A gearbox

Abstract

The transmission box comprises a box body, a driving shaft rotatably connected to one side of the box body, a thread tensioning mechanism, a thread shifting mechanism and a needle bending mechanism, wherein the thread tensioning mechanism comprises a thread guide, a thread tensioning rod and a first transmission assembly, the thread guide is provided with a thread guide hole, the thread tensioning rod is located beside the thread guide, the driving shaft can drive the thread tensioning rod to reciprocate up and down through the first transmission assembly when the driving shaft rotates, and the thread tensioning rod is provided with a thread tensioning hole; the thread shifting mechanism comprises a thread shifting hook and a second transmission assembly, the driving shaft can drive the thread shifting hook to reciprocate along the horizontal direction through the second transmission assembly when the driving shaft rotates; the needle bending mechanism comprises a needle and a third transmission assembly, the needle is provided with a thread passing channel extending along the length direction of the needle, and the driving shaft can drive the needle to move close to or away from the thread shifting hook through the third transmission assembly when the driving shaft rotates.

Description

TECHNICAL FIELD

[0001] The present application relates to a sewing device, in particular to a transmission box. BACKGROUND

[0002] In the sewing process, the existing sewing machine usually uses a rotating hook to achieve a lock stitch, and the rotating hook needs to be filled with a bobbin thread before use. During use, the thread in the rotating hook is guided to the straight needle and cooperates with the rotating hook to complete the sewing process. When applied to automatic production, the amount of thread that can be unwound in the rotating hook is small, and it needs to be replaced frequently, which seriously affects production efficiency.

[0003] In order to adapt to automatic production, some sewing machines appear on the market, which are equipped with thread lifting and thread shifting mechanisms. An external thread spool can directly unwind and pass through the thread lifting and thread shifting mechanisms on the sewing machine to complete the lock stitch. However, in actual application, the thread lifting and thread shifting mechanisms are relatively fixed on the sewing machine and are difficult to adjust adaptively. Therefore, in order to adapt to different production needs, different sewing machines often need to be equipped, which increases production costs. SUMMARY

[0004] The present application aims to provide a transmission box to solve one or more technical problems existing in the prior art, at least to provide a beneficial choice or create conditions.

[0005] The solution to the technical problem of the present application is:

[0006] A transmission box, comprising: a box body, one side of which is rotatably connected with a driving shaft; a thread lifting mechanism, comprising a thread guide, a thread lifting rod and a first transmission assembly, the thread guide being connected to the outside of the box body, the thread guide being provided with a thread guide hole, the thread lifting rod being located beside the thread guide, the thread lifting rod being connected to the driving shaft through the first transmission assembly, the driving shaft being able to drive the thread lifting rod to reciprocate up and down through the first transmission assembly when the driving shaft rotates, the thread lifting rod being provided with a thread lifting hole; a thread shifting mechanism, comprising a thread shifting hook and a second transmission assembly, the thread shifting hook being connected to the driving shaft through the second transmission assembly, the driving shaft being able to drive the thread shifting hook to reciprocate in the horizontal direction through the second transmission assembly when the driving shaft rotates; a curved needle mechanism, comprising a curved needle and a third transmission assembly, the curved needle having a thread passing channel extending in the length direction of the curved needle, the curved needle being connected to the driving shaft through the third transmission assembly, the driving shaft being able to drive the curved needle to approach or move away from the thread shifting hook through the third transmission assembly when the driving shaft rotates.

[0007] The technical scheme has at least the following beneficial effects: the driving source of the external device is connected to the driving shaft, power is input through the driving shaft, the unwound sewing thread is sequentially threaded through the guide hole, the thread tensioning hole, the transition hole, and then is led out through the threading channel, during operation, when the driving source of the external device drives the driving shaft to rotate, the power input from the driving shaft drives the thread tensioning rod to reciprocate up and down through the first transmission assembly, drives the thread hook to reciprocate along the horizontal direction through the second transmission assembly, and drives the curved needle to move close to or away from the thread hook through the third transmission assembly, when the sewing thread passes through the guide hole, the guide hole plays a role of stabilizing the sewing thread, when the straight needle of the external device moves downward, the thread hook moves along the horizontal direction to push the sewing thread away, and the curved needle moves away from the thread hook, when the straight needle moves upward, the thread hook reverses along the horizontal direction to reset, and the curved needle moves close to the thread hook to reset, and in this process, the thread tensioning rod up and down moves the sewing thread led out from the guide hole, so that the sewing thread led out from the curved needle is kept in a tensioned state, thereby stably realizing lock-type trajectory sewing, so that multiple functions are integrated into one, greatly facilitating the modification of the sewing machine, and multiple structures are driven by one driving source, thereby reducing the driving structure and the overall size, so that the entire sewing machine is more simple, and the transmission box is installed in the sewing machine head to replace the original rotating hook assembly, and the sewing process is completed by cooperating with the straight needle on the sewing machine.

