EP0988997B1 - Device for embossing edges of circular blanks - Google Patents

Abstract

The embossing machine incorporates at least one wheel (7) rotarily mounted on a pivot axle (8), connected to a drive mechanism, and fitted with hob-milling segments (11). At least one abutment element (14) has at least one hob-milling segment and has an active length just large enough to extend the hob-milling segment of the wheel to a complete periphery of the round object (1). A positioning piece (26) holds the round objects and is positioned between the wheel and the abutment element.

Description

The invention relates to a device for forming, in particular for embossing the edge annular or disc-shaped Blanks.

Especially in coin production, but also in otherwise it may be necessary to a flat disc-shaped blank at its edge deform. Are for example in the medal or coin production initially from a board of suitable material (Metal) round or polygonal disc-shaped blanks punched out, they have one at the edge Stanzgrat and a resulting from the punching separation surface on. In many cases, such blanks not immediately imprinted on the flat sides. This especially not if the nature of the outer margins of special quality requirements as is often the case with coins. Furthermore Occasionally there is the demand to place the margin in certain To be able to shape the way. For example. have coins Often a thickened or raised edge, one over the flat sides of the coin projecting annular rib forms. The formation of such a rib requires one Upset at the edge, where the material in the radial direction pressed inwards.

In addition, coins with a knurling or a Edge lettering or other raised or recessed edge structure in use. An edge label can also only by machining the coin in the radial direction be generated. Particularly demanding Coins in which, for example, sublime script in a recessed Groove is attached to the edge of the coin. such Coins are difficult to produce, which is for counterfeiters high hurdle represents. This applies to round coins and in even higher for non-round coins or medals.

In coin production must be very high volumes to the cash requirements of entire economies to be able to satisfy. It is therefore true the coin production on it that large quantities with Consistently good quality can be produced in a short time are. A special hurdle is the edge lettering of round blanks or coins. Here must be in any case the pattern to be applied to the border or the writing so be applied precisely that beginning and end of the The label does not overlap and no gaping gap. With raised writing or patterning this results particular problem that an already shaped area can not be rolled over again without the font deform.

On this basis, the invention is based Task, a device for edge embossing of To create round blanks, the diverse design options allowed on the discs and the high productivity allows.

This object is achieved with the device having the features of claim 1.

The device according to the invention has at least one Forming wheel, which in turn with at least one Abwälzformsegement is provided. This is provided with a profile, molded on the edge of the blank or coin shall be. The Abwälzformsegment extends in Circumferential direction of the forming wheel, wherein it is preferably only occupies part of the circumference. The length of the Abwälzformsegments or the length of its profile be so dimensioned that with half the circumference of the Ronde or the coin matches.

The forming wheel is assigned an abutment element, the even as a form wheel or as a fixed abutment can be trained. On the abutment element is a Impression segment provided, which carries a profiling, the is to be molded on the Rondenrand. The length of the abutment element is at least so great that the abutment element and the rolling die segment the circumference of the blank completely reshape. Is no border caption or are not to form any other raised form elements on the round plate, The circumference of the round blank can roll off several times.

Are the lengths of the abutment member and the Abwälzeformsegments so tuned that the full Circumference of the blank touches the forming elements exactly once, can be formed on the Ronde and raised mold elements become. Thus, the circumference of the round blank becomes part of the Abwälzformsegment the form wheel and another Part of the abutment element molded or determined. On this way it avoids having one and the same edge area a coin or round blank rolls off several times.

The inventive concept for embossing the edge Round blanks allow continuous rotation of the form wheel and thus high productivity. The form wheel, the with another form wheel or other abutment element makes an impression gap, coins or other blanks fed clocked, the feed matched to the angular position of the Abwälzeformsegments is. The supply takes place in so far in the right to the Rotation of the form wheel.

On a forming wheel can several Abwälzformsegmente be provided so that at each Formradumdrehung several coins or round blanks are stamped on their edge. This allows a high output and processing very large lots with consistent quality.

To guide the coins or blanks during the embossing process is preferably a positioning device provided that at least partially take over the function can supply the coins or blanks to the embossing point and lead them away from this. The positioning device is, for example, by a plate or carrier ring formed, which is substantially concentric with the forming wheel is stored and has receiving pockets for the blanks. The receiving pockets are preferably such that the blanks with simple slider devices in the Pockets can be inserted. If the edge stamping takes place the blanks, for example, between two form wheels in the square leads the positioning of the discs matched to the Rotation of the forming wheel at this point, remains during the Embossing process there and leads the rounds thereafter by further rotation out of the embossment, which is between located both form wheels. In one embodiment with fixed abutment leads the positioning the blank by the between the abutment element and the forming wheel formed Prägespalt. The rotational speed the positioning device corresponds to this the speed with which the round blank under the effect of the forming wheel roll by itself through the embossing gap would. The positioning can in their transport speed be tuned accordingly or too run free, so they are ultimately taken away by the Ronde (driven).

