Double needle mechanism and double needle sewing machine

Abstract

The double-needle mechanism comprises two needle rod supports, a sliding support and a support shaft. Each needle rod support is independently provided with a needle rod slidingly installed thereon. The two needle rods are respectively connected with a machine needle at one end of the corresponding needle rod support. The support shaft is connected with the two needle rods and can drive the two machine needles to make reciprocating movement relative to the needle rod support along the axial direction of the needle rod. The two needle rod supports are slidingly installed on the sliding support so that the distance between the two needle rod supports can be adjusted by sliding the two needle rod supports on the sliding support. The double-needle mechanism can adjust the distance between the two needle rod supports, i.e. the needle position, to meet the requirements of different garment processes and avoid the problems caused by replacing the machine needle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewing, in particular to a double needle mechanism and a double needle sewing machine. BACKGROUND

[0002] The double needle sewing machine is a commonly used sewing machine that can produce two parallel lock stitches, and the sewing efficiency is twice that of an ordinary flat bed sewing machine.

[0003] At present, the two needles of the existing double needle sewing machine are fixed on the needle bar clamp assembly, so that the distance between the two needles is fixed. When the double needle sewing machine is used to sew pockets, tents, reflective clothing, etc., the distance between the two sewing lines is directly determined by different clothing process requirements. Therefore, when the needle position of the double needle sewing machine does not match the clothing process, the needle holder part needs to be replaced to change the distance between the two needles. However, the above-mentioned method of replacing the needle holder part to adjust the distance between the two needles will cause the following problems: 1. After replacing the needle holder, the machine needs to be debugged again, which is tedious, and the assembly of the needle holder also has certain requirements. Because the height of the needle holder determines whether the shuttle can hook the thread, if the height of the replaced needle holder is too high, the needle plane position will be higher than the shuttle tip when the shuttle hooks the thread, and the shuttle will not be able to hook the thread ring, resulting in needle skipping; and the needle position also needs to be adjusted when locking the needle, so that the needle plane is directly opposite the shuttle. 2. There are many types of needle holders, and it is troublesome to purchase needle holders. Moreover, there is a problem that the needle position of the needle holder does not match the required clothing process. SUMMARY

[0004] Therefore, it is necessary to provide a double needle mechanism and a double needle sewing machine to solve the above technical problems.

[0005] A double needle mechanism comprises two needle bar supports, a sliding support and a support shaft, wherein each of the needle bar supports is independently provided, each of the needle bar supports is slidably mounted with a needle bar, and each of the needle bars is connected with a needle at one end of the corresponding needle bar support.

[0006] The support shaft is connected to the two needle bars, and along the axial direction of the needle bar, the support shaft can drive the two needles to reciprocate relative to the needle bar support through the two needle bars.

[0007] The two needle bar supports are slidably mounted on the sliding support, so that the distance between the two needle bar supports can be adjusted by sliding the two needle bar supports on the sliding support.

[0008] In the application, through the reasonable structure setting of the two needle bar supports, the sliding support and the support shaft, the two needle bars of the double needle mechanism are independently arranged, on the basis of meeting the reciprocating movement of the two needle bars along the needle bar axial direction by the support shaft, the spacing between the two needle bar supports is adjusted, that is, the needle position of the double needle mechanism is adjusted, so as to adapt to the needs of different clothing process needle positions, and meanwhile, the related problems caused by replacing the needle are avoided.

[0009] In one of the embodiments, two toothed racks are respectively installed on the end faces of the two needle bar supports away from the corresponding needle bars, a gear piece is rotatably installed on the sliding support, the gear piece is arranged between the two toothed racks and is in meshing cooperation with the two toothed racks respectively, and the gear piece can synchronously drive the two needle bar supports to move towards or away from each other through the two toothed racks.

[0010] It can be understood that through the structure setting of the toothed racks and the gear piece, the driving of the two needle bar supports towards or away from each other during the operation of the double needle mechanism is realized, that is, one embodiment of the needle position adjustment during the operation of the double needle mechanism is realized.