[0008] As a further improvement of the above technical scheme, the first transmission assembly comprises a thread tensioning arm, a thread tensioning shaft, a first eccentric wheel and a thread tensioning transmission member, the thread tensioning shaft is rotationally connected in the box body, the rotation axis of the thread tensioning shaft and the rotation axis of the driving shaft both extend along the left-right direction, the first eccentric wheel is eccentrically connected to the driving shaft, one end of the thread tensioning transmission member is sleeved on the outside of the first eccentric wheel through a first bearing, the other end of the thread tensioning transmission member is rotationally connected to one end of the thread tensioning arm, the middle part of the thread tensioning arm is connected to the thread tensioning shaft, the thread tensioning rod is connected to the other end of the thread tensioning arm, the outer wall of the box body is provided with an avoiding hole, the avoiding hole extends along the up-down direction around the rotation axis of the thread tensioning shaft, the end of the thread tensioning rod away from the thread tensioning arm extends out of the box body from the avoiding hole, and the thread tensioning hole is located outside the box body. When the driving shaft rotates, the eccentric wheel rotates in the thread tensioning transmission member, the thread tensioning transmission member is sleeved on the outside of the first eccentric wheel through the first bearing, one end of the thread tensioning transmission member is rotationally connected to one end of the thread tensioning arm, and the middle part of the thread tensioning arm is connected to the thread tensioning shaft, so that the power of the eccentric wheel transmitted to the thread tensioning arm through the thread tensioning transmission member is converted into the up-down swinging power of one end of the thread tensioning arm, and the thread tensioning rod swings up and down in the avoiding hole to avoid interference between the thread tensioning rod and the box body.

[0009] As a further improvement of the above technical solution, the third transmission assembly comprises a transmission wheel, a first connecting rod, a second connecting rod and a transmission shaft, the transmission wheel is connected to the drive shaft, one end of the first connecting rod is rotatably connected to the transmission wheel, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, the transmission shaft is rotatably connected to the outside of the box, the curved needle is arranged on the transmission shaft, one end of the transmission shaft extends into the box and is connected to the other end of the second connecting rod, the rotation axes of the first connecting rod, the second connecting rod and the transmission shaft all extend along the left-right direction. When the drive shaft rotates, it drives the transmission wheel to rotate, and the rotation of the transmission wheel drives one end of the first connecting rod to rotate around the drive shaft, and the first connecting rod and the second connecting rod form a two-connecting-rod mechanism, which can convert the continuous one-way rotation of the drive shaft into the forward and reverse rotation of the transmission shaft, thereby driving the curved needle to approach or move away from the wire hook.

[0010] As a further improvement of the above technical solution, the part of the transmission shaft outside the box is connected to a transmission seat, and the curved needle is detachably connected to the transmission seat. The transmission seat serves as a transfer structure for connecting and mounting the curved needle, and can conveniently disassemble, replace and maintain the curved needle.

[0011] As a further improvement of the above technical solution, the second transmission assembly comprises a wire shifting shaft, a second eccentric wheel, a wire shifting guide rod, a wire shifting transmission member and a wire shifting block, the wire shifting shaft is rotatably connected in the box, the rotation axis of the wire shifting shaft extends along the up-down direction, the wire shifting shaft and the drive shaft are connected by gears, the second eccentric wheel is eccentrically connected to the wire shifting shaft, one end of the wire shifting transmission member is sleeved with a second bearing on the outside of the second eccentric wheel, the wire shifting block is rotatably connected to the other end of the wire shifting transmission member, the rotation axis of the wire shifting block extends along the up-down direction, the wire shifting guide rod is slidably connected to the outside of the box, the wire shifting hook is arranged on the wire shifting guide rod, one end of the wire shifting guide rod extends into the box and is connected to the wire shifting block. When the drive shaft rotates, power is transmitted to the wire shifting shaft through the gear, driving the wire shifting shaft to rotate, the wire shifting shaft drives the second eccentric wheel to rotate in the wire shifting transmission member, since the wire shifting block is rotatably connected to one end of the wire shifting transmission member, the wire shifting guide rod is slidably connected to the outside of the box along the left-right direction, and the wire shifting guide rod and the wire shifting block are connected to each other, so that the rotation of the second eccentric wheel in the wire shifting transmission can be converted into driving the wire shifting guide rod to slide left and right, thereby driving the wire shifting hook to reciprocate along the horizontal direction.

