CN213681201U - A facial line broken string detection device and sewing machine for sewing machine - Google Patents

Abstract

The utility model provides a facial line broken string detection device and sewing machine for sewing machine, facial line broken string detection device is including installing in the thread trapper of sewing machine casing and sensor, the thread trapper has take-up spring and adjusts the seat, the take-up spring has the take-up portion that is used for bearing the weight of facial line, the shell of sensor is installed in sewing machine casing or take-up spring and is adjusted the seat, the probe of sensor has transmitting unit and receiving unit, the transmitting unit and the receiving unit of sensor are all just to the take-up portion that the take-up spring in the thread trapper colluded. This application can judge whether the facial line breaks according to the output signal of sensor to can detect the facial line broken string in real time and accurately, guarantee the real-time feedback whether the sewing machine facial line breaks, promote sewing efficiency and quality from this. In addition, this application simple structure has reduced the demand to thread trapper mounted position relative prior art, and only need set up a thread trapper for this application can be applicable to the sewing machine of multiple model.

Description

A facial line broken string detection device and sewing machine for sewing machine

Technical Field

The utility model relates to a sewing machine field especially relates to an upper thread broken string detection device for sewing machine.

Background

The flat sewing machine is the most basic sewing machine with the widest application range in the current market. In the sewing process of the flat sewing machine, a needle and a rotating shuttle in the flat sewing machine are matched with each other, the upper thread and the bottom thread are interwoven and sewn on the fabric in a linkage manner to form a lock-type stitch, and two or more layers of sewing materials are sewn together. The upper thread is arranged in the needle eye of the machine needle in a penetrating way, and the bottom thread is wound on the shuttle shell in the rotating shuttle. However, the flat sewing machine often has upper thread breakage during sewing, and further has a problem that an operator continues to perform a hollow seam without noticing the upper thread breakage, which significantly affects the efficiency of the sewing work and leaves a lot of hollow needle holes on the sewing material.

Further, in order to detect the state of the upper thread in real time and accurately judge whether the upper thread is broken, the existing flush joint machine is provided with an upper thread breakage detection device, for example, the chinese patent application specification with the application number of 201810502664.6 discloses a detection device with a thread breakage function, which comprises a thread clamping device bracket, an upper thread clamping device, a micro switch bracket, a lower thread clamping device, a micro switch and a mounting plate, wherein the micro switch is arranged between the upper thread clamping device and the lower thread clamping device, the upper thread bypasses a cantilever of the micro switch, the cantilever is pulled down by the force after the thread is tensioned to start normal work, and after the thread is broken, the cantilever returns to the original position to complete thread breakage detection. However, the above-described detection device has a very high demand for the positions of the upper gripper, the lower gripper, and the micro switch, and two grippers need to be provided, which is not suitable for sewing machines of all models.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art's shortcoming, the to-be-solved technical problem of the utility model is to provide a facial line broken string detection device for sewing machine, its sewing machine that can be applicable to multiple model under the prerequisite of accurate real-time detection facial line broken string.

In order to achieve the above object, the present invention provides an upper thread breakage detecting device for a sewing machine, comprising a thread clamp installed on a sewing machine housing, the thread clamp having a thread take-up spring and a thread take-up spring adjusting seat, the thread take-up spring having a thread take-up hook for bearing an upper thread; the upper thread breakage detection device further comprises a sensor, a shell of the sensor is installed on a sewing machine shell or a take-up spring adjusting seat, a probe of the sensor is provided with a transmitting unit and a receiving unit, and the transmitting unit and the receiving unit of the sensor are opposite to a take-up hook part of a take-up spring in the thread clamping device.

Furthermore, the upper thread breakage detection device also comprises an electric control module and an alarm unit of the sewing machine, and a microcontroller and the alarm unit of the sensor are connected with the electric control module.

Further, the alarm unit is an audible and visual alarm.

Further, the microcontroller of the sensor is integrated within a backstitch switch assembly in the sewing machine.

