Abstract: This invention is directed to an electric zig zag sewing machine comprising a plurality of stacked pattern cams mounted on a rotation axis, each of the cams bearing different information of corresponding pattern of stitches, a cam follower mounted on a rod for movement in the direction parallel to said axis, a plurality of select switches for selecting any one of the pattern cams and electric control circuit arrangement for moving the cam follower to a position corresponding to any one of the cams selected by one of the select switches.

Abstract: A zigzag sewing machine of a sewing pattern selectable type is disclosed having a cloth advancing mechanism for advancing a cloth at a predetermined pitch after every one stitch and a pitch control dial for controlling the length of said pitch. A plurality of indication lamps are disposed around the control dial for indicating an available range for the selected sewing pattern.

Abstract: The present invention is directed to an electric sewing machine provided with a button hole sewing device which comprises a plurality of cams each individually bearing information of tacking stitches, left side stitches of a button hole and right side stitches of the button hole, means for instructing button hole stitching operation and an electric control circuit arrangement which operates to select the cam for tacking stitches upon operation of the instructing means and to select the cam for one of the side stitches automatically after a predetermined number of the tacking stitches are perfected.

Abstract: In a sewing machine capable of electrically sewing an object subject to a sewing pattern selected, sewing pattern displaying arrangements according to the present invention comprise a pattern cams unit, a pattern cam follower unit, a pattern selector mechanism, and an electric circuitry means, wherein a transient process from one sewing pattern selection to the other successive sewing pattern selection is to be displayed in a visible mode.

Abstract: A zigzag sewing machine of a sewing pattern selectable type is disclosed having a cloth advancing mechanism for advancing a cloth at a predetermined pitch after every one stitch and a pitch control dial for controlling the length of said pitch. A plurality of indication lamps are provided for producing a warning signal when an erroneous combination between the cam selection and pitch adjustment is constituted.

Abstract: In an automatic electronic sewing machine including a read only memory (ROM) and a random access memory (RAM), the read only memory (ROM) stores pattern data for performing buttonhole stitch operation in the forward direction and pattern data for performing buttonhole stitch operation in the backward direction. A first control switch functions to conduct the buttonhole stitch operation in the forward direction by a desired length selected by the operator. A storage means is provided for storing the length information of the buttonhole stitch formation in the forward direction, or the repetition number of a unit pattern in the forward direction. A second control switch functions to conduct the buttonhole stitch operation in the backward direction by the length stored in the storage means.

Abstract: A read only memory (ROM) is provided for storing digital information related to stitch patterns and control instructions for stitch formation purposes. A keyboard means is provided for selecting a desired stitch pattern and control instruction stored in the ROM. Selected digital information is introduced into a random access memory (RAM) and temporarily stored therein. The RAM develops control signals for controlling the needle position and the work feed in accordance with the control instruction selected through the keyboard means.

Abstract: In an automatic electronic sewing machine including a read only memory (ROM) and a random access memory (RAM), a needle is controlled to swing in order to shift the penetration position. In a button mode, the needle is controlled to swing to a predetermined position corresponding to one of a pair of throughholes formed in a button, and the other swing position corresponding to the other of the pair of throughholes formed in the button is variably controlled in response to the size of the button.