Upper thread breakage detection device for sewing machine

Abstract

The utility model discloses a surface thread breakage detection device for a sewing machine, relates to the technical field of sewing machines, and comprises a detection component and a reminder component; the detection component comprises a mounting plate, a PLC controller is arranged in the middle of one side of the mounting plate, and a reflective infrared sensor is arranged at the bottom of the PLC controller; the reminder component comprises a support tube, the support tube is arranged at the top of one side of the mounting plate, an internally threaded rectangular tube is slidably arranged inside the support tube, and a connecting block is arranged at the top of the internally threaded rectangular tube; the beneficial effect of the utility model is that the surface thread inside the threading hook is monitored in real time by the arranged reflective infrared sensor, when the PLC controller detects that the surface thread inside the threading hook is broken by the reflective infrared sensor, the PLC controller controls the sound and light alarm to work, and the sound and light alarm simultaneously emits a sound alarm and a light alarm, thereby solving the technical problem that it is not convenient to remind the staff of the broken thread by vision and hearing at the same time.

Description

Technical Field

[0001] The utility model relates to an upper thread breakage detection device, in particular to an upper thread breakage detection device for a sewing machine, belonging to the technical field of sewing machines. Background Art

[0002] During the sewing process, the needle and the shuttle in the sewing machine cooperate with each other to interweave the upper thread and the lower thread and sew them on the fabric to form a lock stitch, sewing two or more layers of sewing materials together, the upper thread is inserted into the needle eye of the machine needle, and the lower thread is wound around the shuttle shell in the shuttle. However, the upper thread of the lockstitch sewing machine often breaks during the sewing process, and it is easy for the operator to continue to sew without noticing the upper thread breaking, which will significantly affect the efficiency of the sewing work and also leave more empty needle holes on the sewing material. In order to be able to detect the upper thread status in real time and accurately determine whether the upper thread is broken, an upper thread breakage detection device is installed in the existing sewing machine.

[0003] Among them, an automatic thread breakage detection device for a bag sewing machine with application number "CN201720452316.3" includes a frame, an upper thread, a lower thread, a cylinder, a wire tube, a thread breakage sensor, a tension regulator, a lead component, a PLC controller and a buzzer. The lower thread and the upper thread are respectively wound on the cylinder, and the cylinder is arranged above the frame. There are two thread breakage sensors, which are arranged in parallel and opposite directions on the frame. A porcelain ring is provided at one end of the thread breakage sensor. The wire tube is arranged on the upper left and lower left sides of the thread breakage sensor. There are two tension regulators, which are respectively arranged below the wire tube and on the right side of the thread breakage sensor. A lead component is arranged below the tension regulator. The thread breakage sensor is electrically connected to the PLC controller and the buzzer. The utility model adopts the thread breakage sensor and the PLC controller to detect the thread breakage in time and issue an alarm, so as to achieve the beneficial effects of simple structure, sensitive detection and high efficiency of the automatic thread breakage detection device for the bag sewing machine.

[0004] However, the above-mentioned type of thread breakage detection device still has certain shortcomings when in use. Since there are often multiple sewing machines in a processing plant at the same time, when multiple sewing machines are working at the same time, a lot of noise will be generated. It is not easy for the staff to detect the thread breakage by relying solely on the buzzer, and it is not convenient to better remind the staff of the thread breakage through vision and hearing at the same time. Utility Model Content

[0005] The utility model aims to provide a device for detecting upper thread breakage of a sewing machine, so as to solve the problem in the above-mentioned background technology that it is not convenient to remind the staff of thread breakage by vision and hearing at the same time.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a surface thread breakage detection device for a sewing machine, comprising a detection component and a reminder component; the detection component comprises a mounting plate, a PLC controller is provided in the middle of one side of the mounting plate, and a reflective infrared sensor is provided at the bottom of the PLC controller; the reminder component comprises a support tube, the support tube is arranged at the top of one side of the mounting plate, an internally threaded rectangular tube is slidably provided inside the support tube, a connecting block is provided at the top of the internally threaded rectangular tube, and an audible and visual alarm is provided on one side of the connecting block, and the reflective infrared sensor and the audible and visual alarm are both electrically connected to the PLC controller.

[0007] As a preferred technical solution of the utility model, a U-shaped frame is provided at the bottom of one side of the mounting plate, and a rotating shaft is rotatably inserted through one side of the U-shaped frame via a bearing.

[0008] As a preferred technical solution of the utility model, a mounting block is sleeved on the middle part of the rotating shaft, and the reflective infrared sensor is arranged on one side of the mounting block.

