Roll embossing
The roller embossing is a mode of production of coins .
This embossing process , which is new in comparison to hammer embossing, was invented around 1550. At this time, a roller embossing mill was first set up in the Hall in Tyrol mint , which was initially powered by horses. There were two innovations in the coin:
- The sheets from which the coins are made ( Zaine ) were rolled out by two heavy iron rollers to the exact thickness of the desired coin.
- The teeth were then introduced through another roller press. Several hardened embossing dies were incorporated into its upper and lower rollers . During this run, the coin image was embossed on the metal sheets.
The second step turns a coin mint into a roller mint. The front and back stamps of the nominal coin were attached separately on rollers running in opposite directions. The finished minted coins were then cut out of the metal sheets ("cut out").
The minting with circular stamps results in slightly oblong oval coins with a slight curvature. For this reason, the dies were worked in a longitudinal oval in relation to the direction of passage through the rollers. Circular minted coins could also be produced in this way.
The pocket mill represents a further development of the roller embossing mill .
literature
- Heinrich Halke: Concise dictionary of coinage and its auxiliary sciences. Printed and published by Georg Reimer, Berlin 1909.
- N. Bauer: Dictionary of coinage. 2nd Edition. Walter de Gruyter & Co, Berlin 1970.
Web links
- Glossary (accessed May 12, 2016)
- The roller stamping of the Hall in Tirol Mint (accessed on May 12, 2016)
- The artwork of the month (accessed May 12, 2016)
Individual evidence
- ↑ Helmut Kahnt, Bernd Knorr: Old dimensions, coins and weights. A lexicon. Bibliographisches Institut, Leipzig 1986, licensed edition Mannheim / Vienna / Zurich 1987, ISBN 3-411-02148-9 , p. 398 b .