Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate
1999-09-24
2001-06-12
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
C072S092000, C072S107000
Reexamination Certificate
active
06244089
ABSTRACT:
BACKGROUND OF THE INVENTION
This application claims the priority of 198 43 760.9, filed Sep. 24, 1998, the disclosure of which is expressly incorporated by reference herein.
The present invention relates to a device for reforming, in particular for embossing, the edge of ring-shaped or disc-shaped blanks.
Particularly in coin production, but also in other instances of use, it may be necessary to deform a flat disc-shaped blank at its edge. If, for example in the production of medals or coins, round or polygonal disc-shaped blanks have first been stamped out of a sheet of suitable material (e.g., metal), they have, at their edge, a stamping burr and a parting plane which originates from the stamping operation. In many cases, blanks of this kind cannot be embossed immediately on the flat side.
In particular, embossing cannot occur when the nature of the outer edge of the blank has to meet special quality requirements, as is often the case with coins. Moreover, there is occasionally the need to be able to design the edge in a specific way. For example, coins often have a thickened or raised edge which forms an annular rib projecting above the flat sides of the coin. The formation of such a rib makes it necessary to carry out, on the edge, an upsetting operation in which material is pressed inwards in the radial direction.
Furthermore, coins with knurling or edge lettering or any other raised or recessed edge structure are in use. Edge lettering can likewise be produced only by machining the coin in the radial direction. Coins, in which, for example, raised lettering is made in a recessed groove on the edge of the coin, are particularly demanding. Coins of this kind are shaped on the edge of the round blank. The length of the abutment element is at least such that the abutment element and the roll-forming segment completely reform the circumference of the round blank. If no edge lettering or no other raised formed elements are to be produced on the round blank, the circumference of the round blank may be rolled more than once.
If the lengths of the abutment element and of the roll-forming segment are coordinated so that the complete circumference of the round blank touches the reforming elements exactly once, raised formed elements may also be produced on the round blank. Consequently, part of the circumference of the round blank is formed or determined by the roll-forming segment of the forming wheel and another part of the round blank is formed or determined by the abutment element. This avoids one and the same edge region of a coin or round blank being rolled more than once.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a device for embossing the edge of the round blanks by making continuous rotation of the forming wheel and therefore high productivity possible. Coins or other blanks are fed intermittently to the forming wheel which, together with a further forming wheel or another abutment element, produces an embossing nip. The feed is coordinated with the angular position of the roll-forming segment. The feed takes place, in this respect, in phase with the rotation of the forming wheel.
A plurality of roll-forming segments can be provided on a forming wheel so that, during each revolution of the forming wheel, a plurality of coins or round blanks are embossed at their edge. A high output and machining of very large batches with uniform quality are thus made possible.
In order to guide the coins or round blanks during the embossing process, a positioning device can be provided to at least partially perform the function of feeding the coins or round blanks to the embossing station and of leading them away from the latter. The positioning device is formed, for example, by a plate ring or carrier ring which is mounted essentially concentrically to the forming wheel and which has receiving pockets for the round blanks. The receiving pockets are preferably configured so that the round blanks can be inserted into the pockets by simple slide devices.
If the embossing of the edge of the round blanks takes place on the station, for example between two forming wheels, the positioning device guides the round blanks to this station in coordination with the rotation of the forming wheel, waits there during the embossing operation and thereafter guides the round blanks, by further rotation, out of the embossing station which is located between the two forming wheels.
In an embodiment with a fixed abutment element, the positioning device guides the round blank through the embossing nip formed between the abutment element and the forming wheel. The rotational speed of the positioning device corresponds, to the speed at which the round blank would roll through the embossing nip automatically under the action of the forming wheel. The positioning device may be appropriately coordinated in terms of its transport speed or else freewheel, so that it is finally taken up (driven) by the round blank.
In both embodiments, the positioning device allows the round blanks to rotate freely in the receiving pockets without any slip and driven by the forming wheel. If non-round, for example octagonal, rose-shaped or other coins differing from the circular shape are to be embossed at their edge, it may be necessary to lay the round blanks into the receiving pockets of the positioning device in a fixed angular position. It may be expedient, in this situation, to fix the round blanks against rotation, at least as long as they are not in engagement with the forming wheel or the abutment element. Clamping claws, vacuum suckers, magnetic holders or other controllable holding devices can serve this purpose.
The forming wheel can be provided with roll-forming segments both on its outer circumference and on its flat side. If the forming segments are arranged on the outer circumference, a plurality of forming wheels can cooperate in a simple way. For example, a middle forming wheel may be assigned two forming wheels serving as abutments, all of the forming wheels being driven in the same direction and their shafts being oriented parallel to one another. Simple conditions arise as a result thereof.
For example, the drive is possible via a common shaft which runs transversely to the three forming-wheel shafts. This at the same time affords a simple possibility of adjusting the nip of the forming wheels relative to one another. If the bearing of the middle forming wheel is arranged, for example, at a fixed location, the bearings of the outer forming wheels may be arranged so as to be displaceable away from the middle forming wheel and towards the latter. This makes it possible, in addition to exchanging the roll-forming segments, to adapt to different coin or round-blank diameters in a simple way and without difficulty.
REFERENCES:
patent: 2909952 (1959-10-01), Moeltzner
patent: 3691806 (1972-09-01), Hanzawa
patent: 4546630 (1985-10-01), Sakamura
patent: 4779437 (1988-10-01), Kubiak
patent: 4811585 (1989-03-01), Takahashi et al.
patent: 57-39053 (1982-03-01), None
Schoenau Hein
Stobart John
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Schuler Pressen GmbH & Co. KG
Tolan Ed
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