the contact surfaces if the outer hoop is transversely slotted and its ends are connected by a turnbuckle symmetrical expansion of the outer hoop independently of the thickness of the fabric to be embroidered will be achieved due to the fact that the turnbuckle is arranged in the axis of symmetry of the contact surface at the bow spring of one holder and the contact surface or contact surfaces of the opposite holder application_number US 48828890 A description the long beams of the work carrier 80 of an embroidering machine 81 see fig8 which can be moved relative to the embroidery heads 82 by e g stepper motors 83 84 in two directions that are at right angles to one another x and y directions corresponding to the embroidery pattern to be produced are designated by reference numeral 1 as is known generally for example from u s pat no 4 444 133 the stepper motor 83 for the movement of the work carrier 80 in the 34 x 34 direction includes a gear 85 stepper motor 84 for the movement of the work carrier 81 in the 34 y 34 direction includes a gear 86 these drive a gear belt 87 and 88 respectively which carry clutch mechanisms generally designated 89 the clutch mechanisms 89 are engageable with the work carrier 80 for shifting it along the x and y coordinates as indicated in fig1 and 8 each clutch mechanism 89 includes a roller 90 as engagement means which engages a guide rail 91 92 of the work carrier 80 respectively upon actuation of the clutch mechanism the rotary movements of the stepper motor 83 in two.