Straight knife type thread trimming mechanism and template machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a straight knife type thread trimming mechanism and a template machine. The straight knife type thread trimming mechanism comprises a machine shell, a first movable knife mechanism and a second movable knife mechanism; the first movable cutter is rotatably arranged on the machine shell by taking the rotating shuttle shaft as the center; the first trimming motor is fixed to the machine shell and used for driving the first movable cutter. The first movable cutter is used for driving the sewing thread to the second movable cutter mechanism; the second movable cutter mechanism is used for being matched with the first movable cutter mechanism to cut off the sewing thread and comprises a second thread cutting motor, a second movable cutter and a guide assembly; the second trimming motor drives the guide assembly to move in the set direction through the crank assembly. The second moving cutter is installed on the guide assembly and has a first position and a second position in the set direction. The first position is closer to the first moving cutter than the second position; when in the first position, the cutting edge of the second movable cutter is matched with the cutting edge of the first movable cutter to execute thread trimming action; at the second position, the cutting edge is separated from the first movable cutter, so that the thread trimming action is efficient and reliable, and maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewing machines, and particularly relates to a straight knife type thread cutting mechanism and a template machine. BACKGROUND

[0002] A sewing machine is a machine that forms one or more stitches on a workpiece by sewing thread, interweaves or sews together one or more workpieces, and generally comprises a base (i.e., a machine shell and a bottom plate), a needle bar mechanism, a feeding mechanism, a thread hooking mechanism, a presser foot mechanism, a thread cutting mechanism, and an accessory part, which work in cooperation.

[0003] For example, Chinese patent CN105734851A discloses a thread cutting device of a sewing machine, which comprises a lower cutting knife unit, an upper cutting knife unit, and a driving unit. The driving unit is hingedly connected to the upper cutting knife unit and the lower cutting knife unit, respectively, and drives the thread cutting edges of the upper cutting knife and the lower cutting knife to overlap at a position close to the center of the needle to cut the thread. This structure is a common thread cutting structure of a template machine, which leaves long thread ends on the surface of the cloth. During the start and end stages of sewing, long thread ends are left on the surface of the cloth after cutting, and the thread ends formed during the needle lifting process are prone to accumulate in a bird's nest shape due to uneven tension. Such irregular thread ends not only damage the neatness of the appearance of the clothes and reduce the product quality standard, but also need to be trimmed manually for remediation, thereby increasing labor costs.

[0004] To further optimize thread cutting, Chinese patent CN202210095960.5 discloses a three-dimensional sewing template machine capable of automatically cutting thread. The automatic thread cutting device is configured to cut the thread ends of the sewing thread. The automatic thread cutting device of this technical solution needs to be configured with two rotary cutting pieces, which are opened or closed around the hinge point and perform the thread cutting action. The structure is similar to that of a scissors. The movement trajectory of the two rotary cutting pieces needs to reserve a large operation space, which may limit the compactness of the internal layout of the template machine, especially in the multi-head collaborative working scenario, which is prone to interfere with other functional modules (such as the presser foot and the cloth feeding mechanism). SUMMARY

[0005] The purpose of the present application is to provide a straight knife type thread cutting mechanism and a template machine, which can effectively cut the thread during the sewing process, and has a compact structure to avoid interference with other modules.

[0006] The purpose of the present application is achieved as follows:

[0007] A straight knife type thread cutting mechanism, comprising a machine shell,

[0008] The first moving knife mechanism comprises a first thread cutting motor and a first moving knife; the first moving knife is rotatably arranged in the shell with a rotating hook shaft as the center; the first thread cutting motor is fixed on the shell and used to drive the first moving knife; the first moving knife is used to guide the sewing thread to the second moving knife mechanism;

[0009] The second moving knife mechanism is used to cut the sewing thread in cooperation with the first moving knife mechanism;

[0010] The second moving knife mechanism comprises a second thread cutting motor, a second moving knife and a guide assembly;

[0011] The second thread cutting motor drives the guide assembly to move along a set direction through a crank assembly;

[0012] The second moving knife is installed on the guide assembly and has a first position and a second position in the set direction; the first position is closer to the first moving knife than the second position; when the second moving knife is in the first position, the blade of the second moving knife cooperates with the blade of the first moving knife to perform the thread cutting action; when the second moving knife is in the second position, the blade of the second moving knife is separated from the first moving knife.