In both cases, the positioning allows a free rotation of the blanks in the receiving pockets slip-free, driven by the form wheel. Should non-round, For example, octagonal, rosette-shaped or other from the Circular shape deviating coins are stamped on its edge, It may be necessary to set the round blanks in one Angular position in the receiving pockets of the positioning to lay. It may be appropriate, the Round blanks, at least as long as they are with the form wheel or the Abutment not engaged, against rotation to fix. These clamps, vacuum suction, Magnetic holders or other controllable holding means serve.

The form wheel can be used both on its outer circumference also provided on its flat side with Abwälzformsegmenten be. Are the mold segments arranged on the outer circumference, can interact in a simple way several form wheels. For example. can use a middle forming wheel two as an abutment serving form wheels are assigned, all are driven in the same direction and their shafts parallel aligned with each other. This leads to simple Conditions. For example. is the drive of over a common Shaft possible across the three forming wheel shafts runs. This also opens up an easy way the gap setting of the form wheels with each other. Is this Bearing of the middle form wheel, for example, fixedly arranged, The bearings of the outer forming wheels can move away from this and be arranged to be adjustable to this. this makes possible in addition to the replacement of Abwälzformsegmente a simple and easy adaptation to different coin or Blank diameter.

Advantageous details of embodiments of the Invention are the subject of subclaims, the drawing and / or the description.

Fig. 1

eine mit einer Randprägung versehene Ronde, in schematischer Darstellung,

Fig. 2

eine Vorrichtung zum Randprägen der Ronden, in einer schematisierten Draufsicht,

Fig. 3 bis Fig. 5

die Vorrichtung nach Figur 2, in unterschiedlichen Arbeitsstadien, in schematisierten Draufsichten,

Fig. 6

eine abgewandelte Ausführungsform der Vorrichtung zum Randprägen von Ronden, in einer schematisierten Draufsicht, und

Fig. 7 und Fig. 8

die Vorrichtung nach Figur 6, in unterschiedlichen Arbeitsstadien, in schematisierten Draufsichten.

In the drawings, embodiments of the invention are illustrated. Show it:

Fig. 1

a plate provided with a marginal embossing, in a schematic representation,

Fig. 2

a device for embossing the blanks, in a schematized plan view,

FIG. 3 to FIG. 5

2 shows the device according to FIG. 2, in different stages of work, in schematized plan views,

Fig. 6

a modified embodiment of the device for edge stamping of blanks, in a schematic plan view, and

FIGS. 7 and 8

the device of Figure 6, in different stages of work, in schematic plan views.

In Fig. 1, a blank 1 is illustrated, whose Edge 2 is provided with an embossing. The imprint will formed by a circumferential groove or groove 3, at the Floor raised elements, for example, formed a font is. In Fig. 1, the raised elements are smaller on the groove bottom arranged projections 4 indicated. Instead of However, the projections 4 can also depressions, Nutunterbrechungen, Stars, letters or other form elements or symbols are provided. The edge 2 of Blanket 1 can also be formed without a groove. The Ronde 1 is circular in plan view in the present example, however, it can also deviate from the circular shape Shape, for example, a polygonal shape with rounded Have corners or a rosette shape.

To form the embossed edge 2 on the blank 1 serves the device 6 schematically indicated in Fig. 2. To the device 6 includes a central forming wheel 7, the is mounted rotatably about an axis 8. Not one further illustrated drive device is forth Forming wheel 7 in an illustrated by an arrow 9 Direction of rotation continuously driven.

On the forming wheel 7 are circumferentially from each other spaced one or more, for example, 4, 6 or 8 Abwälzformsegmente 11 arranged radially for adjustment purposes can be stored adjustable. Each rolling form segment 11 shows a negative mold for the edge embossing of FIG. 1 illustrated blank 1. The corresponding profile extends in the circumferential direction over the respective Abwälzformsegment 11. The length of this profile is the same about half the circumference of Ronde 1. The Abwälzformsegmente 11 can be interchangeable to adapt to different Circles 1, i. different diameters and edge profiles. The form wheel 7 are two further form wheels 14, 15 associated with the embossing of Round blanks 1 each form an abutment.

