as was mentioned above , the present invention is concerned with an improved fold roll for use on folders that are used in the production of tabloid size newspapers . in the past , when changing from one size paper to another , it has been necessary to shut down the apparatus and completely remove the second fold roll so that the distance between the margin rings could be changed . the present invention overcomes this difficulty by providing a second fold roll having an improved construction . specifically , the roll is so shaped as to accommodate two semicylindrical portions that can be quickly removed and exchanged for similar semicylindrical portions on which the margin ring is located at some different longitudinal location along the axis of the base roller . for a better understanding of the invention , reference is made to the drawings , and specifically to fig1 wherein the numeral 10 indicates the general overall improved roller construction . the roller 10 is comprised of an elongated roll 11 which has an intermediate body portion 12 that is of a diameter that is larger than the diameter than any other section of the roll 11 . the intermediate body portion 12 has a knurled or roughened margin ring 13 formed integrally on one end thereof , the margin ring rising above the surface of the remainder of the intermediate portion 12 so that only the exposed outer surface of margin ring 13 will grip the edges of a newspaper as it is being fed through the folding apparatus . by referring to fig9 and 10 of the drawings , it can be seen that the intermediate portion 12 includes a section of reduced diameter 14 formed on that end of the intermediate body which is opposite the margin ring 13 . the function of the reduced section 14 is to accommodate the reception of a pair of semicylindrical inserts 15 and 16 onto the intermediate section of reduced diameter . each of the semicylindrical inserts has formed on its surface a margin ring 17 which when the two halves 15 and 16 are assembled on the intermediate portion 12 of roll 11 , will form a circular knurled margin ring on the righthand side of the roller . it may be noted at this time that the purpose of the invention is to provide a means whereby the distance between the cooperating and opposed margin rings can be expeditously changed to accommodate different widths of tabloid newspapers . this is accomplished by loosening one set of semicylindrical inserts and replacing them with another set in which the margin rings are located at a different position along the longitudinal axis of roll 11 . for example , a new pair of inserts could be inserted in which the margin ring would be located at the phantom position identified by the numeral 20 in fig1 of the drawings . means are provided whereby the semicylindrical inserts 15 and 16 can be retained on the portion of reduced diameter 14 . broadly , these means comprise elongated means or elements that are mounted within longitudinally extending slots found in the main intermediate body portion 12 of roll 11 and adjustable means that is mounted on the elongated roll to move the elongated elements parallel to the axis of the roll shaft and thereby effect clamping and release of the inserts depending upon the direction of movement of the elongated means . more specifically , there are located at substantially diametrically opposite positions on the intermediate body portion 12 a pressure strip 25 and a bar clamp 26 . the pressure strip 25 can be seen clearly in fig1 and the bar clamp 26 can be indentified most clearly in fig3 and 5 which are sectional views through the roll . as these latter figures show , most clearly , the pressure bar 25 and bar clamp 26 are received into appropriately milled recesses within the roller 11 . also , referring to fig4 and 5 , it can be seen that the upper or outer surface of the pressure bar 25 extends outwardly into an imaginary cylinder that would also contain the outermost surfaces of the margin rings . the pressure bar 25 and bar clamp 26 are constructed in substantially the same fashion , with the exception that the outer surface of the bar clamp terminates substantially coterminous with the surface 12 of the main body portion . each of these elements is formed with spiral threads on the lefthand end as viewed in fig1 , 9 , and 10 . as shown in section in fig9 and 10 , the external threads 28 on the pressure bar 25 and bar clamp 26 are threadably engaged with the internal threads 29 of locking ring 27 . the opposite ends of each of the elements 25 and 26 terminate in an upwardly extending flange 30 that abuts a right end locking ring 31 . internally threaded locking ring 27 is abutted by an intermediate spacer ring 30 that in turn is abutted by a clamp ring 35 . collar clamp ring 35 includes tightening means , here shown as a bolt and nut combination 36 that is used to tighten against the spacer ring 30 and hold the locking ring 27 in its adjusted position . the clamping ring 35 is secured directly to the roll shaft by means of threaded fasteners 37 shown in the cross sectional view of fig2 . in operation , when it is desired to change a set of semicylindrical inserts 15 and 16 to provide other inserts with the margin ring located at a different site , the fasteners 37 are loosened so that the clamp collar 35 can be moved backwardly along with spacer 30 . this having been done , then the locking ring 27 is turned forcing the pressure bar 25 and bar clamp 26 toward the righthand side of the drawings and thereby permitting locking ring 31 to be moved to the right and clear the end of the semicylindrical inserts . with this accomplished , the operator need only remove both of the sections and install the insert that is desired to be used . with the new inserts in position , the reverse of the operation described above is effected and the new inserts are ready for operation . whereas in the past , it has required approximately a day &# 39 ; s time to effect change in a second fold roll of the type discussed here , it is possible with this invention to effect a changeover from one size tabloid to the other in no more than fifteen minutes . although the present invention has been described in connection with the preferred embodiments , it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention , as those skilled in the art will readily understand . such modifications and variations are considered to be within the purview and scope of the invention in the appended claims .