[0011] In one of the embodiments, a locking piece is respectively connected to each of the two needle bar supports, a long hole is formed in the sliding support, the locking piece passes through the corresponding long hole and extends out, and the locking piece can lock the two needle bar supports to the sliding support respectively.

[0012] It can be understood that through the structure setting of the locking piece, the locking and positioning of the needle bar supports on the sliding support are realized, so as to meet the use requirement of the adjustable spacing between the two needle bar supports.

[0013] In one of the embodiments, a boss is arranged on the needle bar support, a step face of the boss abuts against the toothed rack and is installed on the needle bar support, a step cooperation face is arranged on the sliding support, and another step face of the boss cooperates with the step cooperation face to guide the installation of the needle bar support to the sliding support.

[0014] It can be understood that through the structure setting of the boss, the installation of the toothed rack to the needle bar support and the installation of the needle bar support to the sliding support are facilitated, and the assembly precision between the toothed rack and the gear piece is ensured, so as to avoid the situation that the toothed rack and the gear piece are stuck or severely worn.

[0015] In one of the embodiments, a needle bar connecting column is installed on the needle bar, the support shaft is connected to the needle bar through the needle bar connecting column, and the support shaft can drive the needle bar to reciprocate relative to the needle bar support through the needle bar connecting column.

[0016] The support shaft is in sliding connection with the needle rod connecting column, and the needle rod support can drive the needle rod to slide relative to the sliding support along the axial direction of the support shaft.

[0017] It can be understood that the assembly connection between the support shaft and the needle rod is realized through the structure of the needle rod connecting column, and the use requirement that the two needle rod supports slide on the sliding support and adjust the distance between them is met.

[0018] In one of the embodiments, the support shaft is rotatably connected with a needle rod connecting rod on both sides of the two needle rods, and the two needle rod connecting rods are matched to drive the support shaft to reciprocate relative to the needle rod support.

[0019] It can be understood that the movement of the support shaft during the operation of the double-needle mechanism is driven through the structure of the two needle rod connecting rods.

[0020] In one of the embodiments, the double-needle mechanism further comprises a needle rod crank shaft, and one end of the two needle rod connecting rods away from the support shaft is rotatably installed on the needle rod crank shaft, so that the needle rod crank shaft, the two needle rod connecting rods and the support shaft are combined and formed into a rectangular frame structure.

[0021] It can be understood that the movement of the two needle rod connecting rods is driven through the structure of the needle rod crank shaft, and the structural stability of the double-needle mechanism during the driving of the support shaft is ensured.

[0022] In one of the embodiments, the double-needle mechanism further comprises a first connecting shaft, a first needle rod crank, a second needle rod crank and a second connecting shaft, the first needle rod crank and the second needle rod crank are symmetrically installed on both sides of the needle rod crank shaft, the first needle rod crank is installed on the first connecting shaft, and the second needle rod crank is installed on the second connecting shaft.

[0023] The center line of the first connecting shaft is collinear with the center line of the second connecting shaft, and the needle rod crank shaft is eccentrically arranged relative to the first connecting shaft and the second connecting shaft.

[0024] It can be understood that the movement inertia of the two needles during the operation of the double-needle mechanism is increased through the structure of the first connecting shaft, the first needle rod crank, the second needle rod crank and the second connecting shaft, so as to improve the structural stability and improve the needle puncture force.

[0025] In one of the embodiments, the double needle mechanism further comprises a thread tension lever, a thread tension lever pin and a thread tension lever connecting column, the thread tension lever is rotatably mounted on the thread tension lever pin, and the thread tension lever is connected to the needle rod crank shaft through the thread tension lever connecting column, so that the needle rod crank shaft can drive the thread tension lever to rotate on the thread tension lever pin through the thread tension lever connecting column.

[0026] It can be understood that through the structure of the thread tension lever, the thread tension lever pin and the thread tension lever connecting column, the function of the thread tension lever winding and unwinding during the operation of the double needle mechanism is realized, which has the effects of simplifying the structure and facilitating assembly.

