CN218203401U - Sewing machine and trimming control mechanism thereof - Google Patents

Abstract

The utility model provides a trimming control mechanism of a sewing machine and the sewing machine, wherein the trimming control mechanism comprises an electric control module, a trimming mechanism and a rotatable rotating shuttle, the trimming mechanism comprises a trimming driving source, a driving knife with a wire dividing knife tip and a driving knife driving component which is in transmission connection between the trimming driving source and the driving knife, and the rotating shuttle is provided with a wire-off point; the thread cutting control mechanism of the sewing machine further comprises a detection assembly, a detection sensor is arranged in the detection assembly and used for detecting the position of a thread separation point when the thread separation point and a thread separation cutter point are circumferentially aligned, and the thread cutting driving source and the detection sensor are in communication connection with the electric control module. In this application, whether automatically controlled module can accurately judge the line separation point and the alignment of separated time knife tip circumference according to the feedback that detects the sensor, only when both align, automatically controlled module just can control the action of trimming driving source after receiving the trimming instruction for the trimming action is more stable, avoids the rotating shuttle to collude the influence of line separation time change, effectively improves the trimming effect.

Description

Sewing machine and trimming control mechanism thereof

Technical Field

The utility model relates to a sewing machine technical field especially relates to a sewing machine cut line control mechanism and contain this sewing machine of cutting line control mechanism.

Background

At present, most flush joint machines in the market are provided with a thread hooking mechanism and a thread cutting mechanism, the thread hooking mechanism comprises a rotatable lower shaft and a rotating shuttle fixed at the left end of the lower shaft, and the thread cutting mechanism comprises a thread cutting driving source, a thread cutting knife assembly and a thread cutting transmission assembly driving the thread cutting knife assembly to be meshed, so that the flush joint machine has an automatic thread cutting function. The thread cutting driving source can be an electromagnet, and thread cutting is carried out by utilizing an electromagnet structure; or the thread trimming driving source can be a stepping motor, and the thread trimming is carried out by utilizing a stepping motor structure.

However, the thread cutting effect of thread cutting by using the stepping motor structure is closely related to the timing sequence of thread cutting. After the hook time of the rotating shuttle is adjusted more, the thread trimming time needs to be readjusted in order to ensure the thread trimming stability. If the thread is cut too early, thread cutting and thread falling are easy to occur; if the thread is cut too late, the situation that a single thread is cut or the thread is cut continuously can occur; in addition, when the upper or lower stop position of the sewing machine is changed, the trimming is affected, and the trimming time needs to be readjusted. Therefore, setting of the trimming timing is particularly important. Once the problem of trimming or the unstable condition of trimming occur, the adjustment often needs to be carried out manually, and the adjustment mode is relatively complicated.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, the to-be-solved technical problem of the present invention is to provide a thread trimming control mechanism for a sewing machine, which effectively improves the thread trimming effect.

In order to achieve the above object, the present invention provides a thread trimming control mechanism for a sewing machine, comprising an electric control module, a thread trimming mechanism and a rotatable rotating shuttle, wherein the thread trimming mechanism comprises a thread trimming driving source, a driving knife with a thread dividing knife tip, and a driving knife driving assembly which is in transmission connection between the thread trimming driving source and the driving knife, and the rotating shuttle has a thread take-off point; the trimming control mechanism of the sewing machine further comprises a detection assembly, a detection sensor is arranged in the detection assembly and used for detecting the position of a wire separating point when the wire separating point and the wire separating tool tip are aligned in the circumferential direction, and the trimming driving source and the detection sensor are connected with the electronic control module in a communication mode.

Furthermore, the shear line control mechanism also comprises a lower shaft which can rotate in the sewing machine, and the rotating shuttle is fixed on the lower shaft through a plurality of fastening screws so that one of the fastening screws is a signal screw; the detection assembly further comprises the signal screw;

when the parting point is aligned with the parting tool nose in the circumferential direction, the detection sensor can detect the position of the signal screw.

Further, the detection sensor is a photoelectric sensor.

Furthermore, the detection sensor is a photoelectric sensor, and reflective paper is fixed on the signal screw.

Furthermore, the detection sensor is a hall sensor, and a magnetic part is fixedly arranged on the signal screw.