Furthermore, a connecting part is arranged on the shell of the sensor, an adjusting long groove is formed in the connecting part, the connecting part is fixedly connected with the shell of the sewing machine through a screw, and the screw penetrates through the adjusting long groove of the connecting part.

Furthermore, the adjusting long groove is an arc-shaped groove, and the circle center of the arc-shaped groove is located on the central axis of the wire clamping device.

Furthermore, the connecting part is a sheet metal body.

Furthermore, the take-up spring adjusting seat is provided with an external thread connecting section, a threaded mounting hole is formed in the shell of the sensor, and the threaded mounting hole is in threaded connection with the external thread connecting section of the take-up spring adjusting seat.

Further, the sensor is a reflective infrared sensor.

The application also provides a sewing machine, be configured as above in the sewing machine facial line broken string detection device.

As described above, the utility model relates to a facial line broken string detection device and sewing machine for sewing machine has following beneficial effect:

when the sewing machine is used for sewing normally, if the upper thread is not broken, the thread taking-up hook part of the thread taking-up spring swings under the action of periodic pulling of the upper thread, the thread taking-up hook part of the thread taking-up spring swings in each sewing period, an optical signal received by a receiving unit of the sensor periodically changes in strength, and the sensor outputs periodic high and low levels; if the upper thread is broken, the upper thread loses tension, the thread taking-up hook part of the thread taking-up spring can be still and does not swing any more, the optical signals received by the receiving unit of the sensor have the same intensity, and the sensor only outputs high level or low level. Therefore, whether the upper thread is broken can be judged according to the output signal of the sensor, so that the upper thread can be accurately detected in real time, the real-time feedback of whether the upper thread of the sewing machine is broken is ensured, and the sewing efficiency and the sewing quality are improved. In addition, this application simple structure has reduced the demand to thread trapper mounted position relative prior art, and only need set up a thread trapper for this application can be applicable to the sewing machine of multiple model.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of an upper thread breakage detecting device according to the present application.

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

Fig. 3 is a diagram showing a positional relationship between a probe and a take-up spring of the sensor according to the present application.

Fig. 4 is a schematic structural diagram of a second embodiment of the upper thread breakage detecting device in the present application.

Fig. 5 is a schematic structural view of a housing of the sensor of fig. 4.

Description of the element reference numerals

10 casing

20 thread clamping device

21 take-up hook

30 sensor

31 transmitting unit

32 receiving unit

33 connecting part

34 long regulating groove

35 screw thread mounting hole

40 screw

50 wire

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. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be considered as the scope of the present invention without substantial changes in the technical content.

The application provides a sewing machine, dispose the upper thread broken string detection device in this sewing machine, the upper thread broken string detection device is used for the real-time detection upper thread whether broken string.

As shown in fig. 1 to 3, or fig. 4 and 5, the upper thread breakage detecting apparatus for a sewing machine according to the present application includes a thread clamp 20 and a sensor 30 both mounted on a rear surface of a sewing machine housing 10; wherein, the thread tension device 20 is provided with a thread take-up spring and a thread take-up spring adjusting seat, the thread take-up spring is provided with a thread take-up hook part 21 for bearing upper thread, and the thread take-up spring adjusting seat is directly and fixedly arranged on the rear surface of the sewing machine shell 10; the sensor 30 is provided with a shell, a probe and a microcontroller, the shell of the sensor 30 is fixedly arranged on the sewing machine shell 10 or the take-up spring adjusting seat, the probe of the sensor 30 is provided with a transmitting unit 31 and a receiving unit 32, the transmitting unit 31 and the receiving unit 32 of the sensor 30 are both connected with the microcontroller, and the transmitting unit 31 and the receiving unit 32 of the sensor 30 are both over against the take-up hook part 21 of the take-up spring in a static state in the thread clamp 20; alternatively, when the thread take-up hook 21 of the thread take-up spring is not pulled by the thread, the thread take-up hook 21 is in a rest state, and the transmitting unit 31 and the receiving unit 32 of the sensor 30 are both opposed to the thread take-up hook 21 in this state.