[0009] As a preferred technical solution of the utility model, a forward and reverse servo motor is provided on the side of the U-shaped frame, and the output shaft of the forward and reverse servo motor is connected to a worm.

[0010] As a preferred technical solution of the utility model, one end of the rotating shaft is sleeved with a worm wheel meshingly connected to the worm, and screws are slidably inserted into the four corners of the mounting plate.

[0011] As a preferred technical solution of the utility model, a horizontal plate is provided at the bottom of the inner wall of the support tube, a screw is inserted and rotatably inserted in the middle of the horizontal plate through a bearing, and the top thread of the screw is inserted into the interior of the internally threaded rectangular tube.

[0012] As a preferred technical solution of the utility model, a forward and reverse motor is provided at the bottom end of the inner wall of the support tube, and the output shaft of the forward and reverse motor is connected to the bottom end of the screw.

[0013] Compared with the related art, the upper thread breakage detection device for a sewing machine provided by the utility model has the following beneficial effects:

[0014] The reflective infrared sensor is set up to monitor the upper thread inside the threading hook in real time. When the PLC controller detects that the upper thread inside the threading hook is broken through the reflective infrared sensor, the PLC controller automatically controls the sound and light alarm to start working. The sound and light alarm emits sound alarm and light alarm at the same time, which solves the technical problem of being unable to better remind the staff of broken thread through vision and hearing at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure at point A;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 4 For this utility model Figure 3 Schematic diagram of the enlarged structure at B.

[0019] In the figure: 1. Detection component; 101. Mounting plate; 102. PLC controller; 103. Reflective infrared sensor; 104. U-shaped frame; 105. Rotating shaft; 106. Mounting block; 107. Forward and reverse servo motor; 108. Worm; 109. Worm wheel; 1010. Screw; 2. Reminder component; 201. Support tube; 202. Internally threaded rectangular tube; 203. Connecting block; 204. Sound and light alarm; 205. Cross plate; 206. Screw; 207. Forward and reverse motor. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1:

[0022] See also Figure 1-4 , the utility model provides a upper thread breakage detection device for a sewing machine, comprising a detection component 1 and a reminder component 2;

[0023] The detection assembly 1 includes a mounting plate 101, a PLC controller 102 is fixedly arranged in the middle of one side of the mounting plate 101, and a reflective infrared sensor 103 is arranged at the bottom of the PLC controller 102 to facilitate monitoring of disconnection;

[0024] A U-shaped frame 104 is fixedly provided at the bottom of one side of the mounting plate 101, and a rotating shaft 105 is rotatably inserted through one side of the U-shaped frame 104 via a bearing, so as to facilitate the rotation adjustment of the mounting block 106;

[0025] A mounting block 106 is fixedly sleeved in the middle of the rotating shaft 105, and a reflective infrared sensor 103 is fixedly arranged on one side of the mounting block 106, so as to facilitate real-time monitoring of the disconnection situation;

[0026] A forward and reverse servo motor 107 is fixedly provided on the side of the U-shaped frame 104, and a worm 108 is fixedly connected to the output shaft of the forward and reverse servo motor 107 to drive the worm wheel 109 to rotate;

[0027] A worm wheel 109 meshing with the worm 108 is fixedly sleeved at one end of the rotating shaft 105, and screws 1010 are slidably inserted through the four corners of the mounting plate 101 to facilitate fixing the mounting plate 101 at the corresponding working position;

[0028] Specifically, first, the surface thread inside the threading hook is monitored in real time through the reflective infrared sensor 103. When the PLC controller 102 detects that the surface thread inside the threading hook is broken through the reflective infrared sensor 103, the PLC controller 102 automatically controls the sound and light alarm 204 to start working. The sound and light alarm 204 emits sound alarms and light alarms at the same time, thereby solving the technical problem of being unable to better remind the staff of broken thread through vision and hearing at the same time.

[0029] Embodiment 2:

[0030] The reminder component 2 includes a support tube 201, which is fixedly arranged on the top of one side of the mounting plate 101, and an internally threaded rectangular tube 202 is slidably arranged inside the support tube 201, and a connecting block 203 is fixedly arranged on the top of the internally threaded rectangular tube 202, and a sound and light alarm 204 is fixedly arranged on one side of the connecting block 203, and the reflective infrared sensor 103 and the sound and light alarm 204 are both electrically connected to the PLC controller 102, so as to provide an automatic alarm reminder function for disconnection;

[0031] A horizontal plate 205 is fixedly provided at the bottom of the inner wall of the support cylinder 201, and a screw 206 is rotatably inserted through the middle of the horizontal plate 205 through a bearing. The top thread of the screw 206 is inserted into the inner threaded rectangular cylinder 202, so as to drive the inner threaded rectangular cylinder 202 to slide up and down.