Further, the thread cutting control mechanism further comprises a bottom plate and thread separating pieces in the sewing machine, the detection sensor and the thread separating pieces are fixed on the bottom plate through a fastening screw, and the detection sensor is distributed on the outer peripheral side of the rotating shuttle.

Furthermore, the thread cutting control mechanism also comprises a push plate fixedly arranged in the sewing machine, the detection sensor is fixed on the bottom surface of the push plate, and the detection sensor is circumferentially aligned with the thread dividing cutter point; along the axial direction of the rotating shuttle, the detection sensors are aligned with the wire separating tool tips and are distributed on one side of the wire separating points back to the wire separating tool tips.

Furthermore, the detection sensor is a photoelectric sensor, and reflective paper is fixed on the line-off point.

Furthermore, the detection sensor is a hall sensor, and a magnetic part is fixedly arranged on the wire releasing point.

The application also provides a sewing machine, wherein the shearing line control mechanism is configured in the sewing machine.

As described above, the utility model relates to a sewing machine's cut line control mechanism and sewing machine has following beneficial effect:

in this application, whether automatically controlled module can accurately judge the line separation point and the separated time knife tip circumference according to the feedback that detects the sensor and align, only when both align, automatically controlled module just can control the action of trimming driving source after receiving the trimming instruction, orders about the initiative sword and begins to move for initiative sword separated time is stable, just also makes the trimming action more stable, avoids the rotating shuttle to collude the influence of line separation time change, finally effectively improves the trimming effect.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a trimming control mechanism in the present application.

Fig. 2 is an enlarged view of circle a of fig. 1.

Fig. 3 is a schematic structural diagram of a rotary shuttle in an embodiment of a trimming control mechanism.

Fig. 4 is a schematic structural diagram of a main blade driving assembly in an embodiment of the trimming control mechanism.

Fig. 5 is a schematic view illustrating the assembly of the rotary hook and the driving blade in the first embodiment of the trimming control mechanism.

Fig. 6 is a diagram showing a trimming timing control according to a first embodiment of the trimming control mechanism.

Fig. 7 is a schematic structural diagram of a second embodiment of a trimming control mechanism in the present application.

Fig. 8 is a schematic view of the assembly between the detection sensor and the rotating shuttle and the driving knife in the second embodiment of the thread trimming control mechanism.

Fig. 9 is a trimming timing control diagram of a second embodiment of the trimming control mechanism.

Description of the element reference

10. Rotating shuttle

101. Off-line point

102. Rotating shuttle rack

103. Rotating shuttle bed

104. Wire guide plate

105. Rotating shuttle plate

20. Wire cutting driving source

30. Driving knife

31. Branch knife tip

40. Detection sensor

50. Lower shaft

60. Signal screw

70. Branching sheet

80. Push plate

91. Thread trimming cam

92. Thread trimming lever

93. First trimming connecting rod

94. Thread cutting spool

95. First trimming crank

96. Second trimming crank

97. Second trimming connecting rod

98. Movable tool holder

110. Stationary knife

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. In addition, the terms such as "upper", "lower", "left", "right", "middle", etc. used in the present specification are only for convenience of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms should be construed as the scope of the present invention without substantial technical changes.

The application provides a sewing machine and be used for this sewing machine's trimming control mechanism, the model of sewing machine is the flush joint machine. The lockstitch sewing machine has a main shaft, a main motor for driving the main shaft to rotate, a lower shaft 50 parallel to the main shaft, and a shaft transmission assembly drivingly connected between the main shaft and the lower shaft 50. For convenience of description, the axial direction of the main shaft is defined as a left-right direction, and the direction of the main shaft toward the head of the sewing machine is a left direction, and the direction of the main shaft toward the tail of the sewing machine is a right direction.

