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Abstract

An improved household type sewing machine having a needle bar and a feed dog wherein an actuator adjusts the transverse position of the needle bar and the positional displacement of the feed dog in response to control signals provided thereto, in which a microcomputer integrated circuit is provided for controlling the machine in response to keyboard selectable pattern and control information stored in a static memory which is interchangeable with other memory configurations to provide different patterns, such as alphabetic stitch patterns. The keyboard contains a numeric display with each of the patterns having a corresponding numeric equivalent which is displayed on the keyboard to indicate which pattern is selected. The microcomputer is capable of selectively controllably functionally operating on the stored stitch pattern data in response to input control signals from the keyboard for controllably redefining the stored stitch pattern data to selectively create output control signals for the actuator different from the output control signals corresponding to any one of the stored stitch patterns whereby the position of the stitch forming instrumentalities may be selectively varied to redefine a stitch pattern arrangement different from any one of the stored stitch patterns. Thus, for example, a constant stitch density may be maintained for a selected pattern as the length of the pattern is varied by the operator in such a manner that the selected stitch pattern shape may be maintained.

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First Claim