Digital override control of bight and feed in a sewing machine

A sewing machine comprising:

• stitch forming instrumentalities positionally controlled over a predetermined range between stitches to produce a pattern of feed and bight controlled stitches;
• static memory means for storing pattern stitch information;
• pattern selection means including an address memory and responsive to operator pattern selection for providing a static memory means address corresponding to the selected pattern;
• means operating in timed relation with said sewing machine for recovering selected pattern stitch information from said static memory means;
• separate actuating means responsive to said pattern stitch information for influencing the feed and bight motions respectively to produce a pattern of stitches corresponding to the selected pattern stitch information;
• separate controllable bight and feed alteration means effective to alter the operation of the feed and bight actuating means respectively to an amount of motion different from that dictated by said pattern stitch information;
• bight override memory means for storing bight actuating means motion reduction values in addressable memory locations;
• first operator controlled means for providing a bight override memory address signal corresponding to a desired bight reduction value;
• first means utilizing said bight override memory address signal for retrieving from said bight override memory means said desired bight reduction value;
• first converting means for converting said desired bight reduction value into a first control signal for rendering effective said bight alteration means;
• feed override memory means for storing feed actuating means motion alteration values in addressable memory locations including;
• a first feed override memory including a plurality of tables of feed alteration values, said pattern selection address memory further storing which of said tables corresponds to each of the patterns;
• a second feed override memory storing fixed forced feed information in a plurality of addressable locations, said pattern selection address memory further storing one of the fixed forced feed memory addresses for each of the stored patterns;
• second operator controlled means for providing a feed override memory address signal corresponding to a desired feed alteration value;
• second means utilizing said feed override memory address signal and the information stored in said pattern selection address memory corresponding to the selected pattern for retrieving from said feed override memory means the desired feed alteration value from one of said tables in said first feed override memory and the fixed forced feed information from said second feed override memory;
• means for substituting said fixed forced feed information for the stored pattern feed information;
• and
• second converting means for cnverting the desired feed alteration value into a second control signal for rendering effective said feed alteration means.