In the above-mentioned upper thread breakage detecting device, the sensor 30 is a reflective photoelectric sensor, the emitting unit 31 of the sensor 30 emits a light signal and projects the light signal onto the thread take-up hook 21 of the thread take-up spring, and the thread take-up hook 21 of the thread take-up spring reflects the light signal to the receiving unit 32 of the sensor 30. When the sewing machine is used for normal sewing, if the upper thread is not broken, the thread picking hook part 21 of the thread picking spring swings under the action of periodic pulling of the upper thread, in each sewing period, namely in the process of sewing each needle, the thread picking hook part 21 of the thread picking spring swings, so that the thread picking hook part 21 is periodically switched between two states of a transmitting unit 31 and a receiving unit 32 which are over against the sensor 30 and a transmitting unit 31 and a receiving unit 32 which are deviated from the sensor 30, the sensor 30 can detect the thread picking hook part 21 of the thread picking spring at least once and cannot detect the thread picking hook part 21 of the thread picking spring at least once, and therefore, the optical signal received by the receiving unit 32 of the sensor 30 is periodically changed in intensity, and the sensor 30 outputs periodic high and low levels, so that the normal and unbroken upper thread is judged; if the upper thread is broken, the upper thread loses tension, the thread take-up hook 21 of the thread take-up spring is still and does not swing any more, the thread take-up hook 21 always faces the transmitting unit 31 and the receiving unit 32 of the sensor 30, the optical signal received by the receiving unit 32 of the sensor 30 has the same intensity, and the sensor 30 only outputs high level or low level, in this embodiment, continuously outputs high level, thereby judging the breakage of the upper thread. Therefore, the present application can determine whether the upper thread is broken according to the output signal of the sensor 30: when the sensor 30 outputs periodic high and low levels, the upper thread is judged to be normal and not broken; when the sensor 30 continues to output a high level, it is determined that the upper thread is broken. In summary, the present application has the following advantages:

1. the method and the device can accurately detect the upper thread breakage in real time, ensure the real-time feedback of whether the upper thread of the sewing machine is broken, avoid the phenomena of empty joint and missing joint caused by the upper thread breakage in the sewing process, and improve the sewing efficiency and quality.

2. The structure of the device is simple, the thread clamping device 20 is a configured part of the original sewing machine, so that the device can be used for realizing the function of detecting the thread breakage of the upper thread on the machine only by additionally arranging the sensor 30 on the original basis of the sewing machine without greatly changing the original sewing machine; simultaneously, reduced the demand to thread trapper 20 mounted position compared with prior art, and only need set up a thread trapper 20, make this application can be applicable to the sewing machine of multiple model from this, realize the broken string of other models and detect, and do not confine to the flush joint machine.

3. The application is non-contact measurement and has a long service life.

4. Even if the sewing machine is in the sewing environment with small needle pitch and small tension of the thread clamping device 20, the upper thread can still pull the thread take-up hook part 21 of the thread take-up spring, so that whether the upper thread is broken can still be accurately detected in real time.

Preferably, the sensor 30 is a reflective infrared sensor, the emitting unit 31(LED) of the reflective infrared sensor emits infrared light, the infrared light irradiates on the thread-taking-up hook 21 of the thread-taking-up spring, the thread-taking-up hook 21 reflects part of the infrared light to the receiving unit 32 of the reflective infrared sensor, the receiving unit 32 of the reflective infrared sensor is a photodiode or a phototransistor, and the receiving unit 32 of the reflective infrared sensor converts the received light intensity into a voltage signal and outputs the voltage signal to the microcontroller.