[0012] As a further improvement of the above technical solution, the part of the wire shifting guide rod outside the box is connected to a wire shifting seat, the wire shifting sheet is detachably connected to the wire shifting seat, and the wire shifting hook is connected to the wire shifting sheet. The wire shifting seat serves as a transfer structure for connecting the wire shifting sheet and the wire shifting guide rod, and can conveniently disassemble, replace and maintain the wire shifting sheet.

[0013] As a further improvement of the above technical solution, the wire pushing block is connected with no less than two wire pushing guide rods. No less than two wire pushing guide rods can improve the activity limitation of the wire pushing block, so that the wire pushing block can output the driving force of left and right sliding more stably to drive the wire pushing guide rods to slide left and right.

[0014] As a further improvement of the above technical solution, the wire guide frame comprises a front wire segment, a transition segment and a rear wire segment, the front wire segment and the rear wire segment are connected to the transition segment in the front-rear direction, one end of the front wire segment is connected to the box body, the wire guide holes are arranged on the front wire segment and the rear wire segment, and the thread lifting rod is located between the front wire segment and the rear wire segment. The sewing thread first passes through the wire guide hole on the front wire segment, then enters the thread lifting hole, and then passes out of the wire guide hole on the rear wire segment, so that the sewing thread input before the thread lifting action and the sewing thread output after the thread lifting action can be stabilized respectively, and the stability of the operation of pushing the sewing thread is greatly improved.

[0015] As a further improvement of the above technical solution, the curved needle, the wire pushing hook, the wire guide hole and the thread lifting hole are arranged in multiple in the left-right direction. In use, the sewing thread passing through the wire guide hole passes through one thread lifting hole, and one curved needle cooperates with one wire pushing hook to realize the coordinated action, when the curved needle, the wire pushing hook, the wire guide hole and the thread lifting hole have multiple, multiple needles can work at the same time, and the working efficiency of the whole machine is greatly improved.

[0016] As a further improvement of the above technical solution, the box body is connected with a wire guide plate, the wire guide plate is provided with a transition hole, and the wire guide plate is located between the curved needle and the wire guide frame. The sewing thread after the thread lifting passes through the transition hole on the wire guide plate, and the transition hole is used to realize the transition, reversing, transfer and other functions of the sewing thread, so that the sewing thread routing is more clear, and the mutual interference between the sewing thread and the internal structure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly described below. Obviously, the described drawings are only part of the embodiments of the present application, and not all embodiments, and those skilled in the art can obtain other design schemes and drawings according to these drawings without creative labor.

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is a schematic diagram of the internal structure of the box body of the present application;

[0020] Figure 3 is a schematic diagram of the structure of the present application without the box body.

[0021] In the drawings: 100 - case, 110 - drive shaft, 210 - wire holder, 211 - wire hole, 220 - threader lever, 221 - threader hole, 231 - threader arm, 232 - threader shaft, 233 - first eccentric, 234 - threader transmission, 310 - bobbin, 311 - threading passage, 321 - transmission wheel, 322 - first link, 323 - second link, 324 - transmission shaft, 325 - transmission seat, 410 - wire hook, 421 - wire shaft, 422 - wire guide, 423 - wire transmission, 424 - wire block, 430 - wire seat, 440 - wire piece, 500 - wire plate, 510 - transition hole, 600 - fixing plate. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and are not to be construed as limiting the present application.

[0023] In the description of the present application, it is to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not to indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0024] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood to not include the number, above, below, etc. are understood to include the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0025] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0026] Reference Figure 1 , Figure 2 With Figure 3A transmission box, comprising a box body 100, in which three parts are mainly integrated: a thread lifting mechanism, a thread shifting mechanism and a needle bending mechanism, the box body 100 has a driving shaft 110 for transmitting external power, the driving shaft 110 is connected to the side wall of the box body 100 through a bearing, the thread lifting mechanism, the thread shifting mechanism and the needle bending mechanism are all driven by the power transmitted by the driving shaft 110 to move, and the lock trajectory stitching is completed.

[0027] The thread lifting mechanism comprises a thread guide 210, a thread lifting rod 220 and a first transmission assembly, the thread guide 210 is connected to the outside of the box body 100, the thread guide 210 is provided with a thread guide hole 211, the thread lifting rod 220 is located beside the thread guide 210, the thread lifting rod 220 is connected to the driving shaft 110 through the first transmission assembly, the driving shaft 110 can drive the thread lifting rod 220 to reciprocate up and down through the first transmission assembly when rotating, and the thread lifting rod 220 is provided with a thread lifting hole 221.

