Method and system for detecting fabric of a sewing machine

Abstract

The invention discloses a method and system for detecting fabric of a sewing machine. The method comprises: when an infrared emitting diode opposite to an infrared photosensitive diode in an infrared light receiving circuit is activated, receiving a first sampling signal sent by an infrared light receiving circuit; When the infrared emitting diode is turned off, the second sampling signal sent by the infrared light receiving circuit is received; the first infrared light energy corresponding to the first sampling signal and the second infrared light energy corresponding to the second sampling signal are generated, and the first infrared light energy is calculated The difference between the energy and the second infrared light energy; according to the comparison between the difference and the preset infrared light energy, it is determined whether there is cloth at the corresponding position of the infrared photosensitive diode; the present invention can effectively remove the interference of infrared light in the environment on the detection of cloth, It also reduces the time for fabric detection, which is beneficial to control the length of the braid when the sewing machine trims the thread; and through the setting of the infrared photosensitive diode, it can sense the light intensity more accurately and improve the accuracy of fabric detection.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a method and system for detecting cloth of a sewing machine. Background technique [0002] With the development of sewing machine technology, more and more sewing machines are moving toward automation. The sewing machine detects the state of the fabric on the sewing table through the fabric detection sensor, and performs corresponding sewing actions, such as lifting the presser foot and trimming the thread. Normally, the fabric detection sensor on the sewing machine emits infrared light from the infrared light emitting tube, and receives the infrared light from the infrared photosensitive triode to sense the state of the fabric. [0003] Some sewing machines are limited by working conditions and cannot avoid sunlight. Infrared light in sunlight will affect the work of the fabric detection sensor, and in severe cases, the fabric detection sensor will fail, causing the se...

AI Technical Summary

Problems solved by technology

However, this processing method takes a long time to obtain a stable and consistent signal. For high-speed sewing machines, it will produce some undesirable results, such as poor control of the length of the thread when trimming the thread, etc., and this anti-sunlight The treatment method will fail when the intensity of sunlight radiation is high

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