As shown in fig. 1 and fig. 2, the thread trimming control mechanism of the sewing machine according to the present invention includes an electric control module, a thread trimming mechanism, a rotatable rotating shuttle 10, and a detecting component. The thread cutting mechanism comprises a thread cutting driving source 20, a driving knife 30 with a thread dividing knife tip 31 and a main knife driving component which is in transmission connection between the thread cutting driving source 20 and the driving knife 30. The rotary hook 10 is fixed to the left end of the lower shaft 50 in the sewing machine, and the rotary hook 10 has a thread take-off point 101. The detection assembly comprises a detection sensor 40, and the detection sensor 40 is used for detecting the position of the wire separating point 101 when the wire separating point 101 is circumferentially aligned with the wire separating knife tip 31; namely: when the thread separating point 101 is circumferentially aligned with the thread separating knife edge 31, as shown in fig. 5, the detecting sensor 40 can detect the thread separating point 101 at that time; when the wire separating point 101 is not circumferentially aligned with the wire separating knife edge 31, the wire separating point 101 cannot be detected by the detection sensor 40; in this way, it can be determined whether or not the parting point 101 and the parting blade edge 31 are circumferentially aligned based on the output signal of the detection sensor 40. The circumferential alignment means: as shown in fig. 5, the thread separating point 101 and the thread separating blade edge 31 are circumferentially at the same circumferential angle and are opposed to each other in the axial direction of the rotary hook 10. The trimming driving source 20 and the detection sensor 40 are in communication connection with the electronic control module.

In the above-mentioned thread trimming control mechanism of the sewing machine, the working area of the thread trimming driving source 20 has a thread trimming working area, and when the thread trimming driving source 20 runs from the starting point to the end point of the thread trimming working area, the thread trimming driving source 20 drives the driving knife 30 to move through the main knife driving assembly: firstly, a wire dividing tool nose 31 of the driving tool 30 is inserted into a wire ring to divide wires; next, the active knife 30 moves with the suture thread to cut the suture thread, and automatic thread cutting is performed. The trimming control mechanism comprises a detection assembly, and an electric control module can accurately judge whether the wire separating point 101 is circumferentially aligned with the wire separating tool nose 31 according to the feedback of a detection sensor 40; only when the electronic control module determines that the wire separating point 101 is circumferentially aligned with the wire separating knife tip 31 according to the feedback of the detection sensor 40, the electronic control module controls the wire cutting driving source 20 to operate after receiving a wire cutting instruction, that is, at this time, the wire cutting driving source 20 operates from the starting point to the end point of the wire cutting working area, and the driving knife 30 starts wire separating and automatic wire cutting. Therefore, the active knife 30 is stable in line separation, so that the line cutting action is more stable, the influence of the change of the line hooking and removing time of the rotating shuttle 10 is avoided, the line cutting effect is finally effectively improved, and the stability of the line cutting head is facilitated.

Further, the structure of the rotary hook 10 is: as shown in fig. 3, the rotary hook 10 includes a rotary hook frame 102, a rotary hook bed 103, a thread guide 104 and a rotary hook plate 105, wherein the rotary hook bed 103 is fixed to the lower shaft 50 by a plurality of fastening screws, thereby integrally fixing the rotary hook 10 to the left end of the lower shaft 50; the thread guide plate 104 is installed on the rotary shuttle bed 103, and the thread take-off point 101 of the rotary shuttle 10 is provided on the thread guide plate 104.

Further, in the present application, as shown in fig. 1 and 2, the trimming driving source 20 is a motor, preferably a stepping motor. The thread trimming mechanism can be a double-moving-blade structure, and then the thread trimming mechanism also comprises a rotatable auxiliary moving blade and an auxiliary blade driving component which is connected between the thread trimming driving source 20 and the auxiliary moving blade in a transmission way; when the trimming driving source 20 runs from the starting point to the end point of the trimming working area, the trimming driving source 20 drives the driving blade 30 and the auxiliary blade to move oppositely through the main blade driving assembly and the auxiliary blade driving assembly, respectively. Or, as shown in fig. 1, fig. 2 and fig. 4, the thread trimming mechanism may be a single-blade structure, and then the thread trimming mechanism further includes a fixed knife 110 fixedly disposed, and the fixed knife 110 may be fixed on a bottom plate in the sewing machine; the main cutter driving assembly comprises a trimming cam 91 fixed on a motor shaft of the trimming driving source 20, trimming balls rotatably mounted at the end part of the trimming cam 91, a trimming lever 92 with a fixed rotating fulcrum, a first trimming connecting rod 93, a trimming spool 94 rotatably supported in a bottom plate of the sewing machine and parallel to the lower shaft 50, a first trimming crank 95 fixed at the right end of the trimming spool 94, a second trimming crank 96 fixed at the left end of the trimming spool 94, a second trimming connecting rod 97 and a movable cutter rest 98 capable of rotating around the lower shaft 50, a trimming driving surface capable of being in contact fit with the trimming balls is arranged on the trimming lever 92, two ends of the first trimming connecting rod 93 are respectively hinged with the trimming lever 92 and the first trimming crank 95, two ends of the second trimming connecting rod 97 are respectively hinged with the second trimming crank 96 and the movable cutter rest 98, and the driving cutter 30 is fixed on the movable cutter rest 98. When the thread trimming driving source 20 runs from the starting point to the end point of the thread trimming working area, the thread trimming balls are in contact and matched with the thread trimming driving surface on the thread trimming lever 92 to push the thread trimming lever 92 to rotate, the first thread trimming crank 95, the thread trimming shaft 94 and the second thread trimming crank 96 are driven to rotate through the first thread trimming connecting rod 93, the movable knife rest 98 is driven to rotate through the second thread trimming connecting rod 97, and the driving knife 30 is driven to rotate towards the direction close to the fixed knife 110.

