| 摘要 |
<p>A punch ring apparatus particularly useful in a printing operating involving web fed paper is provided which is easily adapted for punching file holes, line holes, or a wide variety of hole patterns in the moving paper web, thereby substantially reducing makeready times and associated costs. The punch ring hereof preferably includes a plurality of radially-oriented, spaced-apart punches mounted in the punch ring and radially shiftable between an outermost punch position and a retracted position, with the punches being spring biased into the retracted position. The punch ring preferably includes an annular concentric groove in an axial face thereof, with the proximal ends of the punches extending into the groove when the punches are in the retracted position. One or more annular camming rings are received in the groove and configured such that axial rotation of a camming ring will outwardly shift one or more of the punches into the punch position to produce the desired hole punch pattern. Complementally, the die ring of the present invention is configured for operation with any of the hole punch patterns selectable on the punch ring. Thus, the operator can quickly and easily reconfigure the punch ring apparatus hereof for a different hole punch pattern in a minimum amount of makeready time.</p> |