[0013] According to the above technical scheme, when the straight knife type thread cutting mechanism is in normal use, the first thread cutting motor drives the first moving knife to rotate around the rotating hook shaft to guide the sewing thread to the direction of the second moving knife mechanism; at this time, the second thread cutting motor drives the guide assembly to move along a set direction through a crank assembly, so that the second moving knife installed thereon can reciprocate between the second position and the first position; when the second moving knife needs to cut the thread in the starting stage and the ending stage, the second moving knife moves from the second position to the first position, slides along the surface of the first moving knife and the blade position intersects with the blade position of the first moving knife, and the two form a shearing cooperation to realize the accurate cutting of the sewing thread; after the thread cutting is completed, the second moving knife retreats to the second position with the guide assembly, and the blade is completely separated from the working range of the first moving knife to avoid interfering with the normal thread running of the sewing machine; the relative movement mode of the first moving knife and the second moving knife rotating around the shaft simplifies the movement track, does not need to occupy the transverse or longitudinal expansion space of the internal layout of the template machine, reduces the arc space redundancy required by the shearing part, and is compactly arranged.

[0014] Preferably, the first moving knife is provided with a thread hole groove, a first thread hooking groove and a second thread hooking groove located on the opposite sides of the first moving knife along the width; the thread hole groove is used for the needle to pass through and hook the sewing thread in the starting stage; the first thread hooking groove and the second thread hooking groove are used to hook the sewing thread in the ending stage, so that the sewing thread is in the blade position of the first moving knife.

[0015] By the technical scheme, in the starting stage, the first moving cutter rotates until the thread hole groove is aligned directly below the needle position, the needle first passes through the thread hole groove downward, then leaves the thread hole groove upward and is lifted to a suitable position above the machine shell, and the first needle-down needle action of the needle is completed; the thread tensioner of the sewing machine upwardly tensions the thread and drives the thread on the needle to retreat; the sewing thread on the needle remains in the thread hole groove, and the first moving cutter brings the sewing thread to the second moving cutter mechanism and shears the thread end in the starting stage.

[0016] When the sewing is completed, in the ending stage, the first moving cutter rotates in the first direction to pass through the thread loop, retreats in the second direction to make the thread segments of the thread be hooked by the thread hooking groove one and the thread hooking groove two, and is pulled to the second moving cutter mechanism and shears the thread end in the ending stage.

[0017] Preferably, the guide assembly comprises a sliding groove and a sliding block;

[0018] The sliding groove is arranged on the machine shell;

[0019] The sliding block is installed in the sliding groove, and a clamping groove is arranged in the middle of the sliding block;

[0020] The second moving cutter is installed on the sliding block;

[0021] The crank assembly is rotationally installed on the machine shell, one end of the crank assembly is arranged in the clamping groove and drives the sliding block, and the other end of the crank assembly is connected with the second thread shearing motor.

[0022] By the technical scheme, the cooperation of the sliding groove and the sliding block in the guide assembly provides linear guide constraint by fixing the sliding groove to the machine shell, the sliding block is embedded in the sliding groove and reciprocally slides along the length direction of the sliding groove, the clamping groove in the middle of the sliding block and the movable end of the crank assembly form hinged cooperation, and the rotational movement of the crank assembly is converted into the linear movement of the sliding block; in the operation process, the second thread shearing motor drives the crank assembly to make the end of the crank assembly slide in the clamping groove and push the sliding block to move along the sliding groove, so as to drive the second moving cutter fixed to the sliding block to perform linear shearing action; the structure reduces the risk of movement deviation by high-precision guide of the sliding groove and the sliding block, realizes the stability of power transmission by hinged design of the crank and the clamping groove, and further optimizes assembly efficiency and maintenance convenience by modular layout.

[0023] Preferably, the crank assembly comprises a rotating block connected to the driving shaft of the second thread shearing motor, a connecting rod and a crank rod;

[0024] The two ends of the connecting rod are hingedly connected to the rotating block and the crank rod respectively, the crank rod is hingedly connected to the machine shell, the crank rod has a movable block, and the movable block is embedded in the clamping groove;

[0025] When the second cutting motor driving rotating block rotates, it drives the connecting rod to swing to rotate the crank rod, so that the movable block drives the slider to move along the sliding groove in the clamping groove.

