The perforation punching is effected by rotary punching tools secured to ving shafts and including a first tool provided with readjustable punch pins mounted in a receiving body and a cooperating second tool provided with punch dies. The punch pins are regrindable by a grinding attachment, to tangency of their working ends with a common circle concentric with the axis of rotation of the first tool. The grinding attachment is mounted adjustably on the machine frame and permits regrinding the pins without removing the tool from its working position. The pin resetting device is mounted in the receiving body coaxial with the driving shaft of the first tool and acts simultaneously on all of the pins. The resetting device is actuable, for rotation, by an actuating means which is externally accessible. In one embodiment, the pins are of equal length and have oblique inner ends which are resiliently biased against a conical ring which can be moved axially by a gear wheel threadedly engaged with the receiving body and rotated by a pinion which, in turn, has an externally accessible drive shaft. In another embodiment, the pins are of unequal and gradually increasing length, and their inner ends engage the spiral periphery of a member rotatably mounted in the receiving body and having a gear hub engageable with an actuating pinion which may be rotated from the exterior of the machine.
Device for holding perforating tools opposite a sheet-carrying cylinder of a rotary printing press includes a bearing and indexing shaft, a carrier body axially displaceably supported by the shaft, the carrier body being formed with a bore extending therethrough axially parallel to the shaft, the carrier body being provided with a clamping device for clamping the carrier body relative to the shaft and with an actuating device for, respectively, effecting a mutual clamping of the shaft and the carrier body and for releasing a mutual clamping of the shaft and the carrier body, the actuating device including rotatably supported rings carried by the carrier body around the shaft, the rings including an eccentric ring provided with a perforating tool.
Apparatus for adjusting the knives of a pouch form, fill, seal machine. The knives are to cut pouches from a web. The knives are mounted in a generally cylindrical cage for radial sliding movement with respect to the cage. An axially movable cone inside the cage has slots in its conical surface that receive the inner ends of the knives. A screw is provided to move the cone axially to change the radial position of the knives.
A machine for continuously laterally perforating very wide paper and having an electronic control for smoothly starting and stopping the paper, a length of perforated paper detection device and combined control warning device for detecting the end of the roll of paper, wherein the machine is arranged in a compact structure having two simultaneously mechanized lateral holders which support all of the various mechanisms so as to thereby ensure the perfect positioning thereof. The actuation of the perforator heads of the machine is effected by the paper itself through a precision mechanized antiskid roller and the tension of the paper is controlled by swinging rollers whose movement is detected by a sensor and electronically processed while simultaneously taking into consideration the speed of the paper so as to control the unwinding of the feed roll of paper utilizing an electromagnet brake.
A punch assembly is provided for a rotary forms press, for punching holes in a sheet of paper or other material as the material travels between punch and die assemblies. The punch assembly is of the split ring type, and has a hub to be carried on a punch shaft and driven thereby. A split punch ring of multiple segments is provided, for mounting on the hub, with the segments being connected together. The punches are carried by the punch ring. There is a slip fit between the punch ring and the hub to allow movement between the punch ring and hub to accommodate minor repositioning of the punch ring and its punches as the punches enter holes of dies with which they will engage, with the slip fit allowing either rotary repositioning or axial repositioning. Clearance is provided to an enable a limited amount of axial repositioning.
