Mandrel used for digital printing on can members
First Claim
1. A method of location-accurate positioning and controlled precision movement of rotationally symmetrical hollow bodies, in particular integral cans comprising a body portion and a bottom, the method comprising:
- synchronously applying radially acting clamping forces to a rotationally symmetrical inside surface of a hollow body by means of a plurality of clamping surfaces provided on a rotatable clamping mandrel and forming an outwardly facing cylindrical clamping surface for engaging an inside surface of the hollow body;
rotating said clamping mandrel and said hollow body; and
synchronously disengaging said clamping surfaces from said hollow body;
wherein the radially acting clamping forces are at least one of applied and released by a pressure change caused by air flow through the clamping mandrel.
3 Assignments
0 Petitions
Accused Products
Abstract
There is proposed a clamping mandrel for a rotationally symmetrical hollow body in the form of a beverage can integrally comprising a body portion and a bottom. Accurate coupling and precise control of the movement of the mandrel is to be transmitted to the hollow body. For that purpose there are provided a plurality of clamping segments forming an outwardly facing cylindrical clamping surface for engaging an inside surface of the hollow body. The clamping segments are radially movably guided. A force-transmission device arranged in the interior of the clamping mandrel is provided for synchronous control of the radial movement of the clamping segments. That provides for controlled precision movement of a hollow body clamped by the clamping device.
68 Citations
9 Claims
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1. A method of location-accurate positioning and controlled precision movement of rotationally symmetrical hollow bodies, in particular integral cans comprising a body portion and a bottom, the method comprising:
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synchronously applying radially acting clamping forces to a rotationally symmetrical inside surface of a hollow body by means of a plurality of clamping surfaces provided on a rotatable clamping mandrel and forming an outwardly facing cylindrical clamping surface for engaging an inside surface of the hollow body; rotating said clamping mandrel and said hollow body; and synchronously disengaging said clamping surfaces from said hollow body; wherein the radially acting clamping forces are at least one of applied and released by a pressure change caused by air flow through the clamping mandrel.
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2. A method of location-accurate positioning and controlled precision movement of rotationally symmetrical hollow bodies formed integrally from a body portion and a bottom, by means of a rotatable clamping mandrel for each of the hollow bodies, the method comprising:
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co-axially fitting a hollow body on to the clamping mandrel by providing a reduced pressure within the clamping mandrel; bracing the hollow body with the clamping mandrel by a pressure force caused by the reduced pressure acting radially from the clamping mandrel, wherein the pressure force is applied by clamping segments moved outwardly and synchronously by the reduced pressure; and rotating said clamping mandrel and said hollow body with a motion unit, the motion unit comprising a controllable drive and a shaft. - View Dependent Claims (3, 4, 5, 6, 8)
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7. A method of location-accurate positioning and controlled precision movement of rotationally symmetrical hollow bodies formed from a body portion and an integrally adjoining bottom, by means of a controlledly moved clamping mandrel for each of the hollow bodies, comprising:
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co-axially fitting a hollow body on to a clamping mandrel; bracing the hollow body with the clamping mandrel by a reduced pressure within the clamping mandrel acting radially from the inside outwardly; and providing a controlled precision rotational movement of the clamping mandrel with a motion unit, the motion unit comprising a controllable drive and a shaft. - View Dependent Claims (9)
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Specification