[0026] Through the above technical scheme, the second cutting motor drives the rotating block to rotate through the driving shaft, a double-degree-of-freedom connecting rod mechanism is formed based on the fact that the two ends of the connecting rod are respectively hinged to the rotating block and the crank rod, the crank rod is hinged to the housing to form fixed-axis rotation, the circular motion of the rotating block is converted into fixed-axis swing of the crank rod, the end of the crank rod is embedded into the sliding block clamping groove by the movable block to form a sliding combination, and the sliding combination slides along the clamping groove track to push the slider to move linearly in the sliding groove, so as to complete the cutting action of driving the second moving knife. Through the composite transmission of the multi-stage hinging and sliding pair, the inertia impact when the motor directly drives the slider is reduced, the driving torque is amplified by the lever effect of the multi-rod setting, the response speed of the cutting action is improved, and the cutting action is more stable.

[0027] Preferably, one side of the guide assembly is provided with a thread clamping piece, and the thread clamping piece is fixed on the housing; when the first moving knife rotates to the side of the second moving knife to a set position, the thread clamping piece passes through the thread hole on the first moving knife and abuts against the lower side of the first moving knife.

[0028] Through the above technical scheme, in the sewing stage, when the first moving knife drives the sewing thread to approach the second moving knife, the thread clamping piece presses the sewing thread head passing through the thread hole groove and abuts against the lower side wall of the first moving knife to position, so as to avoid the cutting deviation caused by the sliding of the wire, improve the flatness of the thread cutting, reduce the tool wear caused by the vibration of the sewing thread, and optimize the reliability of the cutting action.

[0029] Preferably, one side of the guide assembly is provided with an air suction device; and the air suction port of the air suction device faces the first moving knife.

[0030] Through the above technical scheme, the air suction port of the air suction device faces the first moving knife cutting area, and when the first moving knife and the second moving knife complete the wire cutting, the air suction device is started immediately, the cut thread head is sucked into the internal passage of the air suction port through the negative pressure airflow, and is directly discharged or collected, so as to quickly remove the residual thread head, avoid the accumulation of the thread head on the surface of the moving knife or in the sliding groove to cause jamming or blockage, reduce the frequency of manual cleaning, and improve the self-cleaning ability and long-term operation reliability of the equipment.

[0031] Preferably, the first thread cutting motor drives the first moving knife to move circumferentially around the rotating hook shaft through a transmission structure, and the transmission structure comprises a transmission assembly one, a main shaft rotatably arranged on the housing, and a transmission assembly two.

[0032] The transmission assembly includes a transmission rod 1 connected to the drive shaft of the first wire shearing motor and a transmission rod 2 disposed on the main shaft. The transmission rod 2 has a guide groove on its end face near the transmission rod 1. The transmission rod 1 is rotatably provided with a guide block. The guide block is embedded in the guide groove to allow the transmission rod 2 to move and cooperate with the transmission rod 1.

[0033] The transmission assembly 2 includes a first crank, a second crank, and a swing ring. The first crank is connected to the end of the main shaft away from the transmission rod 2. The two ends of the second crank are respectively hinged to the first crank and the first ring. The first moving blade is mounted on the swing ring. The swing ring is rotatably sleeved on the rotary shuttle shaft.

[0034] Through the above technical solution, the first thread-cutting motor drives the output shaft to rotate, and the output shaft drives the transmission rod fixed on it to rotate. When the transmission rod rotates with the motor drive shaft, its end guide block slides along the guide groove on the end face of the transmission rod, converting the rotational motion into the movement of the transmission rod. The transmission rod drives the main shaft to rotate synchronously, so that when the first crank at the other end of the main shaft rotates, the second crank moves to drive the swing ring to rotate around the shuttle shaft, thereby driving the first moving knife fixed on the swing ring to perform the hooking and pulling action of the sewing thread. The whole system realizes the high-stability trajectory control of the first moving knife, optimizes the cutting synchronization and the durability of the mechanism.

[0035] Preferably, a cutter mounting base is installed on the housing, and the cutter mounting base is provided with the slide groove along its length direction; a left baffle and a right baffle are respectively provided on the left and right sides of the cutter mounting base along its length direction, and the left baffle and the right baffle constrain the slider within the slide groove.

