Four identical pulleys 1, 2, 3 and 4 rotate about fixed axes B, D, C and A. Flexible link 5 runs over pulleys 1 and 4; flexible link 6 runs over pulleys 2 and 3. When pulleys 1 and 4 rotate clockwise, and pulleys 2 and 3 counterclockwise, flexible links 5 and 6 grip strip 7 and feed it to the left.
$3499$SFL,ML$