[0028] The thread shifting mechanism comprises a thread shifting hook 410 and a second transmission assembly, the thread shifting hook 410 is connected to the driving shaft 110 through the second transmission assembly, and the driving shaft 110 can drive the thread shifting hook 410 to reciprocate along the horizontal direction through the second transmission assembly when rotating.

[0029] The needle bending mechanism comprises a needle 310 and a third transmission assembly, the needle 310 has a thread passing channel 311 extending along the length direction thereof, the needle 310 is connected to the driving shaft 110 through the third transmission assembly, and the driving shaft 110 can drive the needle 310 to move close to or away from the thread shifting hook 410 through the third transmission assembly when rotating.

[0030] As can be seen from the above, the driving source of the external device is connected to the driving shaft 110, such as the driving motor of the external device is drivingly connected to the driving shaft 110, and the sewing thread unwound is sequentially threaded through the guide hole 211, the thread tensioning hole 221, the transition hole 510 and then led out through the threading passage 311. During operation, when the driving source of the external device drives the driving shaft 110 to rotate, the power input from the driving shaft 110 drives the thread tensioning rod 220 to reciprocate up and down through the first transmission assembly, drives the thread hook 410 to reciprocate horizontally through the second transmission assembly, and drives the curved needle 310 to move away from or close to the thread hook 410 through the third transmission assembly. When the sewing thread passes through the guide hole 211, the guide hole 211 plays a role in stabilizing the sewing thread. When the straight needle of the external device moves downward, the thread hook 410 moves horizontally to push the sewing thread away, and the curved needle 310 moves away from the thread hook 410. When the straight needle moves upward, the thread hook 410 reverses its direction and moves horizontally to reset, and the curved needle 310 moves close to the thread hook 410 to reset. In this process, the thread tensioning rod 220 moves up and down to tension the sewing thread led out of the guide hole 211, so that the lock-type trajectory sewing can be stably achieved. In this way, multiple functions are integrated into one, which greatly facilitates the modification of the sewing machine, and multiple structures can be driven by one driving source, reducing the driving structure and the overall size, so that the entire sewing machine is more compact. The transmission box is installed in the sewing machine head to replace the original rotating hook assembly, and the straight needle of the sewing machine cooperates to complete the sewing process.

[0031] The first transmission assembly is mainly used to convert the rotary driving force output by the driving shaft 110 into a driving force for driving the thread tensioning rod 220 to reciprocate. Its structure has various forms, such as a reciprocating swing mechanism composed of a cam and a rocker. In this embodiment, the first transmission assembly includes a thread tensioning arm 231, a thread tensioning shaft 232, a first eccentric wheel 233, and a thread tensioning transmission member 234. Two bearing seats can be installed on the inner bottom side of the box body 100, and the thread tensioning shaft 232 passes through the two bearing seats, so that the thread tensioning shaft 232 is rotatably connected to the box body 100. The rotation axis of the thread tensioning shaft 232 and the rotation axis of the driving shaft 110 both extend in the left-right direction. The first eccentric wheel 233 is eccentrically connected to the driving shaft 110. The thread tensioning transmission member 234 has a first mounting hole. After a first bearing is installed in the first mounting hole, the first bearing is sleeved on the outer side of the first eccentric wheel 233. A first shaft sleeve can be installed in the thread tensioning transmission member 234. A first positioning pin is connected to the other end of the thread tensioning transmission member 234. The first positioning pin is inserted into the first shaft sleeve and can rotate in the first shaft sleeve, so that the thread tensioning transmission member 234 is rotatably connected to one end of the thread tensioning arm 231. The middle part of the thread tensioning arm 231 is fixed on the thread tensioning shaft 232. The thread tensioning rod 220 is connected to the other end of the thread tensioning arm 231. The thread tensioning hole 221 is located outside the box body 100.

[0032] In this embodiment, when the driving shaft 110 rotates, the eccentric wheel rotates in the thread tensioning transmission member 234, and since the thread tensioning transmission member 234 is arranged outside the first eccentric wheel 233 through the first bearing sleeve and one end of the thread tensioning transmission member 234 is rotatably connected to one end of the thread tensioning arm 231 and the middle part of the thread tensioning arm 231 is connected to the thread tensioning shaft 232, the power of the eccentric wheel is transmitted to the thread tensioning arm 231 through the thread tensioning transmission member 234, and the power is converted into the up-and-down swinging power of one end of the thread tensioning arm 231, and the thread tensioning rod 220 at the other end of the thread tensioning arm 231 can be driven to swing up and down.

[0033] Furthermore, the outer side wall of the box body 100 is provided with a relief hole extending along the up-and-down direction around the rotation axis of the thread tensioning shaft 232, and one end of the thread tensioning rod 220 away from the thread tensioning arm 231 extends out of the box body 100 from the relief hole, and the thread tensioning rod 220 moves in the relief hole when swinging up and down, so as to avoid the interference between the thread tensioning rod 220 and the box body 100.