The forming wheels 14, 15 substantially coincide with the Form wheel 7 match. They are also with rolling elements 16, 17 provided, each having a shape profile, that assigned to half the circumference of the blank 1 is. In this case, the rolling-shaping element 16 or 17 complements the Profile of the respective rolling form element 11 to a complete circumferential profile of a blank 1. The rolling form segments 16, 17 are also radially adjustable on the Form wheels 14, 15 mounted to a precise adjustment of the To allow device 6. In addition, the form wheels 14, 15 rotatably mounted about axes of rotation 18, 19. The the Form wheel 7 driving, not further illustrated, Drive device is preferably also with the Form wheels 14, 15 coupled and drives these, as by Arrows 21, 22 illustrated, in the same direction with the forming wheel 7 and with the same speed, as well as in fixed Phase relationship.

The forming wheels 14, 15 are also preferably on the form wheel 7 to and from this adjustable to the Distance between the forming wheels 14, 15 and the between them to adjust arranged forming wheel 7 can. In Fig. 2 is this symbolized by arrows 23, 24. Between the form wheel 7 and the forming wheel 14 and the forming wheel 7 and the forming wheel 15 is in each case at the narrowest point an embossing point defined, takes place at which the forming of the blank 1. The embossing point is determined by the fact that the center the blank 1 with the axes of rotation 8, 18 and 8, 19 each lying on a straight line.

Concentric with the forming wheel 7 is a plate 26th arranged and rotatably mounted, with a separate Drive device is connected. On the plate 26 are Carrier 27, 28 stored, the discs 1 can accommodate. she are provided with appropriate receiving pockets that both radially inwardly and radially outwardly open are. One in each receiving pocket lying Ronde 1 is in each case at its the forming wheel 7 facing edge region as well as at their respective form wheel 14 or 15 facing edge area and is thus accessible. In addition, the respective receptacle 27, 28 is such, that the blanks 1 can rotate freely in the receiving pocket. However, they are stored or supported in the axial direction.

The plate 26 associated drive device is set up the plate 26 to accelerate relatively quickly and delay. The movement is on the constant rotation of the forming wheel 7 tuned, the rotates synchronously with the forming wheels 14, 15, wherein it is rigidly connected with these.

For feeding blanks 1a to the receptacles 27, 28 of the plate 26 serve feeders 31, 32, with which individual blanks 1a radially inward into the receptacles 27, 28 or their pockets are pushed, if these are aligned with the feeds 31, 32. The feeders 31, 32 may each have a feed channel 33, 34, which is adapted to the dimensions of the blank 1a and in which the blanks 1a lying flat in the respective aligned Pocket of shots 27, 28 are inserted if this is in front of the mouth of the feeder 31, 32.

The device 6 described so far works like follows:

To clarify this is further simplified Fig. 3 to 5 referenced. The movement of the plate 26 is tuned to the rotation of the forming wheels 7, 14, 15, that the undeformed round blank 1, then in one Embossing position 46 has arrived, if the respective Beginnings 16a, 11a of the rolling mold segments 16, 11 each other stand opposite. In this case, the beginnings 11a, 16a with the center of the round plate 1 and the axes of rotation 8, 18 a line. Accordingly, the beginnings are 11a, 17a with the axes of rotation 8, 19 and the center of between the forming wheels 7, 15 held Ronde 1 on a line. In this position, the plate 25 stops, leaving the free rotatably mounted discs 1 remain in this place. The Rotation of the forming wheels 7, 14, 15 is now in the direction of Arrows 9, 21, 22 continue until the Abwälzformsegmente 11, 16 and 17, 11 completely at the edge of the blank 1 are unrolled. Each blank 1 has exactly half Turn performs. The result of the rolling motion is illustrated in Fig. 4. The profiles of the rolling form segments 11, 16 and 17, 11 are on the edge of the round blank 1, for example, the shape shown in Fig. 1 may have accepted.

Are the Abwälzformsegmente 11, 16 and 17, 11 by further rotation of the forming wheels 7, 14, 15 disengaged come the discs 1, the plate 26 is about the axis of rotation 8 accelerates, whereby the blanks, as indicated by arrows 41, 42 illustrates from the stamping spaces between the forming wheels 7, 14, 15 led out. With the same movement can new rounds 1 introduced in the stamping room when the plate 26 with appropriate receptacles is provided.

Notwithstanding the illustrated in Figures 2 to 5 Embodiment, the receptacles 27, 28 also on a straight path to the embossment and from this be led away. It is essential that they belong to the in Figure 3 illustrated beginning of the embossing process at the Are embossing and him after (Figure 4 or 5) on one Leave the track on which it is disengaged from the mold segments 11, 16, 17 come.

