Sewing machine having a means for setting a sewing working device to a predetermined optimum set value

A sewing machine capable of setting working means for sewing to have a predetermined set value by electrical means and capable of selecting plural types of stitches, comprising:

• a first storage section, functioning as an unrewritable storage memory, for storing an initial set value of the working means for each of the stitch types;
• a second storage section, functioning as a rewritable-nonvolatile memoty, for storing, as a regulated set value, the initial set value read from the first storage section;
• a third storage section, functioning as a rewritable memory, for storing the regulated set value read from the second storage section as a driving set value;
• initial value changing means for changing a part or all of the initial set values read from the first storage section and storing them as the regulated set values in the second storage section;
• normal setting means for changing a part or all of the regulated set values read from the second storage section and storing them as the driving set values in the third storage section;
• and
• display means capable of displaying the regulated set value and the driving set value.

A sewing machine capable of setting working means for sewing to have a predetermined set value by electrical means and capable of selecting plural types of stitches, comprising:

• a ROM (Read Only Memory) for storing an initial set value which is previously optimized as the set value of the working means in a stage of tests;
• a rewritable nonvolatile memory for storing, as a regulated set value, the initial set value read from the ROM;
• a RAM (Random Access Memory) for storing, as a driving set value, the regulated set value read from the nonvolatile memory;
• initial value changing means for changing a part or all of the initial set values read from the ROM and storing them as the regulated set values in the nonvolatile memory;
• normal means for changing a part or all of the regulated set values read from the nonvolatile memory and storing them as the driving set values in the RAM;
• and
• display means capable of displaying set value data in the nonvolatile memory and the RAM.