[0034] The third transmission assembly is mainly used for converting the rotary driving force output by the driving shaft 110 into the driving force for driving the hook needle 310 to reciprocating rotate, and the structure forms thereof are various, such as the reciprocating swinging mechanism composed of a cam and a rocker. In some embodiments, the third transmission assembly comprises a transmission wheel 321, a first connecting rod 322, a second connecting rod 323 and a transmission shaft 324, the transmission wheel 321 is fixed on the driving shaft 110, one end of the first connecting rod 322 is rotatably connected to the transmission wheel 321, the other end of the first connecting rod 322 is rotatably connected to one end of the second connecting rod 323, and the rotatable connection structure of the first connecting rod 322 and the transmission wheel 321 and the rotatable connection structure of the first connecting rod 322 and the second connecting rod 323 can be realized through the mutual cooperation between different groups of second positioning pins and second positioning sleeves, the second positioning pin is connected to any one of the first connecting rod 322 and the second connecting rod 323 and the first connecting rod 322 and the transmission wheel 321, and the second positioning sleeve is connected to the other one, one end of the transmission shaft 324 can be connected to the outer side of the box body 100 through a bearing, the hook needle 310 is relatively fixed on the transmission shaft 324, one end of the transmission shaft 324 extends into the box body 100 and is connected to the other end of the second connecting rod 323, so that the transmission structure for driving the transmission shaft 324 to rotate is protected in the box body 100, and the rotation axes of the first connecting rod 322, the second connecting rod 323 and the transmission shaft 324 all extend along the left-and-right direction.

[0035] In this embodiment, when the driving shaft 110 rotates, the transmission wheel 321 is driven to rotate, the transmission wheel drives one end of the first connecting rod 322 to rotate around the driving shaft 110, and the first connecting rod 322 and the second connecting rod 323 form a two-connecting-rod mechanism, which can convert the continuous one-way rotation of the driving shaft 110 into the forward and reverse rotation of the transmission shaft 324, so as to drive the hook needle 310 to move close to or away from the thread hook 410.

[0036] The curved needle 310 is a rod-shaped structure extending along an arc direction close to the thread hook 410. The curved needle 310 has a base fixedly installed on the bottom side of the curved needle 310. In some embodiments, the thread passing channel 311 can be formed along the arc extending direction of the curved needle 310 and pass through both ends of the curved needle 310. In some embodiments, the thread passing channel 311 can be formed from the side away from the thread hook 410 and an outlet hole in communication with the thread passing channel 311 can be formed on the side wall of the curved needle 310 close to the thread hook 410. After the sewing thread is passed into the thread passing channel 311 from one end, the sewing thread can be led out from the outlet hole.

[0037] In the above embodiments, the curved needle 310 can be directly fixed on the transmission shaft 324. In order to facilitate the installation and removal of the curved needle 310, in the present embodiment, the part of the transmission shaft 324 outside the box body 100 is connected with a transmission seat 325, and the curved needle 310 is detachably connected to the transmission seat 325. A connecting member such as a screw or a bolt can be screwed into the base to connect to the transmission seat 325, thereby achieving the relative fixation of the curved needle 310 and the transmission seat 325. In this way, the transmission seat 325 serves as a transfer structure for the installation and connection of the curved needle 310, and the curved needle 310 can be conveniently disassembled and replaced. In actual application, a plurality of curved needles 310 can be installed on the transmission seat 325 in the horizontal direction.

