preparatory device is set standby by a pedal action to wait for the start signal from the main sewing mechanism through some transmission system in the meantime the preparatory device remains pressing the suit fabric d with the press 3 at the backward position the suit fabric d will be slid forward on the work surface a to the position as shown in fig5 see the next step 4 4 when the main station permits the base presses c c to move forward as a previous cycle and immediately the t shaped press f starts moving upward then the signal is transmitted to the preparatory side whereby the preparatory device 2 starts moving forward during a sewing cycle blow pipes 9 are actuated if equipped as noted before 5 the base presses c c release the sewn cloth materials at the most forward point and move to a height for the starting position 6 from above the starting position where the next fabric is already set pressed by the preparatory press 3 the preparatory device has reached the forward position which corresponds to the left hand side in the square s the base presses c c come down to land striding the press 3 aground whereby the.