since the xerographic reproducing process is well known , a detailed description thereof is omitted . for those who would consider a description of a xerographic process necessary for a complete understanding of the present invention , reference may be had to u . s . pat . nos . 3 , 718 , 116 , 3 , 745 , 972 and 3 , 861 , 860 which patents are incorporated herein by reference . as shown in fig1 the present invention comprises a fuser roll assembly 15 including a heated roll structure 30 including a hollow cylinder or core 31 having a suitable heating element 32 disposed in the hollow portion thereof and which is coextensive with the longitudinal axis of said cylinder or core . the core 31 has provided on the outer surface thereof a layer of silicone rubber 34 or other suitable material which has adhesive characteristics , therefore , tendency to release toner type contaminants therefrom . the heating element 32 may comprise a suitable type heater for elevating the surface of the silicone rubber layer to operational temperatures , therefore , temperatures on the order of 250 ° to 450 ° f . for example , the heating element may comprise a quartz lamp . the cylinder or core 31 is fabricated from any thermally conductive material , for example , steel , aluminum , or alloys thereof . the resulting structure has an outside diameter on the order of 1 . 5 to 3 . 0 inches and a length on the order of 10 to 15 inches . power requirements for the foregoing are 500 - 2500 watts , peak power with an average power 300 - 2000 watts and 75 - 250 watts for standby . the surface temperature of the fuser roll structure is controlled by contacting the surface thereof with a thermistor probe 36 in a manner described in u . s . pat . no . 3 , 327 , 096 , issued in 1967 to bernous and incorporated herein by reference . to this end , the end of the roll contacted by the thermistor probe 36 may be specifically designed to accommodate such control of the operating temperature . in other words , means may be provided to reduce friction between the probe 36 and the surface of the fuser roll structure . one method of accomplishing the foregoing would be to manufacture the fuser roll structure 30 such that the end thereof contacted by the probe 36 is devoid of silicone rubber material whereby the probe contacts the core and the set point of the thermistor is adjusted accordingly . the fuser assembly 15 further comprises a backup roll structure 38 which cooperates with the fuser roll structure to form a nip 40 through which copy paper or substrate material 42 passes such that toner images 44 thereon contact the surface of the fuser roll structure 30 . the backup roll structure may comprise any suitable construction for example , a steel cylinder , but preferably comprises a rigid steel core 46 having a viton elastomer surface or layer 48 which as can be observed has a relatively large thickness in order to provide a soft member which can be indented by the fuser roll structure 30 in order to form the nip 40 . after the copy sheet or substrate material 42 passes through the nip 40 it tends to stick or adhere to the surface of the fuser roll structure 30 . accordingly , stripper finger structure 50 is provided for stripping the copy sheet or substrate material from the surface of the fuser roll structure 30 so that the copy sheets can continue on their intended path of movement toward the exit of the copier apparatus . as noted hereinbefore , as the copy sheets 42 pass through the nip 40 in contact with the surface of the fuser roll structure 30 and the backup roll structure 38 contaminants are offset onto the surface of the fuser roll structure 30 . because the surface of the fuser roll structure 30 comprises the aforementioned silicone rubber which constitutes an adhesive material , the contaminants can be readily removed from the fuser roll structure 30 . also noted above was the fact that tacky surfaced cleaning rolls such as cleaning roll structure 54 shown in its operative position ( i . e . engaged with the fuser roll structure 30 ) for removing contaminants such as toner and paper fiber from fuser roll structures are well known . in its inoperative position the roll structure 54 is moved out of engagement from the fuser roll structure . one form of such a cleaning roll structure comprises a sleeve carried by a core member which is , in turn , rotatingly supported by means of a shaft , the ends of which are supported by end plates ( not shown ) of a support mechanism 62 . a cleaning structure of this type is disclosed in u . s . pat . no . 