[0038] The second transmission assembly is mainly used for converting the rotating driving force output by the driving shaft 110 into driving force for driving the wire poking hook 410 to reciprocate horizontally. The structure thereof can be various, such as a reciprocating swing mechanism composed of a cam and a rocker. In some embodiments, the second transmission assembly comprises a wire poking shaft 421, a second eccentric wheel, a wire poking guide rod 422, a wire poking transmission member 423 and a wire poking block 424. The wire poking shaft 421 is connected to the inner top wall of the box body 100 through a bearing, and a bearing can be additionally arranged at the middle part of the wire poking shaft 421 for connecting with the inner side wall of the box body 100, so as to realize stable rotary connection with the box body 100. The rotating axis of the wire poking shaft 421 extends in the up-down direction. A bevel gear is fixed on the bottom end of the wire poking shaft 421 and the driving shaft 110 respectively. The wire poking shaft 421 and the driving shaft 110 are transmissionally connected through the two bevel gears, so as to conduct the power of the driving shaft 110 to the wire poking shaft 421. The second eccentric wheel can be provided with a second mounting hole, and the second mounting hole is provided with a bearing. The second eccentric wheel is eccentrically fixed on the wire poking shaft 421, and the second eccentric wheel is fixed in the inner ring of the bearing of the second mounting hole. The wire poking block 424 and the wire poking transmission member 423 can be rotationally connected through the cooperation of a third shaft sleeve and a third positioning pin. The third positioning pin can rotate in the third shaft sleeve, so as to realize the rotary connection between the wire poking block 424 and the wire poking transmission member 423. One of the third shaft sleeve and the third positioning pin is connected to the wire poking block 424, and the other is connected to the wire poking transmission member 423. The rotating axis of the wire poking block 424 extends in the up-down direction. The wire poking guide rod 422 is slidingly connected to the outer side of the box body 100. The wire poking guide rod 422 can be connected to the outer side of the box body 100 through a sliding bearing, or a shaft sleeve can be arranged in the outer side of the box body 100, and the wire poking guide rod 422 can slide through the shaft sleeve. The wire poking hook 410 is relatively fixed on the wire poking guide rod 422. One end of the wire poking guide rod 422 extends into the box body 100 and is connected to the wire poking block 424, so as to protect the transmission structure for driving the wire poking guide rod 422 to move into the box body 100.

[0039] In some embodiments, when the driving shaft 110 rotates, the power is transmitted to the wire poking shaft 421 through the gear, so as to drive the wire poking shaft 421 to rotate. The wire poking shaft 421 drives the second eccentric wheel to rotate in the wire poking transmission member 423. Since the wire poking block 424 is rotationally connected to one end of the wire poking transmission member 423, the wire poking guide rod 422 is slidingly connected to the outer side of the box body 100 in the left-right direction, and the wire poking guide rod 422 and the wire poking block 424 are connected to each other, the rotation of the second eccentric wheel in the wire poking transmission member 423 can be converted into driving the wire poking guide rod 422 to slide left and right, so as to drive the wire poking hook 410 to reciprocate horizontally.

[0040] In actual application, the first eccentric wheel 233 and the second eccentric wheel can have the same structure. Specifically, the first eccentric wheel 233 is composed of two annular sleeves and an arc-shaped sleeve arranged along the axial direction. An eccentric hole is formed on the annular sleeve to allow the driving shaft 110 or the thread shifting shaft 421 to pass through, so that the first eccentric wheel 233 is eccentrically connected to the driving shaft 110 or the thread shifting shaft 421. The inner ring of the first bearing or the second bearing is sleeved on the annular sleeve. In addition, the arc-shaped sleeve is connected to the end face of the annular sleeve. A through hole can be formed on the arc-shaped sleeve, and a transmission member such as a bolt or a transmission key is inserted into the through hole and connected to the driving shaft 110 or the thread shifting shaft 421, so that the first eccentric wheel 233 and the second eccentric wheel can be better synchronized and connected, and the thread shifting member 234 or the thread shifting member 423 can be conveniently assembled. The annular sleeve and the arc-shaped sleeve can be designed in a split type or integrally cast.

[0041] In order to fix the thread shifting hook 410 relative to the thread shifting shaft 421, the part of the thread shifting guide rod 422 located outside the box body 100 is connected with a thread shifting seat 430. The thread shifting seat 430 is detachably connected with a thread shifting piece 440, and the thread shifting piece 440 is connected with the thread shifting hook 410. The thread shifting seat 430 serves as a transfer structure for connecting the thread shifting piece 440 and the thread shifting guide rod 422, so that the thread shifting piece 440 can be conveniently disassembled, replaced and maintained. In addition, the thread shifting piece 440 can be fixed relative to the thread shifting seat 430 by means of a connecting member such as a screw or a bolt. In actual application, the thread shifting hook 410 and the thread shifting piece 440 can be designed in a split type, or the thread shifting hook 410 can be extended from the thread shifting piece 440, and the thread shifting hook 410 and the thread shifting piece 440 can be designed in an integral type. The thread shifting piece 440 is horizontally arranged, and the thread shifting hook 410 is arranged on the thread shifting piece 440 and faces away from the box body 100.

[0042] In order to improve the stability of the movement of the thread shifting block 424, in the present embodiment, the thread shifting block 424 is connected with not less than two thread shifting guide rods 422. The not less than two thread shifting guide rods 422 can improve the activity limitation of the thread shifting block 424, so that the thread shifting block 424 can more stably output the driving force for left and right sliding to drive the thread shifting guide rod 422 to slide left and right. In actual application, only one thread shifting guide rod 422 can be used to connect the thread shifting seat 430, and the other thread shifting guide rod 422 can only slide left and right relative to the box body 100. Alternatively, both thread shifting guide rods 422 can be connected with the thread shifting seat 430.