[0027] The application also claims a double needle sewing machine comprising a machine shell and a double needle mechanism, the double needle mechanism is mounted on the machine shell; the double needle mechanism is provided as any of the double needle mechanisms described above.

[0028] In the application, through the reasonable structure of the double needle mechanism, the needle position of the double needle sewing machine can be adjusted to meet the needs of different garment processes, and related problems caused by replacing the needle are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a partial structure schematic diagram of the double needle sewing machine provided by one embodiment of the application.

[0030] Figure 2 It is a partial structure schematic diagram of another working state of the double needle sewing machine provided by one embodiment of the application.

[0031] Figure 3 It is a structure schematic diagram of the double needle mechanism in the application.

[0032] Figure 4 It is a structure schematic diagram of another perspective of the double needle mechanism in the application.

[0033] Figure 5 It is a partial exploded view of the double needle mechanism in the application.

[0034] Figure 6 、 Figure 7 It is a structure schematic diagram of different embodiments of the sliding connection between the needle rod support and the sliding support in the application.

[0035] Figure 8 It is a partial structure schematic diagram of the double needle mechanism in the application.

[0036] Figure 9 It is another partial structure schematic diagram of the double needle mechanism in the application.

[0037] Figure 10 It is a structure schematic diagram of the needle rod and the needle rod connecting column in the application.

[0038] Figure 11 、 Figure 12 Structure diagram of different embodiments of needle bar and needle bar connecting column in the application.

[0039] Wherein, 10, needle bar support; 11, boss; 20, sliding support; 21, long hole; 22, step matching surface; 30, support shaft; 40, needle bar; 41, upper needle bar sleeve; 42, lower needle bar sleeve; 43, needle bar connecting column; 50, needle bar connecting rod; 60, needle bar crank shaft; 71, first connecting shaft; 72, first needle bar crank; 73, second needle bar crank; 74, second connecting shaft; 741, bearing seat; 742, bearing; 81, thread lifting lever; 82, thread lifting lever pin; 83, thread lifting lever connecting column; 831, first snap spring; 91, rack; 92, gear part; 921, screw groove; 922, second snap spring; 93, sliding block; 94, rotary driving part; 95, locking part; 100, double needle mechanism; 101, machine needle; 102, machine needle chuck; 200, machine shell; 210, through hole; 201, rubber plug; 202, plastic cover. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the application will be clearly and completely described in connection with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0041] It should be noted that when an element is referred to as being "arranged on" another element, it can be directly arranged on the other element or there can be a middle element. When an element is referred to as being "arranged on" another element, it can be directly arranged on the other element or there can be a middle element. When an element is referred to as being "fixed on" another element, it can be directly fixed on the other element or there can be a middle element.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] Please refer to Figures 1 to 12 The application claims a double needle sewing machine, which comprises a machine shell 200 and a double needle mechanism 100, and the double needle mechanism 100 is installed on the machine shell 200.

[0044] The double needle mechanism 100 provided by an embodiment of the present application comprises two needle bar supports 10, a sliding support 20 and a support shaft 30.

[0045] In the present application, the two needle bar supports 10 are independently arranged, wherein each needle bar support 10 is slidably mounted with a needle bar 40, and the two needle bars 40 are respectively connected with a machine needle 101 at the end extending out of the corresponding needle bar support 10, which can be detachably mounted on the corresponding needle bar 40 through a machine needle chuck 102. It should be noted that the machine needle chuck 102 of the present application can adopt the conventional machine needle chuck 102 in the prior art, which will not be described here.

[0046] The needle bar 40 is slidably mounted on the needle bar support 10 through a needle bar upper sleeve 41 and a needle bar lower sleeve 42, so that the needle bar 40 can slide along the axial direction of the needle bar 40 relative to the needle bar support 10 through the needle bar upper sleeve 41 and the needle bar lower sleeve 42.

[0047] The support shaft 30 is connected to the two needle bars 40, and along the axial direction of the needle bar 40, the support shaft 30 can simultaneously drive the two machine needles 101 to reciprocate relative to the needle bar support 10 through the two needle bars 40, that is, to drive the two machine needles 101 to simultaneously reciprocate up and down, so as to meet the use requirements of the double needle mechanism 100 applied to the double needle sewing machine.

