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phil-vision GmbH
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Model pvPhotobox -Machine Vision System For Special  Custom Printing of Coins

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You are printing coins, medals or flat opbjects and the print has to fit exactly? Don`t waste your time positioning the individual objects! With the pvPhotobox you print exactly where you want! The pvPhotobox system for special coin printing, first records the position and rotation of coins on a tray and then a generates a print image from the measurement data (position and rotation) in combination with a template created by the user, which is then sent to a selected printer or print server via the local network.

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  • Illumination: LED-backlight and white diffuse LED line lights
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A previously calibrated black tray with several fixed markers and coins of defined thickness is inserted into the pvPhotobox via a drawer. In this closed setup four cameras are positioned above the tray and capture images. First, the orientation and position of the tray is recorded using markers on the tray.

Then, the coins are identified and their position and orientation in relation to the markers is determined. A print image is generated from this data and sent to the VersaWorks software. The user then only has to release the print job.

Calibration

Before teaching the coins with their patterns, a calibration must be created for each tray to establish the reference between the printer coordinate system and the camera coordinate system.

The required geometries of the tray and the associated printer are recorded using barcodes, reference marks and print markers.

Alignment of the print image

A tray of evenly spaced coins is placed in any position in the pvPhotobox, images are captured and then the print image is superimposed over the coins.

On the monitor, an existing print image that matches the respective coin is placed over the coin images. The coin model and the position of the print image on the coin are stored.