In the above shear line control mechanism, the structure of the detection assembly and the manner of detecting the line-out point 101 may be varied, and two preferred embodiments are provided below.

In the first embodiment, in the rotary hook 10, the thread guiding plate 104 is relatively fixed with respect to the rotary hook base 103, and the positions of the thread take-off points 101 on the thread guiding plate 104 with respect to the fastening screws for fixing the rotary hook base 103 to the lower shaft 50 are also relatively fixed. Based on this, when one of the fastening screws is used as the signal screw 60, the position of the disconnection point 101 on the wire guide plate 104 with respect to the signal screw 60 is determined. The detection assembly further includes the signal screw 60; when the thread separating point 101 is circumferentially aligned with the thread separating blade 31, the detecting sensor 40 can detect the position of the signal screw 60, that is, indirectly detect the position of the thread separating point 101 at that time. The detection sensor 40 is a photoelectric sensor, and reflective paper can be fixed on the signal screw 60 and is matched with the photoelectric sensor to judge the position of the signal screw 60; the position of the signal screw 60 can also be determined by directly using the photoelectric sensor to match with the signal screw 60, i.e. without arranging a reflective paper on the signal screw 60. Or, the detection sensor 40 is a hall sensor, and a magnetic part is fixedly arranged on the signal screw 60 and is matched with the hall sensor to judge the position of the signal screw 60; the signal screw 60 may be provided with a magnetic portion by fixing a magnet thereto, or the signal screw 60 may be magnetized and the signal screw 60 may be provided with a magnetic portion. As shown in fig. 2, the thread cutting control mechanism further includes a thread separating piece 70 in the sewing machine, the detecting sensor 40 and the thread separating piece 70 are fixed to the base plate by a fastening screw, and the detecting sensor 40 is distributed on the outer peripheral side of the rotary hook 10.

As shown in fig. 6, the shear line control mechanism having the first embodiment of the sensing assembly operates as follows.

1. When the thread separation point 101 of the rotary hook 10 moves to be flush with the thread separation blade edge 31 of the active blade 30, a signal generated when the detection sensor 40 detects the signal screw 60 at this time is used as a thread separation start signal.

2. An operator inputs a thread cutting signal to a pedal of the sewing machine, and after receiving a thread cutting instruction, the electric control module firstly judges whether the main shaft is in a lower needle stop position according to the angle of a motor of a main motor; if the main shaft is not located at the lower needle stop position, the electric control module controls the main motor to drive the main shaft to rotate continuously, and the speed of the main shaft is adjusted to the set main shaft thread cutting speed before the main shaft reaches the lower needle stop position until the main shaft reaches the lower needle stop position; and if the main shaft is positioned at the lower needle stop position, the electric control module starts to execute a thread cutting program.

3. The electric control module controls the main motor to drive the main shaft to rotate at a set main shaft line shearing speed, the main shaft drives the lower shaft 50 and the rotating shuttle 10 to rotate through the shaft transmission assembly, and the line releasing point 101 and the signal screw 60 synchronously rotate. Meanwhile, the electronic control module judges whether the current angle δ 0 of the trimming driving source 20 is at the starting point of the trimming working area, namely whether the current angle δ 0 is at the branching starting angle δ 1; if the trimming driving source 20 is located at the starting point angle δ 1 of the trimming working area, the electronic control module controls the trimming driving source 20 to keep the angle δ 1; if the trimming driving source 20 is not located at the starting point angle δ 1 of the trimming working area, the electronic control module controls the trimming driving source 20 to move from the current angle δ 0 to the starting point angle δ 1 of the trimming working area.