[0048] In one embodiment, the needle bar 40 is mounted with a needle bar connecting column 43, the support shaft 30 is connected to the needle bar 40 through the needle bar connecting column 43, and the support shaft 30 can drive the needle bar 40 to reciprocate relative to the needle bar support 10 through the needle bar connecting column 43, so as to specifically realize the assembly connection between the support shaft 30 and the needle bar 40.

[0049] It can be understood that the needle bar connecting column 43 is mounted on the needle bar 40 to realize the fixed connection between the needle bar connecting column 43 and the needle bar 40, which can reduce the assembly difficulty and part processing difficulty between the needle bar connecting column 43 and the needle bar 40.

[0050] The support shaft 30 and the needle bar connecting column 43 are slidably connected, and along the axial direction of the support shaft 30, the needle bar support 10 can drive the needle bar 40 to slide relative to the sliding support 20, that is, the needle bar connecting column 43 and the support shaft 30 are slidably connected to meet the use requirements of the needle bar support 10 sliding on the sliding support 20 and adjusting the distance therebetween. It should be noted that the hole on the needle bar connecting column 43 for the support shaft 30 to pass through can be arranged on the outer side of the needle bar 40, or the support shaft 30 can simultaneously penetrate the needle bar 40 and the needle bar connecting column 43, which will not be described here.

[0051] In one embodiment, the support shaft 30 is rotatably connected with a needle bar connecting rod 50 on both sides of the two needle bars 40, and the two needle bar connecting rods 50 are matched to drive the support shaft 30 to reciprocate relative to the needle bar support 10, thereby specifically realizing the driving of the support shaft 30 during the operation of the double-needle mechanism 100. It should be noted that the number of needle bar connecting rods 50 is not limited to two, and for those skilled in the art, the number of needle bar connecting rods 50 can be set to one, in which the two ends of the support shaft 30 are respectively slidably arranged on the guide frame, thereby ensuring that the needle bar connecting rod 50 can drive the two needle bars 40 to move relative to the needle bar support 10 during operation, which will not be described here.

[0052] It can be understood that during the operation of the double-needle mechanism 100, the two needle bar connecting rods 50 need to move synchronously when the support shaft 30 drives the two needle bars 40 to move up and down, and the two needle bars 40 are driven to reciprocate on the needle bar support 10 under the guidance of the sliding fit between the needle bar 40 and the needle bar support 10.

[0053] In one embodiment, the double-needle mechanism 100 further includes a needle bar crank shaft 60, and the ends of the two needle bar connecting rods 50 away from the support shaft 30 are rotatably mounted on the needle bar crank shaft 60. Specifically, the needle bar crank shaft 60 can be rotatably mounted on the needle bar crank shaft 60 by a needle bearing (not shown), so that the needle bar crank shaft 60, the two needle bar connecting rods 50 and the support shaft 30 form a rectangular frame structure, thereby specifically realizing the driving of the two needle bar connecting rods 50 and ensuring the structural stability of the double-needle mechanism 100 during the driving of the support shaft 30.

[0054] In one embodiment, the double-needle mechanism 100 further includes a first connecting shaft 71, a first needle bar crank 72, a second needle bar crank 73 and a second connecting shaft 74. The first needle bar crank 72 and the second needle bar crank 73 are symmetrically mounted on both sides of the needle bar crank shaft 60, the first needle bar crank 72 is mounted on the first connecting shaft 71, and the second needle bar crank 73 is mounted on the second connecting shaft 74. The center line of the first connecting shaft 71 is collinear with the center line of the second connecting shaft 74, and the needle bar crank shaft 60 is eccentrically arranged relative to the first connecting shaft 71 and the second connecting shaft 74, so that during the operation of the double-needle mechanism 100, the rotation of the first connecting shaft 71 can drive the needle bar crank shaft 60 to rotate through the first needle bar crank 72. In this process, the second needle bar crank 73 and the second connecting shaft 74 rotate synchronously, which can increase the inertia of the two needles 101 during the operation of the double-needle mechanism 100, thereby improving the structural stability and enhancing the piercing force of the needle 101.