[0036] Through the above technical solution, the left baffle and the right baffle are respectively installed on both sides of the slide groove to form a double-sided limiting structure, which restricts the slider from disengaging from the opening of the slide groove and keeps it moving stably along the length of the slide groove.

[0037] A template machine, comprising the aforementioned straight-blade wire-cutting mechanism;

[0038] The bottom of the housing is provided with a rotating connection part, which is used to connect the rotating device;

[0039] A longitudinal rotary hook shaft is located on the rear side of the middle section of the housing.

[0040] A first wire-cutting motor is horizontally arranged on the lower left side of the machine housing, and the first wire-cutting motor is located on the left side of the rotary hook shaft;

[0041] A second wire-cutting motor is vertically arranged on the rear side of the right part of the housing, and the second wire-cutting motor is located on the right side of the rotary hook shaft.

[0042] Through the technical scheme, the bottom of the shell of the straight knife type thread cutting mechanism in the template machine is connected with the external rotating device through the rotating connecting part, the rotating shuttle shaft longitudinally arranged at the rear side of the middle part of the shell provides a support shaft for the first moving knife to swing circumferentially, the first thread cutting motor is horizontally arranged at the lower side of the left part of the shell and drives the first moving knife to rotate around the rotating shuttle shaft through the transmission assembly, and the second thread cutting motor is vertically installed at the rear side of the right part of the shell and drives the second moving knife to move linearly along the sliding groove through the crank assembly; the interference of the power transmission path is reduced, the overall rigidity of the shell is enhanced, the rotating connecting part absorbs the vibration interference of the external rotating device, and the axial bearing of the rotating shuttle shaft to the shearing force significantly improves the synchronization accuracy and stability of the double moving knives during high-speed shearing.

[0043] The technical scheme has the following prominent and beneficial technical effects compared with the prior art:

[0044] 1. The first moving knife mechanism and the second moving knife mechanism cooperate to realize the shortening of the sewing thread, and the shortening effect is good; the second moving knife mechanism adopts a straight knife form, the second moving knife moves along a straight line and approaches the first moving knife, and the shortening of the sewing thread is realized at a set position; the relative movement mode of the two moving knives rotating around the shaft simplifies the movement track, does not need to occupy the transverse or longitudinal expansion space of the internal layout of the template machine, reduces the arc space redundancy required by the shearing part, and is arranged compactly.

[0045] 2. The second moving knife mechanism adopts a straight knife form, the overall structure of the second thread cutting motor transmitting power to the second moving knife is completely independent, the dependence on the existing sewing machine structure is small, mechanical conflicts or control conflicts are not easy to cause, the second thread cutting motor can accurately control the action of the second moving knife, and the shortening of the sewing thread is better realized.

[0046] 3. The technical scheme is designed on the basis of the template machine, but can also be applied to the lockstitch machine or other special sewing machines, and has the characteristics of wide adaptability.

[0047] 4. When the technical scheme is applied to the template machine, the first thread cutting motor is horizontally arranged at the lower side of the left part of the shell, the second thread cutting motor is vertically arranged at the rear side of the right part of the shell, the two motors are located on the two sides of the rotation center, can balance the overall gravity center to a certain extent, reduce the working noise and improve the service life. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 It is a schematic view of the overall structure of the embodiment;

[0049] Figure 2 It is a schematic view of the overall structure of the embodiment; Figure 1 It is another perspective view;

[0050] Figure 3 It is a schematic view of the overall structure of the straight knife type thread cutting mechanism of the embodiment;

[0051] Figure 4 Partial exploded view of the first moving knife mechanism in the straight knife type thread cutting mechanism of the embodiment;

[0052] Figure 5 Overall structure view of the second moving knife mechanism in the straight knife type thread cutting mechanism of the embodiment;

[0053] Figure 6 Partial exploded view of the guide assembly in the straight knife type thread cutting mechanism of the embodiment;

[0054] Figure 7 Partial exploded view of the thread hole groove hooking in the starting stage of the embodiment;

[0055] Figure 8 Running view of the hooking of the thread hole groove one and the thread hole groove two in the ending stage of the embodiment.