[0043] In the above embodiment, the wire guide 210 can be located on one side of the thread tensioner 220, such as the side of the sewing thread before entering the thread tensioner 220. In order to further improve the stability of the sewing thread feeding, in the present embodiment, the wire guide 210 includes a front wire segment, a transition segment, and a rear wire segment. The front wire segment and the rear wire segment are spaced apart in the front-rear direction and connected to the transition segment. One end of the front wire segment is fixed relative to the box body 100. A screw can be passed through the end of the front wire segment away from the transition segment. The screw is used to press and fix the entire wire guide 210 on the box body 100. A slot hole extending in the up-down direction can also be provided on the front wire segment. The screw passes through the slot hole and is then connected to the box body 100. In this way, the height of the wire guide 210 can be adjusted before use, and the use is more flexible. The front wire segment and the rear wire segment are both provided with wire holes 211. The thread tensioner 220 is located between the front wire segment and the rear wire segment.

[0044] In the present embodiment, the sewing thread first passes through the wire hole 211 on the front wire segment, enters the thread tension hole 221, and then passes out of the wire hole 211 on the rear wire segment. In this way, the input sewing thread before the thread tensioning action and the output sewing thread after the thread tensioning action can be stabilized respectively, greatly improving the stability of the sewing thread threading and other operations.

[0045] In use, the sewing thread that has passed through the wire hole 211 passes through a thread tension hole 221, and a corresponding thread tensioning hook 410 and a corresponding bent needle 310 implement coordinated action, which is equivalent to a group consisting of a thread tension hole 221, corresponding wire holes 211 on the front and rear sides of the thread tension hole 221, a bent needle 310, and a thread tensioning hook 410. In the present embodiment, the bent needle 310, the thread tensioning hook 410, the wire hole 211, and the thread tension hole 221 are arranged in multiple numbers in the left-right direction. When the bent needle 310, the thread tensioning hook 410, the wire hole 211, and the thread tension hole 221 have multiple numbers, multiple working groups can be formed, and multiple needles can work simultaneously, greatly improving the working efficiency of the entire machine.

[0046] In order to better guide the sewing thread, in the present embodiment, the box body 100 is connected with a wire guide plate 500. The wire guide plate 500 is provided with a transition hole 510 and is located between the bent needle 310 and the wire guide 210. The sewing thread after tensioning passes through the transition hole 510 on the wire guide plate 500. The transition hole 510 is used to transition, reverse, and transfer the sewing thread, so that the sewing thread routing is more clear, and the mutual interference between the sewing thread and the internal structure is reduced. In actual application, the transition hole 510 can have multiple numbers and match different working groups respectively.

[0047] In some embodiments, a fixing plate 600 can also be arranged on the other side of the transmission shaft 324, and the fixing plate 600 is fixed to one side of the box 100 by a fixing rod. A mounting space is formed between the fixing plate 600 and the box 100, and the structural members outside the box 100, such as the thread guide rod 220, the thread guide frame 210, the curved needle 310, and the thread hook 410, can be arranged in the mounting space, so that the structure can be better protected. The transmission shaft 324 can be rotatably connected to the fixing plate 600 by a bearing, further improving the stability of the transmission shaft 324.

[0048] The bearings, the first bearings, and the second bearings mentioned in the above embodiments are all rolling bearings, which are mainly used to reduce the relative friction between two structural members. The rolling bearings mainly include an outer ring, an inner ring, and rolling bodies. The rolling bodies are located between the outer ring and the inner ring. The structural member arranged on the outer side is connected to the outer side of the outer ring, and the structural member arranged on the inner side is connected to the inner side of the inner ring. The rolling bodies can reduce the friction between the two structural members when they rotate relative to each other.