[0055] The first connecting shaft 71 is rotatably mounted on the casing 200, and the second connecting shaft 74 is mounted on the casing 200 through a bearing seat 741, wherein a bearing 742 is arranged between the bearing seat 741 and the second connecting shaft 74, so as to specifically realize the rotational connection of the second connecting shaft 74 on the casing 200; and the first needle bar crank 72 and the second needle bar crank 73 are symmetrically arranged on both sides of the needle bar crank shaft 60, so that the double-needle mechanism 100 can drive the movement of the two needle bar links 50 by the eccentricity of the needle bar crank shaft 60 and the first connecting shaft 71 and the second connecting shaft 74 when the double-needle mechanism 100 works.

[0056] The double-needle mechanism 100 further comprises a thread tension lever 81, a thread tension lever pin 82, and a thread tension lever connecting column 83. The thread tension lever 81 is rotatably mounted on the thread tension lever pin 82, and the thread tension lever 81 is connected to the needle bar crank shaft 60 through the thread tension lever connecting column 83, so that the needle bar crank shaft 60 can drive the thread tension lever 81 to rotate on the thread tension lever pin 82 through the thread tension lever connecting column 83, thereby specifically realizing the function of the thread tension lever 81 for winding and unwinding thread when the double-needle mechanism 100 works, and simplifying the structure and facilitating assembly.

[0057] The thread tension lever pin 82 is mounted on the casing 200, one end of the thread tension lever connecting column 83 is sleeved on the needle bar crank shaft 60 and is limited by a first snap spring 831 to prevent the thread tension lever connecting column 83 from moving along the axial direction of the needle bar crank shaft 60 on the needle bar crank shaft 60; and the other end of the thread tension lever connecting column 83 cooperates with the thread tension lever 81, so that the thread tension lever connecting column 83 can drive the thread tension lever 81 to rotate on the thread tension lever pin 82 with the rotation of the needle bar crank shaft 60.

[0058] As can be seen from the above, the two needle bar supports 10 in the double-needle mechanism 100 are independently arranged, and the two needle bar supports 10 are slidably mounted on the sliding support 20, so that the distance between the two needle bar supports 10 can be adjusted by sliding the two needle bar supports 10 on the sliding support 20, that is, the distance between the two needles 101 on the double-needle mechanism 100 can be adjusted, thereby enabling the double-needle sewing machine with the double-needle mechanism 100 to be applicable to different garment process needle positions, and avoiding related problems caused by replacing the needles.

[0059] In one of the embodiments, the two needle bar supports 10 are respectively provided with a rack 91 on the end face away from the corresponding needle bar 40, the sliding support 20 is rotatably provided with a gear member 92 between the two racks 91 and respectively engaged with the two racks 91, and the gear member 92 can synchronously drive the two needle bar supports 10 to move towards or away from each other through the two racks 91, so as to specifically realize the driving of the two needle bar supports 10 to move towards or away from each other when the double-needle mechanism 100 works, that is, to realize one of the embodiments of the needle position adjustment when the double-needle mechanism 100 works. It should be noted that the sliding connection between the two needle bar supports 10 and the sliding support 20 is not limited to the one shown in the figure, and for those skilled in the art, the needle bar support 10 can be slidably mounted on the sliding support 20 through a sliding block 93, wherein the sliding of the two needle bar supports 10 on the sliding support 20 can be realized by synchronously driving the two sliding blocks 93 through a rotary driving member 94 (such as a cam, a jaw or a connecting rod), specifically, when the rotary driving member 94 rotates around the center point of the rotary driving member 94, the sliding of the two sliding blocks 93 on the sliding support 20 is realized through the connection between the rotary driving member 94 and the two sliding blocks 93, that is, the driving of the two needle bar supports 10 to move towards or away from each other on the sliding support 20 is achieved, which will not be described here.

