the following descriptions are of exemplary embodiments only , and are not intended to limit the scope , applicability or configuration of the invention in any way . rather , the following description provides a convenient illustration for implementing exemplary embodiments of the invention . various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims . referring to fig1 and 2 , there is shown a positioning peg structure of a single - pull reel comprising a top cover 1 , a spiral spring 2 , a cord 3 , a cord - rotating disc 4 , a bottom cover 5 and a peg positioning structure 6 . the center end of the spiral spring 2 is in engagement with the engaging slot 52 of the center shaft 51 within the interior of the bottom cover 5 . further , the outer end of the spiral spring 2 is secured to the engaging slot 41 of the cord - rotating disc 4 by means of an edge hook 21 . when the cord - rotating disc 4 is rotated in clockwise or counter - clockwise , the spiral spring 2 at the interior is urged to be tightened or loosen . this provides the essential power source of rotating or restoration of the cord . the edge wall of the cord rotating disc 4 is provided with an engaging plate 42 which causes the cord 3 to surround the upper box of the cord - rotating disc 4 . when the cord 3 passes through the external edge of the lower box of the cord - rotating disc 4 , the cord 3 is divided into an upper and lower box position . the upper box is for the pulling cord 3 and the lower box is for the ready - to - rotate cord 3 . in accordance with the present invention , the characteristics are on the cord - rotating disc 4 and the peg positioning structure at the external side of the interior of the bottom cover 5 . as shown in fig2 , the peg positioning structure 6 comprises a peg 61 and a pulling spring 62 . the peg 61 is pivotally mounted to the positioning shaft 53 at the external side of the interior of the bottom cover 5 , and the pulling spring 62 is used for fastening such that the peg 61 is constantly pointing to the correct direction . as shown in fig3 , the bottom section of the cord - rotating disc 4 is provided with a multi - operation urging track 43 . the track 43 includes a first push to close section 431 , a second push to close section 431 - 1 , a steering section 432 , an engaging slot 433 and a slanting leading face 434 . as shown in fig3 , the peg 61 is at a large angle position and slanting upward and moving along the rotating direction will not generate an engaging operation . thus , the peg 61 shown in the figure is being pulled . referring to fig4 , when the reel is releasing , the spiral spring 2 restores to its power and the cord - rotating disc rotates in a counter clockwise direction . at this point of time , the peg 61 is directed to the engaging slot 433 such that a positioning is provided to the reel . the positioning is referring to the engagement of cord at a tangential angle , the positioning shaft 53 and the peg 61 . the peg 61 is fully engaged and swinging will not occur , and therefore , the positioning of the reel is achieved . as shown in fig6 , when disengagement from the peg 61 is to be obtained , the cord at the reel is pulled again , and the cord - rotating disc 4 rotates in counter clockwise direction , as compared to the urging track 43 and the peg 61 . the reverse rotating of the cord - rotating disc 4 causes the peg 61 to move along the slanting leading face 434 into the range of the push to close section 431 so as to quickly push the peg 61 to rotate , as shown in fig6 . after that , the second push to close section 431 - 1 causes the peg 61 to produce a large angle and moves into the range of the steering section 432 , as shown in fig7 . at this point of time , the reel is at a loosening state . thus , the cord 3 can one time pulls back the cord 3 being pulled by means of the spiral spring . referring to fig8 , the cord 3 is eventually reeling back or re - positioned . before the cord 3 is positioned , the next pulling of the cord 3 will again rotate the cord - rotating disc 4 in a reverse direction . at this point of time , the peg 61 being restricted by the steering section 432 urging on the peg 61 , the peg 61 is at a state shown in fig3 and 4 , awaiting the reverse rotating to cause an engagement at the engaging slot 433 . the ready - to - rotate cord 3 at the bottom box of the cord - rotating disc 4 is at a tightening state under a single directional pulling of the cord 3 , so as to respond to the required length of the rotation . on the other hand , when the cord 3 is restored to its original position , the ready - to - rotate cord at the bottom box is at a loosening position , thus , both of the operation are corresponding to each other . thus , the reel under a single cord could achieve the function a single - pull cord , and will not affect the terminal or signal transmission point required by the ready - to - rotate cord end 31 . it will be understood that each of the elements described above , or two or more together may also find a useful application in other types of methods differing from the type described above . while certain novel features of this invention have been shown and described and are pointed out in the annexed claim , it is not intended to be limited to the details above , since it will be understood that various omissions , modifications , substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention .