(57) The invention relates to an upper-and-lower feed sewing machine (100). The upper-and-lower
feed sewing machine (100) includes a feed dog (1) which feeds a lower workpiece (C1),
a feed foot (2) which feeds an upper workpiece (C2), a lower roller (3) moves the
lower workpiece (C1) in a direction intersecting a cloth feed direction, lower driving
means (4) for rotating the lower roller (3), an upper roller (7) which moves the upper
workpiece (C2) in the direction intersecting the cloth feed direction, upper driving
means (8) for rotating the upper roller (7), a separating plate (11) which holds the
lower workpiece (C1) and the upper workpiece (C2) in cooperation with the lower roller
(3) and the upper roller (7), detecting means (12) for detecting whether the workpieces
(C1, C2) are in respective positions, and a control means (13) for controlling the
respective driving means. The upper-and-lower feed sewing machine (100) further includes
lower pressing means (6) for pressing the lower roller (3) against the lower workpiece
(C1), and upper pressing means (10) for pressing the upper roller (7) against the
upper workpiece (C2). The control means (13) individually controls respective amounts
of current applied to the pressing means (6, 10).
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