channel (3613) is connected to the bottom of the channel (3612), and the needle (32) is inserted into the needle mounting channel (3613). The needle medium temperature control channel (362) includes a needle medium inflow channel (3621) which is opened at the upper middle end of the needle (32) and is connected to the needle bar medium inflow channel (3612). The bottom of the needle medium inflow channel (3621) is connected to a guide channel (3622), and the guide channel (3622) is inclined. The guide channel (3622) is connected to the guide hole (3623).

8. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: The rod body (41) and the pressure rod (42) are detachably connected or integrally formed, the second medium temperature control channel (45) comprises a rod body medium temperature control channel (451) opened inside the rod body (41) and a pressure rod medium temperature control channel (452) opened inside the pressure rod (42), the rod body medium temperature control channel (451) and the pressure rod medium temperature control channel (452) are connected, the bottom of the pressure rod (42) has an arc-shaped pressure foot or a ring-shaped pressure foot (43), and the arc-shaped pressure foot is provided with an arc-shaped socket connected to the pressure rod medium temperature control channel (452), The annular presser foot (43) is provided with an annular socket (4300) connected to the pressure rod medium temperature control channel (452); the arc-shaped presser foot is provided with an arc-shaped needle hole cavity for the machine needle (32) to pass through in the middle; the arc-shaped socket is arranged on the arc-shaped needle hole cavity; the annular presser foot (43) is provided with an annular needle hole cavity (430) for the machine needle (32) to pass through in the middle; the annular socket (4300) is arranged on the annular needle hole cavity (430); the shaft medium temperature control channel (451) includes a shaft medium storage channel opened at the upper end of the shaft (41); The pressure rod medium temperature regulating channel (452) comprises a pressure rod medium matching channel (4521) provided 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 matching channel (4521). ), one end of the shaft medium matching channel (4513) is fitted and connected with one end of the pressure rod medium matching channel (4521), the pressure rod medium inflow channel (4522) is arranged in an inclined shape, the pressure rod medium inflow channel (4522) is connected with the arc-shaped socket, or the pressure rod medium inflow channel (4522) is connected with the annular socket (4300), and a transition curve (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).

9. A sewing machine with adjustable sewing temperature according to claim 8, characterized in that: A clamping structure (411) is provided at one end of the bottom of the rod body (41), and a clamping groove (421) is provided at one end of the top of the pressure rod (42). The clamping structure (411) is clamped on the clamping groove (421), and a threaded hole (412) is provided on the clamping structure (411). A shifting groove (422) is provided at the other end of the top of the pressure rod (42). The rod body (41) and the pressure rod (42) are connected together by a threaded portion of a bolt being threadedly connected to the threaded hole (412) and a head of the bolt being pressed against one end of the shifting groove (422). The medium matching channel (4513) of the rod body is provided on an outer wall of the clamping structure (411), and the medium matching channel (4521) of the pressure rod is provided on an inner wall of the clamping groove (421).

10. A sewing machine with adjustable sewing temperature according to claim 1, characterized in that: The protruding structure (51) has a stopper portion (54) at one end and an inclined cutout (55) at the other end.

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