Electronic sewing machine with a stitch control device
AssigneeJanome Sewing Machine Co., Ltd.
InventorHideaki Takenoya
Life of this patent
Estimating the term…
Abstract
A single motor controls needle swing and fabric feed in a sewing machine. The motor is connected to a transmission which alternately locks either the needle swing or the fabric feed while releasing either the fabric feed or the needle swing as the case may be. The motor is operated in accordance with a predetermined program by an electronic control system. Multiplexers are used in order to alternately transmit feed data and needle control data to the motor. Two embodiments are taught: one embodiment being purely digital in nature, and the other embodiment including an analog feedback loop.
Claims17
A system for use in a sewing machine, the system operating a needle swing mechanism and a feed dog mechanism in synchronism with rotation of a main shaft that provides mechanical motion used to reciprocate a needle, and the system accomplishing such operation using only one motor comprising:
- exactly one motor;
- a transmission driven by the motor and linked to the main shaft, the transmission alternately connecting and disconnecting the needle swing mechanism and the feed dog mechanism to and from the motor in accordance with position of the main shaft, the transmission operating in a manner that when a one of the feed dog mechanism and the needle swing mechanism is connected to and moved by the motor, another one of the feed dog mechanism and the needle swing mechanism is disconnected from the motor and prevented from moving;
- and
- an electronic control system in which stitch control data is stored, the electronic control system being connected to the motor and the main shaft and driving the motor by reading out the stitch control data and operating the motor in accordance therewith in synchronism with rotation of the main shaft.
Dependencies are inferred from the claim text.