Furthermore, the upper thread breakage detection device also comprises an electric control module and an alarm unit of the sewing machine, wherein the microcontroller and the alarm unit of the sensor 30 are connected with the electric control module through leads, and the electric control module is used for controlling the sewing machine and is connected with a main motor of the sewing machine. The microcontroller in the sensor 30 outputs a judgment signal to the electronic control module, when the electronic control module judges that the upper thread is broken according to the output of the sensor 30, the electronic control module controls the main motor of the sewing machine to stop rotating, the sewing machine stops immediately, and meanwhile, the electronic control module triggers the alarm unit to give an alarm to wait for the operator to thread again. Preferably, the alarm unit is an audible and visual alarm, and audible and visual alarm is performed during alarm. As shown in fig. 1, the sensor 30 is connected to the electronic control module by a wire 50.

Further, the sensor 30 may be a one-piece structure, in which case the microcontroller of the sensor 30 is integrated within the housing of the sensor 30; alternatively, the sensor 30 is a split configuration, in which case the microcontroller of the sensor 30 is integrated into the backstitch switch assembly in the sewing machine.

Further, the fixed mounting of the housing of the sensor 30 in the present application has the following two embodiments.

In the first embodiment, the housing of the sensor 30 is directly and fixedly mounted on the sewing machine housing 10, at this time, as shown in fig. 2 and 3, the housing of the sensor 30 is provided with a connecting portion 33, an adjusting long groove 34 is formed in the connecting portion 33, the connecting portion 33 is fixedly connected with the sewing machine housing 10 through a screw 40, the screw 40 is arranged in the adjusting long groove 34 of the connecting portion 33 in a penetrating manner, and a gasket is sleeved on the screw 40; the sensor 30 is located between the thread tension device 20 and the sewing machine housing 10 in the front-rear direction, that is, the sensor 30 is located on the front side of the thread tension device 20 and also on the rear side of the sewing machine housing 10. Preferably, the long adjusting groove 34 is an arc-shaped groove, and the center of the arc-shaped groove is located on the central axis of the wire clamp 20; by providing the long adjustment groove 34, the position of the probe of the sensor 30 relative to the thread take-up hook 21 in a stationary state can be adjusted, so that the mounting position of the probe of the sensor 30 can be adjusted according to the position of the thread take-up spring, and the reliability of the detection of the thread breakage of the upper thread can be ensured. In addition, the connecting part 33 is a sheet metal body, which improves the connection reliability with the sewing machine housing 10.

In the second embodiment, the housing of the sensor 30 is directly and fixedly mounted on the take-up spring adjusting seat, at this time, as shown in fig. 4 and 5, the take-up spring adjusting seat is provided with an external thread connection section, a thread mounting hole 35 is formed in the housing of the sensor 30, the thread mounting hole 35 is in threaded connection with the external thread connection section of the take-up spring adjusting seat, so that the housing of the sensor 30 is fixedly connected to the periphery of the take-up spring adjusting seat, the housing of the sensor 30 can rotate relative to the take-up spring adjusting seat, the position of the probe of the sensor 30 relative to the take-up hook 21 in a static state can be adjusted, the mounting position of the probe of the sensor 30 can be adjusted along with the position of the take-up spring, and the reliability of the.

Further, the sensor 30 has an LED indicator lamp mounted on the rear surface of the housing for the operator of the upper thread, the LED indicator lamp being connected to the microcontroller of the sensor 30. When the position of the probe of the sensor 30 relative to the thread take-up hook 21 is adjusted, the microcontroller of the sensor 30 controls the flashing speed of the LED indicator lamp according to the intensity of the light signal received by the receiving unit 32: when the optical signal received by the receiving unit 32 is weak, it indicates that the probe of the sensor 30 is not well aligned with the thread take-up hook 21, and at this time, the flashing speed of the LED indicator light is slow; when the optical signal received by the receiving unit 32 is strong, it indicates that the probe of the sensor 30 is better aligned with the thread take-up hook 21, and at this time, the flashing speed of the LED indicator light is fast; when the light signal received by the receiving unit 32 is very strong, it indicates that the probe of the sensor 30 is just over against the thread take-up hook 21, and at this time, the LED indicator lights stably. Therefore, when the operator adjusts the installation position of the sensor 30, the operator can judge whether the current installation position of the sensor 30 is reasonable or not through the flashing speed of the LED indicating lamp, so that the convenience of the installation of the sensor 30 is improved, and the accuracy of the subsequent facial line breakage detection is improved.

