the disclosed universal interface provides a simple but highly adjustable paper path transport that enables a wide range of variable pitch bridge - type interface interconnections between fixed pitch sheet processing machines . the highly flexible and adaptable interface units such as described in the present application eliminate substantial engineering time and work for separate specialized interfaces otherwise needed for interfacing particular hypermodular sheet processing arrays as well as for constructing single hypermodular sheet processing arrays which have the need for various reasons for a variable pitch portion interconnecting otherwise regularly spaced and sized sheet processing machines . the disclosed universal interface readily provides for a variable dimension or dimensions which may be substantially different from the pitch of the corresponding hypermodular sheet processing array in which it is connected . preferably , the nominal length of the universal interface is a fraction of the length of the associated hypermodular array pitch l . the interface is adjustable from a minimized length b , limited by the compressed length of the internal components of the module , to an expanded length l + b . any gaps in the hypermodular array beyond this range can be accommodated using a single universal module and an integer number of fixed pitch l modules . turning now to the figures wherein the showings are for purposes of illustrating the preferred embodiments only and not for limiting same , fig1 is a schematic side view of a sheet processing system 10 including a hypermodular sheet processing array 12 and intermediary universal interfaces 20 connecting a first sheet processing machine 30 with a second sheet processing machine 40 . the intermediary universal interfaces 20 include first and second universal interface modules 16 , 18 formed in accordance with preferred embodiments of the application . as shown , the first sheet processing machine 30 defines a first sheet path 32 extending between a sheet receiving end 34 of the processing machine 30 and a sheet discharging end 36 thereof . the paper path is illustrated as an arrow . the first sheet processing machine 30 is aligned with a first grid 38 defined by the hypermodular sheet processing array 12 which , in the embodiment illustrated , is two dimensional and rectangular . however , it is to be appreciated that the preferred embodiments are equally applicable to three dimensional arrays as well as to use between any pair of sheet processing machines . similarly , the sheet processing system 10 includes a second sheet processing machine 40 defining a second sheet path 42 extending therethrough from a second sheet receiving end 44 of the processing machine 40 to a second sheet discharging end 46 of the machine . as illustrated , the second sheet processing machine 40 is generally aligned with a portion of the hypermodular sheet processing array 12 , preferably having the form of a right angle turn module 48 . with continued reference to fig1 , the intermediary universal interfaces 20 are used to adapt the hypermodular sheet feed modules 48 , 50 for operative connection between the first and second sheet processing machines 30 , 40 . the first set of sheet feed modules 50 extend as a regular repeating block from the first sheet processing machine 30 for moving the sheets along a first portion of a continuous sheet path 22 connecting the first sheet path 32 of the first sheet processing machine 30 with a second sheet path 42 of the second sheet processing machine 40 via the right angle turn module 48 . the right angle turn module 48 is on the grid 38 of the first set of sheet feed modules and defines a second portion of the sheet path 22 extending between the first and second sheet processing machines 30 , 40 . it is to be appreciated that the first set of sheet feed modules 50 defines a rectangular grid 38 having a first pitch l x in a first horizontal direction and relative to the first and second sheet processing machines 30 , 40 . similarly , the sheet feed modules define a second pitch l y in a vertical direction and in the plane of the drawing sheet relative to the first and second sheet processing machines . as illustrated , the first and second pitches preferably have the same or an equivalent nominal size and the grid defines orthogonal axes . however , it is to be understood that the first and second pitches can have different lengths to form a rectangular grid and , further , the grid can define axes skewed in one or more dimensions to form a parallelogram grid . the universal interfaces 20 include a first universal interface module 16 disposed between the first and second set of sheet feed modules for accommodating a vertical pitch spacing difference l y ′ between the hypermodular sheet processing array 12 and the second sheet processing machine 40 . similarly , the second universal interface module 18 is provided in the system 10 for accommodating pitch spacing differences along a horizontal pitch direction l x ′ between the hypermodular sheet processing array 12 and the second sheet processing machine 40 . it is to be further emphasized that the sheet processing system 10 illustrated in the figure includes sheet feed modules having matching longitudinal and lateral pitches l x , l y , respectively for simplification and ease of description purposes . however , the respective pitches can be other than those shown . essentially , the universal interface modules of the preferred embodiments are useful to bridge variable distances between module inputs and outputs in horizontal , vertical , and combined horizontal and vertical