all elements are properly aligned the operator pushes the foot pedal to a second position which triggers or actuates the pneumatic cylinder 32 to clamp the top jaw 38 against the bottom jaw 40 as the elongated u shaped member 24 moves down into a clamping position a micro switch 56 fig1 is actuated the actuation thereof in turn causes the arm means 60 and 62 to move into the position as shown in fig3 and the preliminary clamp 50 to return to its neutral position as shown for example in fig1 the action of the arm means 60 and 62 is employed to trigger a second micro switch means 58 at a point just prior to their maximum spread distance this point coming after the preliminary clamp and more specifically the high friction fabric engaging portion 48 has cleared the aperture 122 the actuation of the micro switch means 58 in turn triggers or initiates the beginning of the predetermined sewing cycle whereby a sewing pattern such as that shown in fig9 is achieved during the time that this sewing cycle is taking place the operator can be manually arranging the strap portion of the other end of the same brassiere portion for the attachment thereto of a hook portion such as that shown in fig8 upon completion of the sewing cycle the logic system of the programmable sewing machine actuates the pneumatic cylinder 32.