4. When the electronic control module determines that the position of the signal screw 60 is detected according to the output of the detection sensor 40 along with the rotation of the rotary shuttle 10, that is, when the thread take-off point 101 of the rotary shuttle 10 moves to a position flush with the thread dividing knife tip 31 on the driving knife 30, the electronic control module controls the thread cutting driving source 20 to move from the starting angle δ 1 to the thread dividing ending angle δ 2, and drives the driving knife 30 to rotate in a direction close to the fixed knife 110. When the main shaft reaches the branching end angle θ, the thread cutting drive source 20 reaches the branching end angle δ 2 at the same time, and at this time, the blade edge of the fixed blade 110 just starts to cover the movable blade groove on the driving blade 30.

5. The main shaft continues to rotate until reaching the upper needle stopping position; when the thread cutting driving source 20 continues to rotate at a constant speed ω to the end angle δ 3 of the thread cutting work area, the driving knife 30 and the stationary knife 110 are positioned at the maximum engagement amount, and the thread is cut.

6. Finally, the trimming drive source 20 is reversed from the end angle δ 3 of the trimming working area to the current angle before trimming, and the trimming mechanism is reset. Thus, a thread trimming operation is completed.

Example II,

As shown in fig. 7 and 8, the thread trimmer control mechanism further comprises a push plate 80 fixedly arranged in the sewing machine, the push plate 80 is detachably mounted at the left end of the base plate, the detection sensor 40 is fixed on the bottom surface of the push plate 80, the two can be integrated, and the detection sensor 40 is circumferentially aligned with the thread dividing knife tip 31; the detection sensor 40 is aligned with the thread separation blade edge 31 along the axial direction of the rotary hook 10, and the detection sensor 40 is distributed on the left side of the thread separation point 101 opposite to the thread separation blade edge 31. The detection sensor 40 is a photoelectric sensor, and a reflective paper is fixed on the off-line point 101. Alternatively, if the detection sensor 40 is a hall sensor, the magnetic part is fixed to the off-line point 101.

As shown in fig. 9, the shear line control mechanism having the second embodiment of the detection assembly operates as follows.

1. An operator inputs a thread cutting signal to a pedal of the sewing machine, and after receiving a thread cutting instruction, the electric control module firstly judges whether the main shaft is at a lower needle stop position according to the angle of a motor of a main motor; if the main shaft is not located at the lower needle stop position, the electric control module controls the main motor to drive the main shaft to rotate continuously, and the speed of the main shaft is adjusted to the set main shaft thread cutting speed before the main shaft reaches the lower needle stop position until the main shaft reaches the lower needle stop position; and if the main shaft is positioned at the lower needle stop position, the electric control module starts to execute a thread trimming program.

2. The electric control module controls the main motor to drive the main shaft to rotate at a set main shaft wire cutting speed, the main shaft drives the lower shaft 50 and the rotating shuttle 10 to rotate through the shaft transmission assembly, and the wire releasing point 101 synchronously rotates. Meanwhile, the electronic control module judges whether the current angle delta 0 of the trimming driving source 20 is at the starting point of the trimming working area, namely whether the current angle delta 0 is at the branching starting angle delta 1; if the trimming driving source 20 is located at the starting point angle δ 1 of the trimming working area, the electronic control module controls the trimming driving source 20 to keep the angle δ 1; if the trimming driving source 20 is not located at the starting point angle δ 1 of the trimming working area, the electronic control module controls the trimming driving source 20 to move from the current angle to the starting point angle δ 1 of the trimming working area.

3. When the electronic control module determines that the thread separating point 101 of the rotary shuttle 10 is detected according to the output of the detection sensor 40 along with the rotation of the rotary shuttle 10, that is, when the thread separating point 101 of the rotary shuttle 10 moves to a position flush with the thread separating knife tip 31 on the driving knife 30, the electronic control module controls the thread cutting driving source 20 to move from the starting angle δ 1 to the thread separating end angle δ 2, and drives the driving knife 30 to rotate in a direction close to the fixed knife 110. When the main shaft reaches the branching end angle θ, the thread cutting drive source 20 reaches the branching end angle δ 2 at the same time, and at this time, the blade edge of the fixed blade 110 just starts to cover the movable blade groove on the driving blade 30.

