CN213624702U

CN213624702U - A facial line broken string detection device and sewing machine for sewing machine

Info

Publication number: CN213624702U
Application number: CN202022556851.8U
Authority: CN
Inventors: 陈龙; 陈江震; 潘建国; 于恒基
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-07-06
Anticipated expiration: 2030-11-06

Abstract

The utility model provides a facial line broken string detection device and sewing machine for sewing machine, facial line broken string detection device include sewing machine casing, can wear to establish take-up lever in the sewing machine casing with luffing motion, and all install the thread hook support and the electron tension disk on the sewing machine casing, have the hook of crossing on the hook support, the facial line passes from take-up lever, hook of crossing and electron tension disk in proper order; the upper thread breakage detection device further comprises a sensor, a shell of the sensor is mounted on the thread hook support, 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 arranged side by side from front to back and are opposite to the upper thread in the thread hook in a stretched state. 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.

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.

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, can detect whether the facial line breaks in real time and accurately.

In order to achieve the above object, the utility model provides a facial line detection device that breaks thread for sewing machine, but wear to establish the take-up lever in the sewing machine casing and all install thread hook support and the electron tension ware on the sewing machine casing including the sewing machine casing, luffing motion, the last thread hook that has of thread hook support, the facial line passes its characterized in that from the take-up lever in proper order, thread hook and electron tension ware: the upper thread breakage detection device further comprises a sensor, a shell of the sensor is mounted on the thread hook support, 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 arranged side by side from front to back and are opposite to the upper thread in the thread hook in a stretched state.

Furthermore, the facial line broken line detection device also comprises an electric control module and an alarm unit, and the sensor and the alarm unit are connected with the electric control module.

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

Furthermore, the two wire passing hooks are arranged up and down; in the up-down direction, the sensor is positioned between the two wire passing hooks.

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 normal sewing, if the upper thread is not broken, the take-up lever swings up and down in each sewing period, the upper thread is straightened when the take-up lever moves up, the upper thread is loosened when the take-up lever moves down, so that the section of the upper thread penetrating through the thread passing hook not only moves up and down, but also swings back and forth simultaneously, namely, the straightened upper thread just swings to one side of the transmitting unit and the receiving unit of the sensor and can reflect an optical signal sent by the transmitting unit to the receiving unit, the loosened upper thread deviates from the transmitting unit and the receiving unit of the upper thread sensor and cannot reflect the optical signal sent by the transmitting unit to the receiving unit, so that the optical signal received by the receiving unit of the sensor periodically changes in strength, and the sensor outputs ordered high and low levels; if the upper thread is broken, the upper thread is picked out of the thread passing hook by the thread picking rod or is left in the thread passing hook by the thread picking rod, but the upper thread has no tension and does not move periodically along with the thread picking rod any more, and the sensor cannot output ordered high and low levels. 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, the method and the device can be also applied to the upper thread breakage detection of various types of sewing machines, and are not limited to flat sewing machines.

Drawings

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

FIG. 2 is a schematic view showing the relationship between the upper thread and the sensor when the thread take-up lever moves upward.

FIG. 3 is a schematic view showing the relationship between the upper thread and the sensor when the thread take-up lever moves down.

Description of the element reference numerals

10 Sewing machine casing

20 take-up lever

30 wire hook support

31 wire-passing hook

40 electronic wire clamping device

50 sensor

51 transmitting unit

52 receiving unit

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, the upper thread breakage detecting device for a sewing machine according to the present application includes a sewing machine housing 10, a thread take-up lever 20 vertically swingably inserted in the sewing machine housing 10, a thread hook support 30 and an electronic thread trapper 40 both mounted on a rear surface of the sewing machine housing 10, and a sensor 50. Wherein, the right side of the wire hook bracket 30 is provided with a wire passing hook 31; in the up-down direction, the take-up lever 20, the thread passing hook 31 and the electronic thread holder 40 are sequentially arranged from top to bottom; the upper thread passes through the thread take-up lever 20, the thread passing hook 31 and the electronic thread holder 40 in sequence. The sensor 50 has a housing, a probe and a microcontroller; the housing of the sensor 50 is mounted to the hook bracket 30, and the sensor 50 is integrally mounted to the hook bracket 30, the sensor 50 being integrally located on the left side of the section of the upper thread passing through the thread passing hook 31; the probe of the sensor 50 has a transmitting unit 51 and a receiving unit 52, and the transmitting unit 51 and the receiving unit 52 of the sensor 50 are arranged side by side in front and behind and are both facing the upper thread in a stretched state in the thread passing hook 31. In addition, the arrangement direction of the emitting unit 51 and the receiving unit 52 is also the moving direction of the cloth when the sewing machine sews.