[0056] Reference signs: 1, machine housing; 2, first moving knife mechanism; 21, first thread cutting motor; 22, first moving knife; 3, second moving knife mechanism; 31, second thread cutting motor; 32, second moving knife; 33, guide assembly; 331, sliding groove; 332, sliding block; 4, crank assembly; 41, rotating block; 42, connecting rod; 43, crank rod; 5, clamping groove; 6, movable block; 7, thread clamping piece; 8, air suction device; 9, thread hole groove; 10, thread hole groove one; 11, thread hole groove two; 12, transmission assembly one; 121, transmission rod one; 122, transmission rod two; 13, main shaft; 14, transmission assembly two; 141, first crank; 142, second crank; 143, swing ring; 15, guide groove; 16, guide block; 17, cutter mounting seat; 18, left baffle; 19, right baffle; 20, rotating connecting part; 23, rotating hook shaft. DETAILED DESCRIPTION

[0057] The specific embodiments of the technical solution will be further described in detail below with reference to the drawings.

[0058] Embodiment:

[0059] Reference Figure 1 and Figure 3 A straight knife type thread cutting mechanism, comprising a machine housing 1, a first moving knife mechanism 2 and a second moving knife mechanism 3 installed on the machine housing 1, wherein the first moving knife mechanism 2 comprises a first thread cutting motor 21 and a first moving knife 22, the first moving knife 22 is rotatably arranged on the machine housing 1 with a rotating hook shaft 23 as the center, the first thread cutting motor 21 is fixed horizontally on the lower side of the left part of the machine housing 1 and is used to drive the first moving knife 22 to move; the second moving knife mechanism 3 comprises a second moving knife 32 and a second thread cutting motor 31, the second thread cutting motor 31 is fixed vertically on the rear side of the right part of the machine housing 1 and is used to drive the second moving knife 32 to move.

[0060] Referring to Figure 4 , the first cutting motor 21 drives the first moving cutter 22 to rotate around the rotating hook shaft 23 through a transmission structure, which includes a transmission assembly one 12, a main shaft 13 and a transmission assembly two 14. The transmission assembly one 12 includes a transmission rod one 121 and a transmission rod two 122. The transmission rod one 121 is clamped on the drive shaft of the first cutting motor 21 through a bolt-adjustable expansion joint structure. The transmission rod one 121 is movably connected with the transmission rod two 122. Specifically, a guide block 16 is rotatably connected to the side of the transmission rod one 121 close to the transmission rod two 122. The guide block 16 is a square block. A guide groove 15 is formed on the corresponding side of the transmission rod two 122. The groove width and size of the guide groove 15 are matched with the guide block 16. The guide block 16 is embedded in the guide groove 15 and moves along the groove direction. The end of the transmission rod two 122 away from the transmission rod one 121 is clamped on one end of the main shaft 13 through a bolt-adjustable expansion joint structure. The main shaft 13 is installed on the preset position of the machine shell 1 through a bearing sleeve. The main shaft 13 is rotatably arranged relative to the machine shell 1, so that the transmission rod two 122 can drive the main shaft 13 to rotate synchronously, and the motor power is stably transmitted to the main shaft 13.

[0061] The transmission assembly two 14 includes a first crank 141, a second crank 142 and a swing ring 143. One end of the first crank 141 is connected to the other end of the main shaft 13 away from the transmission rod two 122 through a key connection or an integral forming connection. The second crank 142 is arc-shaped. One end of the second crank 142 is hingedly connected to the end of the first crank 141 away from the main shaft 13, and the other end of the second crank 142 is hingedly connected to the swing ring 143. The swing ring 143 is rotatably sleeved on the rotating hook shaft 23, and the first moving cutter 22 is installed on the swing ring 143. The rotation of the main shaft 13 is converted into the circumferential movement of the swing ring 143, so as to ensure the accurate rotation of the first moving cutter 22 around the rotating hook shaft 23.

[0062] Referring to Figure 5 , the second moving cutter mechanism 3 further includes a guide assembly 33. The second cutting motor 31 drives the guide assembly 33 to move in a set direction through the crank assembly 4. The crank assembly 4 includes a rotating block 41, a connecting rod 42 and a crank rod 43. The rotating block 41 is fixed on the drive shaft of the second cutting motor 31 through a bolt-adjustable expansion joint structure. The extending end of the rotating block 41 is hingedly connected with the connecting rod 42. The other end of the connecting rod 42 away from the rotating block 41 is hingedly connected with the crank rod 43. The crank rod 43 is V-shaped, and the middle part thereof is hingedly arranged on the machine shell 1.

