American modified boleras. Consists of: a framework formed by vertical side sheets (1) united by one folded plate (2) and two angular profiles (3); a motor-reducer (4) that transmits movement to a pulley (5) located in an axis; a toothed wheel (7) that transmits movement to a second wheel (9) supported on the axle (10) by an axis (10); a wheels (11) are placed on the axis (10) and transmit movement to driven wheels (13) which are supported in a support (14) by two parallel plates for a chains (12) attached by tensioning wheels (15); a movable roller (16) that stretches the strings (17) of which the bolos are subject (18); a micror switch (19) that controls the roller displacement (16). (Machine-translation by Google Translate, not legally binding)
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