With the presented methods and the device 6 can be achieved a variety of edge shapes. For example. can in The simplest form of edge for removing a punching burr be shaped. In addition, the border can with a Lettering and ornament will be provided. This can both sublime and deepened. Besides, it is possible to provide the edge with a groove in the one Pattern, a lettering, especially a raised one Label, can be arranged. They are both round as well as polygonal coins or discs at their edge machinable or compressible. Should non-round coins or Blanks can be edited for this, in or on the pockets of the receptacles 27, 28 clamping or fixing be provided with the the coins or blanks at least temporarily rotatably storable.

A modified embodiment of the invention Device is schematically illustrated in Figure 6. The form wheel 7 is consistent with the above formed embodiment described. It points one or more Abwälzformsegmente 11, which is a part Emboss the circumference of the blank 1 and to do so with a corresponding Profile are provided. The abutment element for the forming wheel 7 does not become like the above Embodiments by forming wheels 14, 15, but by a fixed abutment member 51 is formed with the specified by the Abwälzsegment 11 arc a Gap 52 defines substantially uniform width. The length of this gap 52 substantially corresponds to the half the circumference of the blank to be embossed. This one is in a recording 53 held from which he with respect Rotary axis 8 of the forming wheel 7 both radially inward than also projecting radially outwards, so that he both with the Abwälzformsegment 11 and with the abutment-shaped segment 51 can come into contact. The abutment molding segment 51 carries on its side facing the forming wheel 7 side a profile that the profile of the Abwälzformsegments 11 too the full circumferential profile added to the border of the blank 1 is to be molded.

The receptacle 53 is on a plate or otherwise Device at least in sections on one arcuate, through the embossing gap 52, leading track guided. The speed is less than that of the Formrads 8 and corresponds when the blank 1 in the embossing column 52 is the speed at which the blank 1 under the driving action of the form wheel 8 through the Embossing gap 52 is running.

The embossing process is illustrated in FIGS. 6, 7 and 8. While the Ronde 1 in Figure 7 amid the Stamping gap 52 is formed, is the forming process in 8 ended and the round plate 1 can now from the recording 53 are removed.

A device for round embossing of round blanks, in particular Coins, has a form wheel, which with Abwälzformsegmenten 11 is provided. The form wheel 7 are abutment elements Assigned 16, 17, also on the form wheels 14, 15 can be stored. A positioning device 26 leads the blanks 1 on the same direction synchronous Rotation of the forming wheels 7, 14, 15 matched between the Form wheels and after the edge embossing from the wheel spaces out.

Claims (11)

1. Device (6) for stamping the edges of round blanks (1),

   with at least one forming wheel (7), which is disposed to rotate around a rotational axis (8) and is connected to a drive means and which is provided with hobbing segments (11), the effective length of which extends respectively about a predetermined angular amount around the rotational axis (8), and

   with at least one abutment element (14), which has at least one forming segment (16), the effective length of which is dimensioned to be at least so large that it supplements the hobbing element (11) of the forming wheel (7) to form a complete periphery of the round blank (1).
2. Device according to Claim 1, characterised in that the effective length of the forming segment (16) is dimensioned to be just sufficiently large that it supplements the hobbing element (11) of the forming wheel (7) to form a complete periphery of the round blank (1).
3. Device according to Claim 1, characterised in that a positioning means (26) is provided between the forming wheel (7) and the abutment element (14) to receive and guide the round blanks.
4. Device according to Claim 3, characterised in that the positioning means (26) has a support plate or a support ring segment, in which or on which pockets are configured to receive the round blanks (1).
5. Device according to Claim 1, characterised in that the hobbing segments (11) each have an effective length, which is the same as half the periphery of the round blanks.
6. Device according to Claim 1, characterised in that the hobbing segments (11) are arranged on the outer periphery of the forming wheel (7).
7. Device according to Claim 1, characterised in that the hobbing segments (11) are arranged on a flat side of the forming wheel (7).
8. Device according to Claim 1, characterised in that the abutment element (14) is a forming wheel, which is disposed to rotate around a rotational axis (18) and stands in drive connection with a drive means and which is provided with hobbing segments (16).
9. Device according to Claim 1 or 8, characterised in that the hobbing segments (16) are arranged to be adjustable on the outer periphery of the forming wheel (7) or the forming wheels (7, 14), and that the rotational axes (8, 18) of the forming wheels (7, 14) are oriented parallel to one another.
10. Device according to Claim 1 or 8, characterised in that the hobbing segments (11, 16) are arranged on the flat side of the forming wheel or forming wheels, and that the rotational axes of the forming wheels are oriented at an angle to one another.
11. Device according to Claim 1, characterised in that the abutment element (14) has a hobbing segment (51) arranged to be fixed at a distance from the forming wheel (7).

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