4. The main shaft continues to rotate until reaching the upper needle stopping position; when the thread cutting driving source 20 continues to rotate at a constant speed ω to the end angle δ 3 of the thread cutting work area, the driving knife 30 and the stationary knife 110 are positioned at the maximum engagement amount, and the thread is cut.

5. Finally, the trimming drive source 20 is reversed from the end angle δ 3 of the trimming working area to the current angle before trimming, and the trimming mechanism is reset. Thus, a trimming operation is completed.

To sum up, the utility model discloses following beneficial effect has:

1. the position of the wire separating point 101 when the wire separating point 101 is circumferentially aligned with the wire separating tool nose 31 can be detected, namely the wire separating time can be detected, so that the wire separating is more stable, the wire shearing action is more stable, and the stability of the wire shearing head is facilitated; 2. the detection branching technology is combined with the stepping thread cutting technology, so that the thread cutting action is more intelligently controlled, and the thread cutting effect is better; 3. the thread cutting effect and the stability are not influenced by the change of the upper and lower needle stopping positions; 4. the stepping thread cutting is not influenced by the change of the thread hooking (thread releasing) time of the rotating shuttle 10, and the thread cutting stability is better; 5. the adaptability is strong, the parameter of the stepping trimming time sequence is not required to be adjusted, and the influence on the trimming effect caused by artificial adjustment errors is reduced; 6. the control difficulty of the stepping motor by electric control is reduced, so that the wire shearing function is more stable.

To sum up, the utility model discloses various shortcomings in the prior art have effectively been overcome and high industry value has.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a trimming control mechanism of sewing machine, includes electronic control module, trimming mechanism and rotatable rotating shuttle (10), trimming mechanism includes trimming driving source (20), initiative sword (30) that have separated time knife tip (31) and the transmission is connected the main sword drive assembly between trimming driving source (20) and initiative sword (30), rotating shuttle (10) have the point of separating the line (101), its characterized in that: still include detection element, detection sensor (40) have among the detection element, detection sensor (40) are used for detecting the position of taking off line point (101) when taking off line point (101) and separated time knife tip (31) circumference and aligning, trimming driving source (20) and detection sensor (40) all are connected with the electronic control module communication.

2. The thread trimming control mechanism of claim 1, wherein: the rotary hook is characterized by further comprising a lower shaft (50) which can rotate in the sewing machine, wherein the rotary hook (10) is fixed on the lower shaft (50) through a plurality of fastening screws, and one of the fastening screws is a signal screw (60); the detection assembly further comprises the signal screw (60);

when the wire separating point (101) is circumferentially aligned with the wire separating knife tip (31), the detection sensor (40) can detect the position of the signal screw (60).

3. The thread trimming control mechanism according to claim 2, wherein: the detection sensor (40) is a photoelectric sensor.

4. The thread trimming control mechanism according to claim 2, wherein: the detection sensor (40) is a photoelectric sensor, and reflective paper is fixed on the signal screw (60).

5. The thread trimming control mechanism according to claim 2, wherein: the detection sensor (40) is a Hall sensor, and a magnetic part is fixedly arranged on the signal screw (60).

6. The thread trimming control mechanism according to any one of claims 2 to 5, wherein: the sewing machine further comprises a bottom plate and a thread separation piece (70) in the sewing machine, the detection sensor (40) and the thread separation piece (70) are fixed on the bottom plate through a fastening screw, and the detection sensor (40) is distributed on the outer peripheral side of the rotating shuttle (10).

7. The thread trimming control mechanism according to claim 1, wherein: the sewing machine is characterized by further comprising a push plate (80) fixedly arranged in the sewing machine, the detection sensor (40) is fixed on the bottom surface of the push plate (80), and the detection sensor (40) is circumferentially aligned with the thread dividing knife tip (31); along the axial direction of the rotating shuttle (10), the detection sensors (40) are aligned with the parting knife edge (31), and the detection sensors (40) are distributed on one side of the parting point (101) opposite to the parting knife edge (31).

8. The shear line control mechanism of claim 7, wherein: the detection sensor (40) is a photoelectric sensor, and reflective paper is fixed on the wire-off point (101).

9. The shear line control mechanism of claim 7, wherein: the detection sensor (40) is a Hall sensor, and a magnetic part is fixedly arranged on the wire releasing point (101).

10. A sewing machine characterized in that: the sewing machine is provided with the thread trimming control mechanism according to any one of claims 1 to 9.

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