3 , 861 , 860 issued in the name of thettu and incorporated herein by reference . as described in the foregoing patent , the sleeve is provided with a polymer material which is tacky at the operating temperature of the fuser roll structure . the polymer material preferably comprises a material selected from the group of aliphatic , aromatic or mixtures of aliphatic , aromatic polyesters which have a melting or softening point ranging from about 120 ° to about 275 ° c . consequently , the polymer provides an effective mechanism for removing the contaminants 52 from the surface of the fuser roll structure 30 . the cleaning roll structure 54 comprises a sleeve 56 which is provided with a polymer material which is tacky at the operating temperature of the fuser roll structure . the polymer material forms a layer 58 on the outer surface of the roll structure 54 . a heater 80 is provided internally of said cleaning roll structure for softening the polymer material . in operation , the toner and other contaminants removed from the fuser roll structure become embedded in the outer layer 58 and during certain modes of operation ( i . e . short copy runs ) the contaminants are worked into the layer of polymer material and are mixed adequately therewith . however , during certain other modes of operation ( i . e . longer copy runs ) a much greater quantity of contaminants must be handled , and therefore , there isn &# 39 ; t sufficient time to become mixed into the polymer layer of the cleaning roll structure 54 . accordingly , a combination mixing and adhesive supply roll structure 60 is provided for obviating this condition . the mixing adhesive supply roll 60 comprise a metal core 62 covered with a tacky polymeric layer 64 . by the provision of the roll structure 60 and its tacky polymer layer 64 , a cross mixing of contaminants and polymer material between the cleaning roll and the roll structure 60 results which tends to obviate the condition where the toner contaminant transfer rate from fuser roll structure to the cleaning roll structure is greater than the rate at which the contaminants can become embedded in the polymer layer on the cleaning roll structure . a roll structure 66 comprising a core 68 and an elastomeric surface or outer coating 70 is provided for smoothing irregularities on the roll structure 60 to thereby prevent damage occurring to the cleaning roll structure by sharp edges formed on the roll structure 60 . the support structure 62 is pivotably supported as indicated at 72 and can therefore be pivoted clockwise to remove the cleaning roll structure from engagement with the fuser roll structure and then in a counterclockwise direction to effect engagement therebetween . a spring 74 provides a simple bias means for maintaining proper engagement of the cleaning roll structure and the fuser roll structure . the rolls 54 , 60 and 66 are sequentially engaged during operation as illustrated in the drawings . the sequential engagement is achieved by cam mechanism which is essential for smooth operation of the system . in the engagement sequence the cleaning roll 54 contacts heated fuser roll 30 initially which is followed by supply and mixing roll 60 contacting cleaning roll 54 and finally smoothing roll 66 contacts supply and mixing roll . individual cam and follower ( not shown ) pairs which may be solenoid actuated are provided for effecting engagement of the rolls 54 and 60 in the sequence described . however , it is desirable that all of the rolls be disengaged from each other during inoperative periods . accordingly , disengagement means ( not shown ) in the form of conventional cams and cam followers may be employed for such purposes in accordance with skills known in the art . a supply of thermal energy , for example , a cal rod heater 65 having a capacity on the order of 25 - 30 watts is provided internally of the structure 60 . the roll structure 66 is also provided internally thereof with a source of thermal energy 67 . the sources of energy 65 and 67 assist in maintaining the tacky polymer on the roll structures 54 and 60 in a softened condition . optionally , the roll structures 54 and 60 are driven separately with overriding clutches to reduce the drive torque on the fuser roll member during the mixing mode . a modified form of the invention as illustrated in fig2 is identical to the structure disclosed in fig1 with the exception that the roll structure 66 is held in contact with the heated fuser roll structure during operation which thereby renders unnecessry the employment of an internal heat source for such roll structure . in the modified form of the invention embodiment the engagement sequence is slightly modified by allowing the smoothing roll and cleaning roll contacting the fuser roll simultaneously or first and second respectively . the mixing and supply roll next makes contact with smoothing roll prior to contacting the cleaning roll . while the invention has been disclosed in conjunction with the preferred embodiments of the invention , modifications thereto within the scope of the invention will become apparent to those skilled in the art and such modifications are intended to be covered by the claims appended hereto .