In the above-mentioned thread breakage detecting device, the sensor 50 is a reflective photoelectric sensor. When the sewing machine is used for normal sewing, if the upper thread is not broken, the take-up lever 20 swings up and down in each sewing period, namely, in the process of sewing each needle, the upper thread is gradually straightened when the take-up lever 20 moves up, and the upper thread is gradually loosened when the take-up lever 20 moves down, so that the section of the upper thread penetrating through the thread passing hook 31 not only moves up and down, but also swings back and forth. As shown in fig. 2, the stretched upper thread swings right to the right of the transmitting unit 51 and the receiving unit 52 of the sensor 50, the transmitting unit 51 of the sensor 50 transmits the light signal and projects the light signal onto the stretched upper thread, and the stretched upper thread reflects the light signal to the receiving unit 52 of the sensor 50. As shown in fig. 3, the loosened upper thread swings backward in a direction away from the sewing machine housing 10, deviating backward from the transmitting unit 51 and the receiving unit 52 of the sensor 50, and the loosened upper thread cannot reflect the optical signal emitted from the transmitting unit 51 to the receiving unit 52. Therefore, when the sewing machine sews a stitch, the upper thread passes through the right side of the probe of the sensor 50 twice, the light signal received by the receiving unit 52 of the sensor 50 is periodically changed, the sensor 50 outputs orderly high and low levels, which shows that the upper thread normally moves along with the up and down swing of the thread take-up lever 20. If the upper thread is broken, the take-up lever 20 picks up the upper thread out of the thread passing hook 31 or the upper thread remains in the thread passing hook 31, but the upper thread has no tension and does not move periodically with the take-up lever 20 any more, and the sensor 50 does not output ordered high and low levels within the set number of needles. In conclusion, the upper thread breakage can be detected accurately in real time, real-time feedback of whether the upper thread of the sewing machine is broken or not is guaranteed, the phenomena of empty sewing and missing sewing caused by the upper thread breakage in the sewing process are avoided, and the sewing efficiency and quality are improved; meanwhile, the method is a non-contact type measurement, and has longer service life and higher reliability; the upper thread breakage detection device can also be suitable for upper thread breakage detection of various types of sewing machines, and is not limited to a flat sewing machine.

As shown in fig. 1, the thread hook support 30 is fixedly installed on the rear surface of the sewing machine case 10 by screws; two wire passing hooks 31 which are arranged up and down are arranged on the right side of the wire hook bracket 30; the wire hook bracket 30 is provided with a mounting groove between the two wire passing hooks 31, and the sensor 50 is fixed in the mounting groove of the wire hook bracket 30; therefore, the sensor 50 is located between the two wire passing hooks 31 in the up-down direction.

Further, the upper thread breakage detecting device further comprises an electric control module and an alarm unit, wherein the sensor 50 and the alarm unit are connected with the electric control module, 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 50 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 50, 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.

Preferably, the sensor 50 is a reflective infrared sensor, the emitting unit 51(LED) of the reflective infrared sensor emits infrared light, the infrared light irradiates on a stretched upper thread, the stretched upper thread reflects part of the infrared light to the receiving unit 52 of the reflective infrared sensor, the receiving unit 52 of the reflective infrared sensor is a photodiode or a phototransistor, and the receiving unit 52 of the reflective infrared sensor converts the received light intensity into a voltage signal and outputs the voltage signal to the microcontroller.

Further, the emission unit 51 of the reflective infrared sensor emits infrared light in a pulse manner, that is, the emission unit 51 of the reflective infrared sensor emits infrared light at intervals; the receiving unit 52 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. Particularly, the emitting unit 51 of the sensor 50 emits pulsed infrared light, and each time the microcontroller calculates, the microcontroller collects and subtracts a voltage signal output by the receiving unit 52 when the emitting unit 51 does not emit light and a voltage signal output by the receiving unit 52 when the emitting unit 52 emits light, and the voltage signal output by the receiving unit 52 when the emitting unit 51 does not emit light is a signal when a straight upper thread reflects ambient light to the receiving unit 52, so that a variation of a photoelectric signal in light emission relative to that before light emission is obtained, and the microcontroller determines whether the upper thread swings back and forth periodically 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 51 is luminous, effectively gets rid of the influence of external environment light for sensor 50 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

1. The utility model provides a facial line broken string detection device for sewing machine, includes sewing machine casing (10), but wears to establish take-up lever (20) in sewing machine casing (10) with luffing motion and all installs thread hook support (30) and electron tension disk (40) on sewing machine casing (10), have on thread hook support (30) and cross thread hook (31), the facial line passes its characterized in that in take-up lever (20), cross thread hook (31) and electron tension disk (40) in proper order: the upper thread breakage detection device further comprises a sensor (50), a shell of the sensor (50) is installed on the thread hook support (30), a probe of the sensor (50) is provided with a transmitting unit (51) and a receiving unit (52), and the transmitting unit (51) and the receiving unit (52) of the sensor (50) are arranged side by side in the front-back direction and are opposite to the upper threads in the thread passing hook (31) in the stretched state.

2. The upper thread breakage detecting device according to claim 1, characterized in that: the device also comprises an electronic control module and an alarm unit, wherein the sensor (50) and the alarm unit are connected with the electronic 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 1, characterized in that: the two wire passing hooks (31) are arranged up and down; in the up-down direction, the sensor (50) is positioned between the two wire passing hooks (31).

5. The upper thread breakage detecting device according to claim 1, characterized in that: the sensor (50) is a reflective infrared sensor.

6. 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 5.