[0063] Referring to Figure 6The guiding assembly 33 comprises a sliding groove 331 and a sliding block 332. The sliding groove 331 is arranged on the casing 1, in particular through the cutter mounting seat 17 installed on the casing 1, and the upper end face of the cutter mounting seat 17 is provided with the sliding groove 331 along the length direction. The sliding block 332 is matched with the sliding groove 331, and the sliding block 332 is embedded in the sliding groove 331 and moves along the length direction. The second moving cutter 32 is installed on the sliding block 332. The cutter mounting seat 17 is installed with a left baffle 18 and a right baffle 19. The two baffles are respectively fixed on the left and right sides of the cutter mounting seat 17 along the length direction through bolts, and oppositely extend to the opening of the sliding groove 331 towards the inside, so as to form a shielding effect. The left baffle 18 and the right baffle 19 can cooperate to constrain the sliding block 332 in the sliding groove 331.

[0064] The middle part of the sliding block 332 is provided with a clamping groove 5, and the clamping groove 5 is arranged on the upper end face of the sliding block 332. The crank rod 43 has a movable block 6 matched with the clamping groove 5, which is located at the other end of the crank rod 43 away from the hinged position of the connecting rod 42. The movable block 6 is embedded in the clamping groove 5. When the second thread cutting motor 31 starts, the driving shaft drives the rotating block 41 to rotate, the rotating block 41 drives the crank rod 43 to rotate around the shaft through the connecting rod 42, the movable block 6 slides in the clamping groove 5 and pushes the sliding block 332 to move linearly along the sliding groove 331 of the cutter mounting seat 17. The second moving cutter 32 has a first position and a second position in the set direction, so as to realize the reciprocating switching between the first position and the second position of the second moving cutter 32.

[0065] Referring to Figure 3 , Figure 7 and Figure 8 , one side of the guiding assembly 33 is provided with a thread clamping piece 7, which is fixed on the casing 1. When the first moving cutter 22 rotates to the set position to the side of the second moving cutter 32, the thread clamping piece 7 passes through the thread hole on the first moving cutter 22 and can abut against the lower side of the first moving cutter 22 to press the sewing thread. One side of the guiding assembly 33 is also provided with a suction device 8, and the suction port of the suction device 8 can face the first moving cutter 22.

[0066] The first moving cutter 22 is provided with a thread hole groove 9, a thread hooking groove one 10 and a thread hooking groove two 11. The thread hole groove 9 and the thread hooking groove one 10 are arranged along the rotating direction of the first moving cutter 22. The thread hole groove 9 is located at one end of the first moving cutter 22 close to the blade edge, and is used for the needle to pass through and hook the sewing thread in the starting stage. The thread hooking groove one 10 and the thread hooking groove two 11 are respectively located on the opposite sides of the middle part of the first moving cutter 22, and both have openings outward. The two side openings are used to hook the sewing threads on both sides into the corresponding thread hooking grooves in the ending sewing stage, so as to realize the thread hooking.

[0067] In the starting stage, the first cutting motor 21 drives the first moving knife 22 to rotate around the rotating hook shaft 23, so that the thread hole groove 9 is aligned below the needle, and after the needle passes through the thread hole groove 9 to complete the first needle sewing, the thread is retained in the thread hole groove 9, the first moving knife 22 continues to rotate to guide the sewing thread to the direction of the second moving knife 32, the thread clamp 7 presses the thread head, the needle performs the second needle lowering action, and the thread on the needle is locked with the bottom thread in the rotating hook shaft 23 to tighten the thread, so that the second needle is not lifted to take the thread out of the thread hole groove 9, and the subsequent cut thread is not easy to loosen, until the second needle locking is completed.

[0068] The second cutting motor 31 drives the second moving knife 32 to move through the crank assembly 4 and the guide assembly 33, and drives the second moving knife 32 to move linearly from the second position (away from the first moving knife 22) to the first position (close to the first moving knife 22), so that the blade of the second moving knife 32 slides along the surface of the first moving knife 22 and intersects with the blade of the first moving knife 22 to form a shearing force, accurately cutting the starting thread, after cutting, the second moving knife 32 retreats to the second position to avoid interference with subsequent sewing, the air suction device 8 sucks away the thread head through the air suction port, and the needle continues to sew until the current sewing operation is completed.

