Ricoh D391, Service Manual

Page: 395 / 490

The grip motor: front (M24) and grip motor: rear (M23) switch on and close the main gripper [1] to clamp
the signature tightly at the spine. Next, the sub grip motor (M20) turns on and opens the sub gripper [2]
to release the signature in the sub grip unit. After the signature is released by the sub grip unit [3], the sub
grip lift motor (M17) turns on and raises the sub grip unit about 5 mm away from the signature [4], then
returns the sub grip unit to its home position.
Main Grip Operation
The main grip unit [1] receives the signature from the sub grip unit [2], tamps the spine of the signature to
align it for gluing, lowers the signature onto the gluing unit for the application of glue to the spine, and then
passes the signature to the trimming unit.
Book Binding
393
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