Zigzag work-jogging attachments for sewing machines

Claim 1

AN ORNAMENTAL ZIGZAG STITCHING ATTACHMENT FOR USE WITH A SEWING MACHINE COMPRISING, AN ATTACHMENT FRAME HAVING A TRANSVERSE SLOT, AN ACTUATING LEVER PIVOTED TO SAID FRAME FOR VERTICAL OSCILLATING MOVEMENT AS A CONSEQUENCE OF VERTICAL ENDWISE RECIPROCATION OF THE NEEDLE BAR OF THE SEWING MACHINE, AN OSCILLATING PLATE SUPPORTED ON SAID FRAME FOR LATERAL OSCILLATORY MOVEMENT, OSCILLATING MEANS FOR CONVERTING THE VERTICAL OSCILLATORY MOVEMENT OF SAID ACTUATING LEVER INTO LATERAL OSCILLATORY MOVEMENT OF SAID OSCILLATING PLATE, SAID OSCILLATORY PLATE HAVING A PRESSER FOOT AT ONE END THEREOF WHICH IS HELD UNDER PRESSURE AGAINST WORK FABRIC THEREBENEATH, SAID OSCILLATING PLATE TENDING TO OSCILLATE ABOUT SAID PRESSER FOOT AS A CENTER OF OSCILLATION, A PATTERN PLATE SUPPORTED ON SAID FRAME FOR MOVEMENT LENGTHWISE THEREOF AND HAVING A PATTERN APERTURE FOR CONTROLLING THE LATERAL OSCILLATORY MOVEMENT OF SAID OSCILLATING PLATE, RECIPROCATING MEANS FOR CONVERTING THE VERTICAL OSCILLATORY MOVEMENT OF SAID ACTUATING LEVER INTO LENGTHWISE RECIPRICATORY MOVEMENT OF SAID PATTERN PLATE, AND A LUG ON SAID OSCILLATING PLATE AT THE END THEREOF REMOTE FROM SAID PRESSER FOOT, SAID LUG BEING IN ENGAGEMENT WITH SAID PATTERN APERTURE TO CAUSE SAID OSCILITATING PLATE TO BE OSCILLATED BY SAID OSCILLATING MEANS ABOUT AN AXIS OF OSCILLATION WHICH MAY BE DISPLACED FROM SAID PRESSER FOOT IN ACCORDANCE WITH THE DEGREE OF ANGAGEMENT OF SAID LUG IN THE PATTERN APERTURE WHEREBY THE AMPLITUDE OF OSCILLATION OF THE OSCILLATING PLATE AT SAID PRESSER FOOT IS VARIED IN ACCORDANCE WITH THE CONFIGURATION OF THE PATTERN APERTURE.