Abstract: A sheet folder apparatus for use with a web-fed printing press includes upstream and downstream folding assemblies and a conveyor for delivering cross-folded sheets from the upstream assembly to the downstream assembly. A head stop is positioned within the delivery path defined by the conveyor for limiting the movement of the cross-folded sheet along the path and for positioning the sheet relative to the downstream folding assembly. The position of the head stop along the delivery path may be adjusted during operation of the apparatus so that it is not necessary to shut the apparatus down to make adjustments to accommodate various signature size and format changes in the apparatus. A registration system is also included for registering the two folding assemblies relative to the apparatus when either the upstream assembly is replaced or the downstream assembly is enabled.

Abstract: The squeeze of two opposed paper-receiving rolls of an offset printing press may be infinitely adjusted within a relatively small range by virtue of the fact that each end plate supporting the rolls has a slit therein between the axes of rotation of the rolls which will permit slight deformation of the plate in a direction transversely of the slit upon manipulation of an adjusting mechanism to shift the rolls toward and away from each other. Adjustment mechanism is provided on each plate and includes a cam that, when rotated by the longitudinal displacement of an operating link, has the effect of opening or closing a corresponding slit to thereby effect minute adjustment of the spatial relationship of the roll axes. The operating link has a specially threaded section from which the longitudinal displacement of the link is derived, the arrangement being such that the ratio of link rotation to link displacement is relatively high so that very fine adjustment of the critical roll relationship can be achieved.

Abstract: In an offset printing press the inker is normally clamped down against the printing section so as to transfer ink from the form roll of the inker to the plate cylinder of the printing section, but upon actuation of an air cylinder to extend the rod thereof, a clamping jaw on the outer end of the rod releases its grip on a latch lever and pushes against the frame of the printing section, thereby incrementally raising the inker and effecting slight separation of the form roll and plate cylinder. Such slight separation is not, however, sufficient to disengage drive mechanism associated with the form roll and plate cylinder so that the form roll may continue to rotate notwithstanding the slight separation.