directions between devices in hypermodular arrays . by utilizing the preferred interface modules described in the present application between inputs and / or outputs of functional units , the remainder of the paper path between the sheet processing machines 30 , 40 , and the like can utilize standard hypermodular sheet feed modules 50 , 52 , etc . disposed in a fixed pitch array as illustrated . more generally , the universal interface modules 16 , 18 comprising the universal interfaces 20 allow coupling between functional units which have arbitrary relative positions therebetween . to show the versatility of the subject embodiments , fig1 a illustrates a sheet processing system 10 ′ including the hypermodular sheet processing array 12 from fig1 , but using alternative intermediary universal interfaces 20 ′ connecting the first sheet processing machine 30 with the second sheet processing machine 40 . the intermediary universal interfaces include first and second universal interface modules 16 ′, 18 ′ formed in accordance with further embodiments of the present application . in fig1 a , the second machine 40 is moved relative to the first machine 30 based on the initial arrangement shown schematically in fig1 . in the embodiment shown schematically in fig1 a , each of the universal interface modules 16 ′, 18 ′ are movable in both horizontal and vertical directions to form a parallelogram of selected dimensions . this accommodates the potential need in the art to provide for several processing machines being located off of one or more of the grid axes . to the above end , and with reference next to fig2 , the preferred form of the subject universal interface is a telescopic universal interface module 60 movable between the positions illustrated in fig2 and 3 in horizontal or vertical directions relative to the sheet processing system 10 described above . the telescopic universal interface module 60 embodiment illustrated , however , provides a single degree of freedom in a horizontal direction in terms of the sheet processing system for adaptive connection between devices arranged in corresponding hypermodular sheet processing arrays . fig3 shows the module 60 extended to a length comparable to or slightly greater than the horizontal pitch l x . fig2 shows the module 60 collapsed to a fraction of the pitch l x less than the fraction of l x shown in fig3 . in its preferred form , the telescopic universal interface module 60 includes a frame 62 and a universal interface module 64 providing a sheet feeding path 66 positional relative to the frame 62 therethrough . the sheet feeding path 66 extends from one side of the module to the other as illustrated . more particularly , the sheet feeding path extends between a sheet receiving sheet path end 70 of the sheet feeding path 66 to a sheet discharging sheet path end 72 of the sheet feeding path 66 . as understood by those skilled in the art , the sheet feeding path 66 is provided for transporting copy sheets output from an associated first sheet processing machine to an associated copy sheet input of a second sheet processing machine in a direction a marked in the figure . fig2 a shows an alternative preferred form of the subject universal interface module 60 ′ movable between the positions illustrated in fig2 a and 3 in horizontal or vertical directions relative to the sheet processing system 10 described above . the telescopic universal interface module 60 ′ embodiment illustrated in fig2 a provides a bidirectional paper feed path therethrough and , in that regard , offers alternative functionality relative to the first embodiment illustrated in fig2 . as in fig2 , the bidirectional universal interface module 60 ′ extends a length comparable to or slightly greater than the horizontal pitch l x . fig2 a shows the bidirectional module 60 ′ collapsed to a fraction of the pitch l x less than the fraction of l x shown in fig3 . in the form illustrated , the bidirectional telescopic universal interface module 60 ′ includes a frame 62 ′ and a universal interface module 64 ′ providing a bidirectional sheet feeding path 66 ′ positional relative to the frame 62 ′ therethrough . the bidirectional sheet feeding path 66 ′ extends between opposite sides of the module as illustrated . more particularly , the bidirectional sheet feeding path extends between a sheet receiving / discharging sheet feed path end 70 ′ of the sheet feeding path 66 ′ to a sheet receiving / discharging sheet feed path end 72 ′ of the sheet feeding path 66 ′. as understood by those skilled in the art , the bidirectional sheet feeding path 66 ′ is provided for transporting copy sheets between the associated first and second sheet processing machines in directions b marked in the figure . the bidirectional telescopic universal interface module 60 ′ includes additional sheet feeding guides 71 , 73 at opposite sides of the bidirectional sheet feeding path 66 ′. the additional sheet guides 71 , 73 are provided to enable jam - free transfer of sheets across the module boundaries . in their preferred form , the additional guides are formed so as to be cooperative with similar guides on like modules for joining in an interdigitated fashion as understood by those skilled in the art . the interdigitated additional sheet feed guides enable smooth transition and transfer of sheets across the module boundaries . with continued references to fig2 and 3 , the sheet discharging sheet path end 72 of the sheet feeding path 66 is independently positionable relative to the sheet receiving sheet path end over a range which extends from the position illustrated in fig2 to the position illustrated in fig3 . essentially , the sheet discharging end is telescoped relative to the sheet receiving end from the orientation shown in fig2 in a single degree of freedom to the configuration shown in fig3 . a positioning system 80 includes a set of linkages 82 for holding a pair of opposed tambour devices 84 , 86 on opposite sides of the sheet feeding path 66 . in their preferred form , the tambour devices 84 , 86 are anchored at opposite ends 88 , 90 and 92 , 94 , respectively to form rolls or the like . it is to be appreciated that devices or mechanisms other than the tambour devices illustrated can be used to define the sheet feeding path 66 including but not limited to any form of telescoping walls , stretchable membrane walls and the like . in the preferred form illustrated , the linkage 82 include first and second parallel telescoping struts 100 , 102 connected at opposite ends to the ends of the tambour devices 94 , 96 . the struts 100 , 102 are connected to the frame 62 at first ends 104 , 106 , thereof as well as at second ends 108 , 110 to thereby form a parallelogram . in that way , the struts 100 , 102 form a cantilever by support at their first ends 104 , 106 . a pair of opposed rollers 120 , 122 define a nip 124 at the receiving end 70 of the sheet feed path 66 . the rollers are motivated by an operatively associated motor , linkage , and controller system ( not shown ) for moving sheets along the path in the direction a . it is to be appreciated that the nip can be located in the universal interface module or in the adjacent hypermodule as desired . preferably , however , the nip center line is placed at or is arranged to be coincident with the module boundary in accordance with the present embodiments . in addition to the above , a first pair of paper guides 120 are carried in association with the rollers and the struts for guiding the work sheets through the nip and between the tambour devices 84 , 86 along the paper path . similarly , a pair of exit paper guides are provided to ensure that the copy sheets exit the paper path in the desired direction . with reference next to fig4 , a universal interface module 160 formed in accordance with a second embodiment of the application is illustrated . as shown there , the module 160 is telescopic in two degrees of freedom in both horizontal and vertical directions in terms of the sheet processing system for adaptive connection between devices arranged in corresponding hypermodular sheet processing arrays . in its preferred form , the telescopic universal interface module 160 includes a frame 162 and a universal interface module 164 providing a sheet feeding path 166 positional relative to the frame 162 therethrough . the sheet feeding path 166 extends from one side of the module to the other as illustrated . more particularly , the sheet feeding path extends between a sheet receiving sheet path end 170 of the sheet feeding path 166 to a sheet discharging sheet path end 172 of the sheet feeding path 166 . as understood by those skilled in the art , the sheet feeding path 166 is provided for transporting copy sheets output from an associated first sheet processing machine to an associated copy sheet input of a second sheet processing machine in a direction a marked in the figure . with continued reference to fig4 , the sheet discharging sheet path end 172 of the sheet feeding path 166 is independently positionable relative to the sheet receiving sheet path end over a range which extends from the position illustrated in fig2 to the position illustrated in fig4 . essentially , the sheet discharging end is telescoped relative to the sheet receiving end from the orientation shown in fig2 in two single degrees of freedom to the orientation shown in fig4 . a positioning system 180 includes a set of linkages 182 for holding a pair of opposed tambour devices 184 , 186 on opposite sides of the sheet feeding path 166 . in their preferred form , the tambour devices 184 , 186 are anchored at opposite ends 188 , 190 and 192 , 194 , respectively to form rolls or the like . other structures can be used as well such as interdigitized plastic or metal walls , elastic membranes , etc . also , the tambour devices can be formed of metal , plastic , or any other suitable material as desired . in the preferred form illustrated , the linkage 182 includes first and second parallel telescoping struts 200 , 202 connected at opposite ends to the ends of the tambour devices 194 , 196 . the struts 200 , 202 are connected to the frame 162 at first ends 204 , 206 , thereof as well as at second ends 208 , 210 to thereby form a parallelogram . in that way , the struts 200 , 202 form a cantilever by support at their first ends 204 , 206 . a pair of opposed rollers 210 , 212 define a nip 214 at the receiving end 170 of the sheet feed path 166 . the rollers are motivated by an operatively associated motor , linkage , and controller ( not shown ) for moving sheets along the path in the direction a . in addition to the above , a first pair of paper guides 220 are carried in association with the rollers and the struts for guiding the work sheets through the nip and between the tambour devices 184 , 186 along the paper path . similarly , a pair of exit paper guides 224 are provided to ensure that the copy sheets exit the paper path in the desired direction . it will be appreciated that various of the above - disclosed and other features and functions , or alternatives thereof , may be desirably combined into many other different systems or applications . also that various presently unforeseen or unanticipated alternatives , modifications , variations or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims .