Patent ID: 7543815

Claim:
A system for printing an image on a printing media, comprising: a) an impression roller; b) a gripper which receives the printing media when said gripper is open, closes to hold the printing media to the impression roller while the image is printed, and opens to release the printing media from the impression roller; and c) at least one sensor which senses whether the gripper is open or closed; wherein the impression roller rotates on a rotation axis, the closing of the grippers occurs within a first angular range in the rotation of the impression roller, the opening of the grippers to release the printing media occurs within a second angular range in the rotation of the impression roller, and the at least one sensors comprise one or both of: a) a first sensor which senses whether the gripper is open or closed at a first sensor angle in the rotation of the impression roller, which first sensor angle follows the first angular range and precedes the second angular range; and b) a second sensor which senses whether the gripper is open or closed at a second angle in the rotation of the impression roller, which second angle follows the second angular range and precedes the first angular range.