it will be further understood that linked chain 145 engages a similar sprocket wheel 144 on the opposite end of the machine which causes a corresponding upwardly or downwardly movement to occur in back up roll 123 in this manner equal pressures are applied to both ends of the back up roll to maintain a uniform pressure across the surface of die cutting roll 6 fig1 illustrates cutter stripper 146 which is designed to remove a small portion of the resilient mat 124 of back up roll 123 when the mat is no longer usable because of excessive wear cutter stripper 146 comprises a rectangular shaped support bar 147 which is supported above and parallel to back up roll 123 a block like carriage 148 contains a rectangular shaped aperature which engages support bar 147 such that block 148 is free to slide therealong a cutting tool 149 is attached to the front surface of block 149 and contains a suitable cutting edge 150 designed to produce the proper stripping of resilient mat 124 tool 149 may be adjusted vertically by clamp plate 151 to remove the proper amount of mat 124 cutter stripper block 148 is moved along support bar 147 by means of lead screw 156 which engages a threaded aperature 152 extending longitudinally through the upper portion of block 148 a spur gear 153 is connected to one end of lead screw 156 and is driven from a similar gear 154 attached to electric.