MBM Corporation 307A (PERF & SCORING UNIT) - Manual (Page 6)

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(3) Setting Paper Transport Rollers, Upper and Lower, at proper position
Place the Paper Transport Roller where they can grip paper positively.
Firstly, loosen Lower Philips Fixing Screws on both sides. Slide and position
them to the appropriate location and fix them.
Then, loosen Thumb Screws of Upper Transport Rollers on both sides. Slide and
position them so that Upper Transport Rollers ride on the Lower Transport Rubber
Rings.
CAUTION ：
Depending location of perforating line, it may not always be possible to place
Upper Transport Roller riding on the two Rubber Rings. In this case, use single
Rubber Ring. However, as much as possible, try to use two Rubber Rings at both
sides for stable paper feeding.
CAUTION ：
Press Thumb Screw to Block Mounting Arm when fixing the Perforating Block.
This helps the paper to be fed straightly.
Upper Transport Roller
Lower Transport Roller Transport Rubber Rings
Thumb Screw
Roller Fixing
Screw
Block Mounting Arm
(1) Perforating at the center of a sheet
Place Blade Position Reference to 0 (Zero)
position of the scale
(Perforation Examples ) Blade Position Reference
Transportation
Shaft