[0069] In the finishing stage, the first moving knife 22 rotates in the first direction through the thread loop and then reverses to retreat, and the openings of the two thread hooking grooves on the opposite sides are respectively directed to and hooked into the sewing threads on the two sides to pull the threads to the second moving knife 32, and part of the sewing thread passes below the first moving knife 22, and the second moving knife 32 moves from the second position to the first position again to complete secondary cutting, finish the thread, and the cutting is completed.

[0070] The specific working process of the scheme is as follows:

[0071] The first cutting motor 21 drives the first moving knife 22 to rotate around the rotating hook shaft 23, so that the thread is guided to the direction of the second moving knife mechanism 3; at this time, the second cutting motor 31 drives the guide assembly 33 to move along the set direction through the crank assembly 4, so that the second moving knife 32 installed thereon can reciprocate between the second position and the first position, in the starting stage and the finishing stage, when cutting is needed, the second moving knife 32 moves from the second position to the first position, slides along the surface of the first moving knife 22, and the blade intersects with the blade of the first moving knife 22, and the two form a shearing fit to accurately cut the sewing thread; after cutting, the second moving knife 32 retreats to the second position with the guide assembly 33, and the blade completely leaves the working range of the first moving knife 22 to avoid interfering with the normal sewing of the sewing machine, the relative movement mode of the two moving knives rotating around the shaft simplifies the movement track, does not need to occupy the transverse or longitudinal expansion space of the internal layout of the template machine, reduces the arc space redundancy required by the cutting part, and is arranged compactly.

[0072] A template machine comprises a template machine body, a rotating shuttle shaft 23 and a rotating connecting part 20 are arranged at the bottom of the machine shell 1, which are used for installing the rotating connecting part 20 to the template machine body connecting rotating device, the rotating shuttle shaft 23 is longitudinally arranged at the rear side of the middle part of the machine shell 1, a first thread cutting motor 21 is arranged at the left side of the rotating shuttle shaft 23, and a second thread cutting motor 31 is arranged at the right side of the rotating shuttle shaft 23.

[0073] The basic principle and main features of the technical scheme and the advantages of the technical scheme are shown and described above. It should be understood by those skilled in the art that the technical scheme is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the technical scheme. Without departing from the spirit and scope of the technical scheme, various changes and improvements can be made to the technical scheme, and these changes and improvements all fall within the scope of the claimed technical scheme. The scope of protection of the technical scheme is defined by the appended claims and their equivalents.

Claims

1. A straight blade thread cutting mechanism, comprising: a machine housing (1), a first moving blade mechanism (2) comprising a first thread cutting motor (21) and a first moving blade (22); the first moving blade (22) is rotatably arranged in the machine housing (1) with a rotating shaft as the center; the first thread cutting motor (21) is fixed on the machine housing (1) and used to drive the first moving blade (22); the first moving blade (22) is used to guide the sewing thread to a second moving blade mechanism; a second moving blade mechanism (3) used to cut the sewing thread with the first moving blade mechanism (2); characterized in that, the second moving blade mechanism (3) comprises a second thread cutting motor (31), a second moving blade (32) and a guide assembly (33); the second thread cutting motor (31) drives the guide assembly (33) to move in a set direction through a crank assembly (4); the second moving blade (32) is installed on the guide assembly (33) and has a first position and a second position in the set direction; the first position is closer to the first moving blade (22) than the second position; when the second moving blade (32) is in the first position, the cutting edge of the second moving blade (32) cooperates with the cutting edge of the first moving blade (22) to perform a thread cutting action; when the second moving blade (32) is in the second position, the cutting edge of the second moving blade (32) is separated from the first moving blade (22).

2. A straight blade thread trimming mechanism according to claim 1, wherein the first moving blade (22) is provided with a thread hole slot (9), a first thread hooking groove (10) and a second thread hooking groove (11) located on the opposite sides of the first moving blade (22) along the width; the thread hole slot (9) is used for the needle to pass through and hook the sewing thread in the starting stage; the first thread hooking groove (10) and the second thread hooking groove (11) are used to hook the sewing thread in the ending stage, so that the sewing thread is in the position of the cutting edge of the first moving blade (22).

