107 207 and the piston rods 122a 222a of the air cylinders 122 222 are also extended in this process as a result the auxiliary guides 110 210 may be lifted up together with the presser foot so that the operator may easily guide the hem edges c0 d0 beneath the cloth guides 107 207 and move the side edges c d near the hem edges c0 d0 to abut against the edges 106a 206a of the guides 106 206 in this case the presser feet and the auxiliary guides 110 210 may be designed to descend in several seconds after receiving a cloth detection signal from the cloth sensor 125 for sensing the presence of the cloth as the body cloth w1 is set at the specified position furthermore when it is designed to drive the sewing machines 100 200 simultaneously in several seconds after the presser feet and auxiliary guides 110 210 descend to touch the body cloth w1 sewing of the side edges c d will be automatically started only by setting the body cloth w1 at a specified position in this way sewing of the side edges c d is done simultaneously at the same speed at this time in the sewing machines the auxiliary guides 110 210 contact the body cloth w1 outside the sewing lines 104.