[0032] A forward and reverse motor 207 is fixedly provided at the bottom end of the inner wall of the support cylinder 201, and the output shaft of the forward and reverse motor 207 is fixedly connected to the bottom end of the screw rod 206 to drive the screw rod 206 to rotate;

[0033] Specifically, first, the output shaft of the forward and reverse motor 207 is controlled to rotate to drive the screw 206 to rotate. The rotation of the screw 206 drives the internally threaded rectangular tube 202 to slide up and down inside the support tube 201 through the threaded cooperation with the internally threaded rectangular tube 202. The internally threaded rectangular tube 202 moves up and down through the connecting block 203 to drive the sound and light alarm 204 to adjust the height to prevent it from being blocked by surrounding objects and to be easier to be discovered by staff.

[0034] When in use, first place the upper thread breakage detection device for the sewing machine at the corresponding working position, then check whether all parts of the upper thread breakage detection device for the sewing machine are working properly, and it can be used after the inspection is completed. When in use, the mounting plate 101 is fixedly mounted on the corresponding working position by four screws 1010, and the upper thread inside the threading hook is monitored in real time by the provided reflective infrared sensor 103. When the PLC controller 102 detects that the upper thread inside the threading hook is broken by the reflective infrared sensor 103, the PLC controller 102 automatically controls the sound and light alarm 204 to start working, and the sound and light alarm 204 emits sound alarm and light alarm at the same time when working, so as to solve the technical problem that it is not convenient to remind the staff of the broken thread by vision and hearing at the same time.

[0035] The output shaft of the forward and reverse motor 207 is controlled to rotate, driving the screw 206 to rotate. The rotation of the screw 206 drives the internally threaded rectangular tube 202 to slide up and down inside the support tube 201 through the threaded cooperation with the internally threaded rectangular tube 202. The internally threaded rectangular tube 202 moves up and down through the connecting block 203 to drive the sound and light alarm 204 to adjust the height to prevent it from being blocked by surrounding objects and to be easier to be discovered by staff.

[0036] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting upper thread breakage of a sewing machine, characterized in that: include A detection component (1), the detection component (1) comprising a mounting plate (101), a PLC controller (102) being provided in the middle of one side of the mounting plate (101), and a reflective infrared sensor (103) being provided at the bottom of the PLC controller (102); A reminder component (2), the reminder component (2) comprising a support tube (201), the support tube (201) being arranged at the top of one side of a mounting plate (101), an internally threaded rectangular tube (202) being slidably arranged inside the support tube (201), a connecting block (203) being arranged at the top of the internally threaded rectangular tube (202), an audible and visual alarm (204) being arranged at one side of the connecting block (203), and the reflective infrared sensor (103) and the audible and visual alarm (204) being both electrically connected to a PLC controller (102).

2. The upper thread breakage detection device for a sewing machine according to claim 1, characterized in that: A U-shaped frame (104) is provided at the bottom of one side of the mounting plate (101), and a rotating shaft (105) is rotatably inserted through one side of the U-shaped frame (104) via a bearing.

3. The upper thread breakage detection device for a sewing machine according to claim 2, characterized in that: A mounting block (106) is sleeved on the middle of the rotating shaft (105), and the reflective infrared sensor (103) is arranged on one side of the mounting block (106).

4. The upper thread breakage detection device for a sewing machine according to claim 2, characterized in that: A forward and reverse servo motor (107) is provided on the side of the U-shaped frame (104), and the output shaft of the forward and reverse servo motor (107) is connected to a worm (108).

5. The upper thread breakage detection device for a sewing machine according to claim 4, characterized in that: One end of the rotating shaft (105) is sleeved with a worm wheel (109) meshingly connected with the worm (108), and screws (1010) are slidably inserted through the four corners of the mounting plate (101).

6. The upper thread breakage detection device for a sewing machine according to claim 1, characterized in that: A transverse plate (205) is provided at the bottom of the inner wall of the support tube (201), and a screw rod (206) is rotatably inserted through the middle of the transverse plate (205) via a bearing, and the top end of the screw rod (206) is threadedly inserted into the interior of the internally threaded rectangular tube (202).

7. The upper thread breakage detection device for a sewing machine according to claim 6, characterized in that: A forward and reverse motor (207) is provided at the bottom end of the inner wall of the support cylinder (201), and the output shaft of the forward and reverse motor (207) is connected to the bottom end of the screw rod (206).

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