[0060] In order to facilitate the rotary driving of the gear member 92 on the sliding support 20, the gear member 92 of the present application is provided with a screw groove 921 on the end face away from the needle bar support 10, so that when working, a screwdriver can be used to act on the screw groove 921 of the gear member 92, and the rotary driving of the gear member 92 relative to the sliding support 20 can be realized.

[0061] Among them, the gear member 92 is rotatably installed on the sliding support 20 through concave-convex cooperation, and a second snap spring 922 is used for limiting to prevent the gear member 92 from being detached from the sliding support 20, and the part of the gear member 92 between the needle bar support 10 and the sliding support 20 is engaged with the two gear members 92, so that the gear member 92 can drive the two racks 91 to move towards or away from each other through the meshing structure between the gear member 92 and the two racks 91 while rotating on the sliding support 20.

[0062] In one of the embodiments, the two needle bar supports 10 are respectively connected with locking members 95, the sliding support 20 is provided with long holes 21, the locking members 95 pass through the corresponding long holes 21 and extend out, and the locking members 95 can lock the two needle bar supports 10 to the sliding support 20, so as to specifically realize the locking and positioning of the needle bar supports 10 on the sliding support 20, so as to meet the use requirement that the distance between the two needle bar supports 10 is adjustable. It should be noted that the locking member 95 of the present application is specifically provided as a screw rod, and two screw rods are respectively arranged on each needle bar support 10, so as to ensure the stability of the locking of the needle bar support 10 on the sliding support 20.

[0063] It should be noted that the double-needle sewing machine of the present application is provided with through holes 210 on the machine shell 200, which are matched with the gear member 92 and the locking member 95, and a rubber plug 201 and a plastic cover 202 are respectively detachably installed at the position of each through hole 210, so that when the distance between the two needles 101 needs to be adjusted during the operation of the double-needle sewing machine, the rubber plug 201 and the plastic cover 202 can be first detached from the machine shell 200, the locking member 95 is loosened, and then the purpose of adjusting the distance between the two needles 101 is realized by screwing the gear member 92 on the sliding support 20 through the screwdriver, and finally the locking member 95 is locked.

[0064] In one of the embodiments, the needle bar support 10 is provided with a boss 11, the rack 91 is attached to a step surface of the boss 11 and is installed on the needle bar support 10, the sliding support 20 is provided with a step matching surface 22, and the other step surface of the boss 11 cooperates with the step matching surface 22 to guide the installation of the needle bar support 10 to the sliding support 20, so as to facilitate the installation of the rack 91 to the needle bar support 10 and the installation of the needle bar support 10 to the sliding support 20; and also ensure the assembly precision between the rack 91 and the gear member 92, so as to avoid the situation that the rack 91 and the gear member 92 are stuck or severely worn.

[0065] In addition, it should be noted that the sliding support 20 is detachably installed on the machine shell 200, so that during the assembly of the double-needle sewing machine, the two needle bar supports 10 and the sliding support 20 can be connected as a whole, and the sliding support 20 is assembled on the machine shell 200, so as to facilitate the installation of the double-needle mechanism 100 to the machine shell 200.

[0066] In summary, the double needle mechanism and the double needle sewing machine of the present application can adjust the needle position of the double needle sewing machine to meet the requirements of different garment processes, and avoid the problems caused by replacing the needle. The sliding adjustment of the two needle rod supports 10 on the sliding support 20 is realized by the meshing of the rack 91 and the gear 92, thereby realizing the adjustment of the distance between the two needles 101 of the double needle sewing machine, and further expanding the use range of different garment process needle positions that can be used by the double needle sewing machine during operation.

[0067] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not conflict, they should be considered within the scope of the present application.

[0068] Those skilled in the art should recognize that the above embodiments are used to illustrate the present application, but not as a limitation of the present application. Any appropriate changes and variations to the above embodiments within the spirit and principles of the present application are within the scope of the present application.

