REGISTRATION AND OVERLAY ERROR CORRECTION OF ELECTROPHOTOGRAPHICALLY FORMED ELEMENTS IN AN ADDITIVE MANUFACTURING SYSTEM
First Claim
1. A method for printing three-dimensional (3D) parts with an additive manufacturing system, the method comprising:
- producing a first developed layer of an electrically charged powder material on a transfer medium using a first electrophotographic (EP) engine;
feeding the transfer medium and the developed layer in a feed direction;
detecting a position of the first developed layer on the transfer medium using a first sensor, the first sensor having an output indicating the position;
adjusting a position of a moveable build platform relative to the transfer medium to reduce one or more overlay errors between the first developed layer and an intermediate build surface of a three-dimensional structure retained on the moveable build platform based on the first output, using a controller; and
transferring the first developed layer to the intermediate build surface comprising pressing the first developed layer against the intermediate build surface using a pressing element.
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Accused Products
Abstract
In a method for printing a three-dimensional (3D) parts with an additive manufacturing system, a developed layer of an electrically charged powder material is produced on a transfer medium using an electrophotographic (EP) engine. The transfer medium and the developed layer are fed in a feed direction. A position of the developed layer on the transfer medium is detected using a first sensor having a first output that indicates the position. A position of a moveable build platform is adjusted relative to the transfer medium to reduce one or more overlay errors between the developed layer and an intermediate build surface of a three-dimensional structure retained on the moveable build platform based on the first output. The developed layer is transferred to the intermediate build surface using a pressing element.
42 Citations
20 Claims
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1. A method for printing three-dimensional (3D) parts with an additive manufacturing system, the method comprising:
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producing a first developed layer of an electrically charged powder material on a transfer medium using a first electrophotographic (EP) engine; feeding the transfer medium and the developed layer in a feed direction; detecting a position of the first developed layer on the transfer medium using a first sensor, the first sensor having an output indicating the position; adjusting a position of a moveable build platform relative to the transfer medium to reduce one or more overlay errors between the first developed layer and an intermediate build surface of a three-dimensional structure retained on the moveable build platform based on the first output, using a controller; and transferring the first developed layer to the intermediate build surface comprising pressing the first developed layer against the intermediate build surface using a pressing element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18, 19, 20)
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9. An additive manufacturing system for printing three-dimensional (3D) parts, the additive manufacturing system comprising:
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a first electrophotographic (EP) engine configured to develop layers of a first electrically charged powder material; a transfer medium configured to receive the developed layers from the first EP engine; a build platform; one or more gantry mechanisms configured to move the build platform; a pressing element configured to press the developed layers on the transfer medium into contact with intermediate build surfaces of a three-dimensional structure on the build platform in a layer-by-layer manner; a first sensor having a first output indicating a detected position of a developed layer on the transfer medium; and a controller configured to adjust the one or more gantry mechanisms to compensate for one or more overlay errors between the developed layer and the intermediate build surfaces, using the first output. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification