ES387415A3 - A sewing machine that includes a main clutch controlled by pedal. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A sewing machine including a main clutch controlled by a pedal, operated in the forward position of the machine control pedal, a device for cutting the thread, and a needle positioning device having rotating means, such as a switching drum, connected to the main shaft of the sewing machine for electrically controlling an electromagnetic auxiliary brake and clutch unit; to move the shaft of the machine by means of a reduction gear at a reduced speed, and to stop the machine axis in the required position of the needle, respectively, the arrangement being such that, when the pedal is returned from its operative position at its stop position, the electromagnetic clutch acts to move the machine shaft, at said reduced speed until the machine axis is stopped by the electromagnetic brake action in the lower position of the needle and the machine and that, in a subsequent movement of the pedal in the opposite direction to a rear position, the electromagnetic clutch is operated again, whereby the needle is still moved at said reduced speed to be stopped by the action of said electromagnetic brake in the position of the needle, with the device for cutting the thread being actuated during said last movement of the needle from the lower position of the needle to the upper one, comprising the said sewing machine furthermore has an electric control circuit comprising a first control relay, adapted to be activated by means of a first pedal-operated contact in the forward position of the pedal and arranged to close a first activating circuit for the electromagnetic clutch, and a second control relay having a relay coil connected in series with a second, pedal operated contact, closed in the rear position of the pedal, with a normally closed contact, of the first control relay, and with a contact of the needle positioning device that opens in the upper position of the needle closing said second control relay, when excited, a second activating circuit for the electromagnetic clutch, so that the needle, when reaching its lower position, continues its advance to its upper position to stand on it, being the device to cut the wire electrically controlled by an additional contact l on needle positioning device to cause the action of this cutting device during the movement of the needle from the lower position to the upper one. (Machine-translation by Google Translate, not legally binding)