Sewing machine with automatic thread take-up and threading

Abstract

A sewing machine for automatic thread taking-up and threading comprising a guide groove for guiding a needle thread to a threading preparatory position in the vicinity of a needle bar via a thread taking-up preparatory position intersecting a thread take-up moving area, a sewing machine motor driver for extracting the needle thread along the thread take-up moving area and for instructing a thread take-up to catch the needle thread, a pulse motor driver for threading the needle thread to an eye of a needle, a threading switch for generating signals, and an electronic control circuit for controlling the pulse motor driver and the sewing machine driver at prescribed timings in response to the signals from the threading switch. In the sewing machine, an operator has only to prepare a needle thread along the guide groove and push the threading switch. The electronic control circuit then controls the pulse motor driver and the sewing machine driver for the thread taking-up operation and the threading operation, respectively. Any operator can operate the sewing machine with easiness because the thread take-up operation and the threading operation are automatically performed without complicated cam mechanism or linkage mechanism. In addition, the sewing machine is easy to manufacture and the timing of operations can easily be adjusted.