Rural planning, the community and large livestock facilities: A cross-Canada survey

The grippers on a sheet feeding apparatus from a printing machine are controlled by having a follower contacting the leading cam formed as a parallelogram - shiftable track, suspended on leading and trailing swing arms of equal length, having one end each pivotable about leading and trailing points, the shiftable track being arranged at shallow angle with respect to the center of the chain conveyer; and a trailing cam, formed as a swingable segmental-like element swinging about a pivot point and having a leading edge thereof located approximately in the prolongation of a line connecting the pivot point thereof and the suspension point of the trailing swing arm of the shiftable track. The trailing cam means being formed to have a leading edge outline which matches substantially with the trailing edge outline of the leading cam, so that the gripper control follower will be smoothly engaged by both leading and trailing cams to release sheets carried by the grippers, and the release position is readily adjustable for various sizes of printed material.