Further, the emission unit 31 of the reflective infrared sensor emits infrared light in a pulse manner, that is, the emission unit 31 of the reflective infrared sensor emits infrared light at intervals; the receiving unit 32 of the reflective infrared sensor releases and amplifies the voltage signal and then outputs the amplified voltage signal to the microcontroller, the microcontroller performs A/D conversion on the voltage signal, and the microcontroller processes and judges the obtained digital signal. In particular, since the emitting unit 31 of the sensor 30 emits pulsed infrared light, each time the microcontroller calculates, the microcontroller collects and subtracts the voltage signal output by the receiving unit 32 when the emitting unit 31 is not emitting light and the voltage signal output by the receiving unit 32 when the emitting unit 32 is emitting light, and the voltage signal output by the receiving unit 32 when the emitting unit 31 is not emitting light is a signal when the pick-up hook 21 reflects ambient light to the receiving unit 32, so as to obtain a variation of the photoelectric signal during light emission relative to before light emission, and the microcontroller determines whether the pick-up hook 21 of the pick-up spring is detected according to the variation. Therefore, this application uses pulse technique, judges whether the facial line is broken through the poor variable quantity of signal amplitude before and after the comparison emission unit 31 is luminous, effectively gets rid of the influence of external environment light for sensor 30 has higher reliability, does not receive the interference of environment light, and then makes this application can normally work under various environment light.

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. Modifications and variations can be made to the above-described embodiments by those skilled in the art 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 facial line broken string detection device for sewing machine, is including installing in thread tension ware (20) of sewing machine casing (10), thread tension ware (20) have take-up spring and adjust the seat, the take-up spring has the take-up portion of colluding (21) that is used for bearing the facial line, its characterized in that: the upper thread breakage detection device further comprises a sensor (30), a shell of the sensor (30) is installed on a sewing machine shell (10) or a take-up spring adjusting seat, a probe of the sensor (30) is provided with a transmitting unit (31) and a receiving unit (32), and the transmitting unit (31) and the receiving unit (32) of the sensor (30) are both right opposite to a take-up hook part (21) of the take-up spring in the thread clamp (20).

2. The upper thread breakage detecting device according to claim 1, characterized in that: the sewing machine further comprises an electric control module and an alarm unit of the sewing machine, and the microcontroller and the alarm unit of the sensor (30) are connected with the electric control module.

3. The upper thread breakage detecting device according to claim 2, characterized in that: the alarm unit is an audible and visual alarm.

4. The upper thread breakage detecting device according to claim 2, characterized in that: the microcontroller of the sensor (30) is integrated into a backstitch switch assembly in a sewing machine.

5. The upper thread breakage detecting device according to claim 1, characterized in that: the shell of the sensor (30) is provided with a connecting part (33), an adjusting long groove (34) is formed in the connecting part (33), the connecting part (33) is fixedly connected with the sewing machine shell (10) through a screw (40), and the screw (40) penetrates through the adjusting long groove (34) of the connecting part (33).

6. The upper thread breakage detecting device according to claim 5, characterized in that: the long adjusting groove (34) is an arc-shaped groove, and the circle center of the arc-shaped groove is located on the central axis of the wire clamping device (20).

7. The upper thread breakage detecting device according to claim 5, characterized in that: the connecting part (33) is a sheet metal body.

8. The upper thread breakage detecting device according to claim 1, characterized in that: the take-up spring adjusting seat is provided with an external thread connecting section, a threaded mounting hole (35) is formed in the shell of the sensor (30), and the threaded mounting hole (35) is in threaded connection with the external thread connecting section of the take-up spring adjusting seat.

9. The upper thread breakage detecting device according to claim 1, characterized in that: the sensor (30) is a reflective infrared sensor.

10. A sewing machine characterized by: the sewing machine is provided with the upper thread breakage detecting device according to any one of claims 1 to 9.

Images