Claims

1. A double needle mechanism characterized by, The device comprises two needle rod supports (10), a sliding support (20) and a support shaft (30), the two needle rod supports (10) are independently arranged, each of the needle rod supports (10) is slidably connected with a needle rod (40), and each of the two needle rods (40) is connected with a machine needle (101) at one end of the corresponding needle rod support (10); The support shaft (30) is connected with the two needle rods (40), and along the axial direction of the needle rods (40), the support shaft (30) can drive the two machine needles (101) to make reciprocating motion relative to the needle rod supports (10) through the two needle rods (40). The two needle rod supports (10) are slidably arranged on the sliding support (20), so that the distance between the two needle rod supports (10) can be adjusted by the sliding of the two needle rod supports (10) on the sliding support (20). The needle rod supports (10) are slidably arranged on the sliding support (20) through sliding blocks (93), and the sliding of the two needle rod supports (10) on the sliding support (20) is realized by the synchronous driving of the two sliding blocks (93) through a rotary driving element (94), wherein the rotary driving element (94) is connected with the two sliding blocks (93). The needle rod supports (10) are provided with bosses (11), the sliding blocks (93) are attached to the step surfaces of the bosses (11), the sliding support (20) is provided with a step matching surface (22), and the other step surface of the boss (11) is matched with the step matching surface (22) to guide the installation of the needle rod supports (10) on the sliding support (20). One of the sliding blocks (93) is fixedly connected with one of the needle rod supports (10) and attached to the step surface of the boss (11) of the other needle rod support (10).

2. The double needle mechanism of claim 1, wherein, The needle rods (40) are provided with needle rod connecting columns (43), the support shaft (30) is connected with the needle rods (40) through the needle rod connecting columns (43), and the support shaft (30) can drive the needle rods (40) to make reciprocating motion relative to the needle rod supports (10) through the needle rod connecting columns (43). The support shaft (30) is slidably connected with the needle rod connecting columns (43), and along the axial direction of the support shaft (30), the needle rod supports (10) can drive the needle rods (40) to slide relative to the sliding support (20).

3. The double needle mechanism of claim 1, wherein, The support shaft (30) is rotatably connected with a needle rod connecting rod (50) through the two sides of the two needle rods (40), and the two needle rod connecting rods (50) can drive the support shaft (30) to make reciprocating motion relative to the needle rod supports (10).

4. The double needle mechanism of claim 3, wherein, Further comprising a needle bar crank shaft (60), two ends of the needle bar connecting rods (50) away from the support shaft (30) are respectively rotatably installed on the needle bar crank shaft (60), so that the needle bar crank shaft (60), the two needle bar connecting rods (50) and the support shaft (30) are enclosed and formed into a rectangular frame structure.

5. The double needle mechanism of claim 4, wherein, Further comprising a first connecting shaft (71), a first needle bar crank (72), a second needle bar crank (73) and a second connecting shaft (74), the first needle bar crank (72) and the second needle bar crank (73) are symmetrically installed on both sides of the needle bar crank shaft (60), the first needle bar crank (72) is installed on the first connecting shaft (71), and the second needle bar crank (73) is installed on the second connecting shaft (74). Wherein, the center line of the first connecting shaft (71) is collinear with the center line of the second connecting shaft (74), and the needle bar crank shaft (60) is eccentrically arranged relative to the first connecting shaft (71) and the second connecting shaft (74).

6. The double needle mechanism of claim 5, wherein, Further comprising a thread lifting lever (81), a thread lifting frame pin (82) and a thread lifting lever connecting column (83), the thread lifting lever (81) is rotatably installed on the thread lifting frame pin (82), and the thread lifting lever (81) is connected to the needle bar crank shaft (60) through the thread lifting lever connecting column (83), so that the needle bar crank shaft (60) can drive the thread lifting lever (81) to rotate on the thread lifting frame pin (82) through the thread lifting lever connecting column (83).

7. A twin needle sewing machine comprising a machine housing (200) and a twin needle mechanism (100) mounted on the machine housing (200); characterized in that, The double needle mechanism (100) is arranged as the double needle mechanism (100) in any one of claims 1-6.

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