[0049] The preferred embodiments of the application are specifically described above, but the application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A transmission case characterised in that: The utility model relates to a thread tensioning device of a sewing machine, which comprises a box (100) having a driving shaft (110) rotatably connected to one side thereof, a thread guide frame (210) connected to the outside of the box (100), a thread guide hole (211) provided on the thread guide frame (210), a thread tensioning lever (220) located beside the thread guide frame (210), the thread tensioning lever (220) being connected to the driving shaft (110) through a first transmission assembly, the driving shaft (110) being capable of driving the thread tensioning lever (220) to reciprocate up and down through the first transmission assembly when the driving shaft (110) rotates, the thread tensioning lever (220) being provided with a thread tensioning hole (221), the first transmission assembly comprising a thread tensioning arm (231), a thread tensioning shaft (232), a first eccentric wheel (233) and a thread tensioning transmission member (234), the thread tensioning shaft (232) being rotatably connected to the box (100), the rotation axes of the thread tensioning shaft (232) and the driving shaft (110) extending in the left-right direction, the first eccentric wheel (233) being eccentrically connected to the driving shaft (110), one end of the thread tensioning transmission member (234) being sleeved with a first bearing on the outside of the first eccentric wheel (233), the other end of the thread tensioning transmission member (234) being rotatably connected to one end of the thread tensioning arm (231), the middle part of the thread tensioning arm (231) being connected to the thread tensioning shaft (232), the thread tensioning lever (220) being connected to the other end of the thread tensioning arm (231), the outside wall of the box (100) being provided with an avoiding hole extending in the up-down direction around the rotation axis of the thread tensioning shaft (232), the end of the thread tensioning lever (220) away from the thread tensioning arm (231) extending out of the box (100) from the avoiding hole, the thread tensioning hole (221) being located outside the box (100), a thread hooking member (410) connected to the driving shaft (110) through a second transmission assembly, the driving shaft (110) being capable of driving the thread hooking member (410) to reciprocate in the horizontal direction through the second transmission assembly when the driving shaft (110) rotates, and a thread hooking hole (411) provided on the thread hooking member (410). ​ ​ ​ The bending needle mechanism comprises a bending needle (310) and a third transmission assembly, the bending needle (310) has a threading channel (311) extending along its length direction, the bending needle (310) is connected to the driving shaft (110) through the third transmission assembly, the driving shaft (110) can drive the bending needle (310) to approach or move away from the wire poking hook (410) through the third transmission assembly, the third transmission assembly comprises a transmission wheel (321), a first connecting rod (322), a second connecting rod (323) and a transmission shaft (324), the transmission wheel (321) is connected to the driving shaft (110), one end of the first connecting rod (322) is rotatably connected to the transmission wheel (321), the other end of the first connecting rod (322) is rotatably connected to one end of the second connecting rod (323), the transmission shaft (324) is rotatably connected to the outside of the box body (100), the bending needle (310) is arranged on the transmission shaft (324), one end of the transmission shaft (324) extends into the box body (100) and is connected to the other end of the second connecting rod (323), the rotation axes of the first connecting rod (322), the second connecting rod (323) and the transmission shaft (324) all extend along the left-right direction.

2. A transmission housing as claimed in claim 1, characterised in that: The part of the transmission shaft (324) outside the box body (100) is connected with a transmission seat (325), and the bending needle (310) is detachably connected to the transmission seat (325).

3. A transmission housing as claimed in claim 1, characterised in that: The second transmission assembly comprises a wire poking shaft (421), a second eccentric wheel, a wire poking guide rod (422), a wire poking transmission member (423) and a wire poking block (424), the wire poking shaft (421) is rotatably connected in the box body (100), the rotation axis of the wire poking shaft (421) extends along the up-down direction, the wire poking shaft (421) and the driving shaft (110) are connected through gears, the second eccentric wheel is eccentrically connected to the wire poking shaft (421), one end of the wire poking transmission member (423) is sleeved outside the second eccentric wheel through a second bearing, the wire poking block (424) is rotatably connected to the other end of the wire poking transmission member (423), the rotation axis of the wire poking block (424) extends along the up-down direction, the wire poking guide rod (422) is slidably connected to the outside of the box body (100), the wire poking hook (410) is arranged on the wire poking guide rod (422), one end of the wire poking guide rod (422) extends into the box body (100) and is connected to the wire poking block (424).

4. A transmission housing as claimed in claim 3, characterised in that: The part of the wire poking guide rod (422) outside the box body (100) is connected with a wire poking seat (430), the wire poking seat (430) is detachably connected with a wire poking sheet (440), and the wire poking hook (410) is connected to the wire poking sheet (440).

5. A transmission housing as claimed in claim 3, characterised in that: The wire poking block (424) is connected with not less than two wire poking guide rods (422).

6. A transmission housing as claimed in claim 1, characterised in that: The lead frame (210) comprises a front lead segment, a transition segment and a rear lead segment, the front lead segment and the rear lead segment are spaced apart and connected to the transition segment in the front-rear direction, one end of the front lead segment is connected to the box body (100), the front lead segment and the rear lead segment are both provided with the lead hole (211), and the thread lifting rod (220) is located between the front lead segment and the rear lead segment.

7. A gearbox according to any one of claims 1 to 6, characterised in that: The curved needle (310), the thread hook (410), the lead hole (211) and the thread lifting hole (221) are all arranged in multiple in the left-right direction.

8. A gearbox according to any one of claims 1 to 6, characterised in that: The box body (100) is connected with a lead plate (500), the lead plate (500) is provided with a transition hole (510), and the lead plate (500) is located between the curved needle (310) and the lead frame (210).

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