Patent ID: 8671810
Filing Date: 2014-03-18
Classification: B26D,B26F,B65H,Y10T

Abstract:
1. A printing press folder comprising: a cutting apparatus cutting a moving web to form successive signatures, wherein said cutting separates each of the successive signatures from the web; a first acceleration cylinder including a first contacting segment and a first relieved portion circumferentially adjacent to the first contacting segment, the first contacting segment radially protruding from the first acceleration cylinder with respect to the first relieved portion; a second acceleration cylinder including a second contacting segment and a second relieved portion circumferentially adjacent to the second contacting segment, the second contacting segment radially protruding from the second acceleration cylinder with respect to the second relieved portion, the first acceleration cylinder and the second acceleration cylinder gripping the web at a gripping location with the first contacting segment and the second contacting segment as the web is cut by the cutting apparatus; a motor rotating the first acceleration cylinder and the second acceleration cylinder so the first acceleration cylinder and the second acceleration cylinder have a phasing with respect to one another and the web; and a controller coupled to the motor, the controller varying a web tension as the web is cut by the cutting apparatus by controlling the phasing, said controlling the phasing including at least two modes as follows; a first mode where leading edges of the first and second contacting segments contact the web at substantially the same time as the cutting apparatus cuts the web to create a minimal amount of tension in the web, and a second mode where leading edges of the first and second contacting segments contact the web significantly before the cutting apparatus cuts the web to create a larger amount of tension in the web.