3. A straight blade thread trimming mechanism according to claim 1, wherein the guide assembly (33) comprises a sliding groove (331) and a sliding block (332); the sliding groove (331) is arranged on the machine housing (1); the sliding block (332) is installed in the sliding groove (331) and is provided with a clamping groove (5) in the middle part of the sliding block (332); the second moving blade (32) is installed on the sliding block (332); the crank assembly (4) is rotatably installed on the machine housing (1), one end of the crank assembly (4) is arranged in the clamping groove (5) and drives the sliding block (332), and the other end of the crank assembly (4) is connected with the second thread cutting motor (31).

4. A straight blade thread trimming mechanism according to claim 3, wherein the crank assembly (4) comprises a rotating block (41) connected with the driving shaft of the second thread cutting motor (31), a connecting rod (42) and a crank rod (43); both ends of the connecting rod (42) are hingedly connected with the rotating block (41) and the crank rod (43) respectively, the crank rod (43) is hingedly connected with the machine housing (1), and the crank rod (43) has a movable block (6) embedded in the clamping groove (5); when the second thread cutting motor (31) drives the rotating block (41) to rotate, the connecting rod (42) swings to rotate the crank rod (43), so that the movable block (6) drives the sliding block (332) to move along the sliding groove (331) in the clamping groove (5).

5. A straight blade thread trimming mechanism according to claim 1 wherein, One side of the guide assembly (33) is provided with a thread clamping piece (7), which is fixed on the machine shell (1); when the first moving cutter (22) rotates to a set position on one side of the second moving cutter (32), the thread clamping piece (7) passes through the thread hole on the first moving cutter (22) and abuts against the lower side of the first moving cutter (22).

6. A straight blade thread trimming mechanism according to claim 1 wherein, One side of the guide assembly (33) is also provided with an air suction device (8); the air suction port of the air suction device (8) faces the first moving cutter (22).

7. A straight blade thread trimming mechanism according to claim 1 wherein, The first thread cutting motor (21) drives the first moving cutter (22) to move circumferentially around the rotating hook shaft through a transmission structure, which includes a transmission assembly one (12), a main shaft (13) rotatably arranged on the machine shell (1), and a transmission assembly two (14); The transmission assembly one (12) includes a transmission rod one (121) connected to the driving shaft of the first thread cutting motor (21) and a transmission rod two (122) arranged on the main shaft (13); the side end face of the transmission rod two (122) close to the transmission rod one (121) is provided with a guide groove (15); the transmission rod one (121) is correspondingly rotatably provided with a guide block (16); the guide block (16) is embedded in the guide groove (15) to make the transmission rod two (122) and the transmission rod one (121) movably cooperate; The transmission assembly two (14) includes a first crank (141), a second crank (142), and a swing ring member (143); the first crank (141) is connected to one end of the main shaft (13) away from the transmission rod two (122); the second crank (142) is hingedly connected at both ends to the first crank (141) and the first ring part; the first moving cutter (22) is installed on the swing ring member (143), and the swing ring member (143) is rotatably sleeved on the rotating hook shaft.

8. A straight blade thread trimming mechanism according to claim 3, wherein A cutter mounting seat (17) is installed on the machine shell (1), and the slide groove (331) is arranged in the length direction of the cutter mounting seat (17); a left baffle (18) and a right baffle (19) are arranged on the left and right sides of the length direction of the cutter mounting seat (17), respectively; the slide block (332) is constrained in the slide groove (331) by the left baffle (18) and the right baffle (19).

9. A template machine characterized by, The straight cutter type thread cutting mechanism of any one of claims 1-8; A rotating coupling part (20) is arranged at the bottom of the machine shell (1), which is used to connect a rotating device; A longitudinal rotating hook shaft (23) is arranged at the rear side of the middle part of the machine shell (1), A first thread cutting motor (21) is horizontally arranged at the lower side of the left part of the machine shell (1), and is located on the left side of the rotating hook shaft (23); A second thread cutting motor (31) is vertically arranged at the rear side of the right part of the machine shell (1), and is located on the right side of the rotating hook shaft (23).

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