EP1658962B1 - Transfer press - Google Patents

Abstract

The press has a press plunger (2) located opposite to a clamping plate (1) having an insert that is arranged such that the insert alternatively moves in direction towards and away from the press plunger. The insert is moved up and down by a cam drive that is actuated by a press main drive with lifting and lowering cams whose cam tracks are traced by lifting rollers and lowering rollers under compressive prestress. An independent claim is also included for a use of a multistage press for a manufacture of lids for beverage cans.

Description

The present invention relates to a multi-stage press according to the preamble of independent claim 1 and the use of this press for the production of lids for beverage cans.

For the industrial production of beverage can lids today mostly multi-stage presses are used, in which in addition to the up and down movement of the press ram movement of mold elements on the ram to and from this way. This movement is generated in the multi-stage presses known today by the fact that the movable tool elements are coupled via crank or cam drives or by means of lever or Zugstangenanordnungen with the ram drive. However, all known multi-stage presses have the disadvantage that they can be driven only with relatively low numbers of strokes per minute and the precision of movement decreases rapidly with increasing stroke rates.

It is therefore the object to provide a multi-stage press available, which does not have the disadvantages of the prior art, or at least partially avoids.

This object is achieved by the multi-stage press according to claim 1.

Accordingly, a first aspect of the invention relates to a multi-stage press with a machine-fixed platen and a platen opposite and operating against the platen. Within the platen, an insert is arranged, which serves to receive a tool and is connected to such drive means, for example with a servomotor or driven by the press drive cardan shaft, that in response to a movement of the press ram alternately in the direction of the press ram is movable to and from this. In this case, the insert and the drive means in both directions of movement are positively connected with each other, which is done with arranged therebetween coupling means which convert the rotating rotational drive movement of the drive means in the up and down movement of the insert by at least one circumferential rotating on a rotating component of the coupling means Guide surface is tapped with picking means. In this case, separate Abgreifmittel are available for both directions of movement, ie both for the Aufals and for the Abbewegung. This makes it possible to provide multi-stage presses which can be operated at high stroke rates while providing excellent precision of motion.

In a preferred embodiment of the Mehrstüfenpresse the picking means for both Bewegüngsrichtungen are biased against each other, so that they tap under pretension the at least one guide surface. This makes it possible to perform the conversion of the rotary drive movement in the up and down movement without play, which can be further increased precision.

If there is a separate guide surface for each of the two directions of movement, which is preferred, then it becomes possible to realize asymmetrical movement sequences of the insert as well.

Advantageously, for tapping the movement for the direction of movement of the insert on the press ram to more picking means available as for tapping for the direction of movement of the press ram away, since in this way the former movement, in which typically a forming or cutting work is performed under significantly greater load than the latter can be done.

In a further preferred embodiment of the multi-stage press, the at least one guide surface formed by a cam or a cam, wherein it is also preferred if the picking means are designed as tapping rollers. As a result, large forces can be transmitted in a simple manner.

It is also advantageous if the tapping rollers are mounted for both directions of movement in a common component, as this additional games are avoided and it is also possible in a simple manner to bias the tapping rollers of the two directions of movement against each other, for. by their bearings are coupled via clamping screws with each other.

Are in such a multi-stage press the tapping rollers stored in a common lever, preferably in the region of one end of the lever, wherein the lever is mounted in the press frame and operatively connected to the insert that provided by the tapping force with a gear ratio greater than one on the mission is transmitted, so very large lifting forces can be provided on the insert.

Preferably, the position of the storage of the common lever can be adjusted in the press frame, so that a compensation of manufacturing tolerances is possible.

In yet another preferred embodiment of the multi-stage press, the insert has a longitudinal extent in the direction of passage of the press, which is at least half, preferably at least two-thirds of the longitudinal extent of the clamping plate. This results in the possibility of arranging a plurality of identical tools on the insert and thus produce a corresponding number of products per press stroke.

Preferably, the insert is plate-shaped, preferably substantially rectangular, so that it is as universal as possible with tools can be equipped and at the same time forms a stable structure.

In yet another preferred embodiment of the multi-stage press is the axis of rotation of the component of the coupling means, which provides the at least one circumferential guide surface, and thus also the axis of rotation of this guide surface, arranged parallel to the direction of travel of the press, whereby it is possible, in the direction of passage a plurality of coupling arrangements with guide surfaces and Abgreifmitteln along a single shaft strand to arrange and thereby coupling with each other without play.

In yet another preferred embodiment, the insert is guided linearly by means of guide means, which is accomplished in embodiments with tapping rollers mounted in a common lever with advantage in that the guide means comprise at least one guide column guided in an upper and in a lower linear bearing and the lever in the Area between the two linear bearings on the guide column attacks. This results in a particularly robust construction.

If the multi-stage press has a plurality of identical coupling means or arrangements with guide surfaces and gripping means, such as e.g. a plurality of cam sections, which are seen over the extension of the insert at several locations, preferably at exactly two locations, and advantageously in the direction of travel of the press are arranged one behind the other and are connected to the insert, so relatively long operations can be realized without the risk a tilt exists.

If all the elements of the coupling means required for the conversion of the rotary drive movement into the movement of the insert are integrated in the machine bed, which is preferred, this results in a compact construction with a minimum of external, moving parts, which can reduce the risk of injury and the moving components are also protected from dirt and damage.

As a drive means for providing the rotary drive movement for the coupling means is preferably connected to the press drive propeller shaft or a servomotor present, the former variant has the advantage of a mechanically synchronized coupling and the latter the advantage of a simple adaptation to existing plants.

If in this case the propeller shaft or the servomotor is coupled via a reduction gear to the component providing the at least one guide surface, the torque applied to the propeller shaft or servomotor is reduced, as a result of which the torsional load of the components involved can be reduced.

A second aspect of the invention relates to the use of the multi-stage press according to the first aspect of the invention set out above for the production of lids for beverage cans. In such use, the advantages of the invention become particularly apparent.

• Fig. 1a eine Vorderansicht einer ersten erfindungsgemässen Mehrstufenpresse;
• Fig. 1b einen Vertikalschnitt in Pressen-Durchlaufrichtung durch das Maschinenbett der Presse aus Fig. 1a;
• Fig. 1c einen Vertikalschnitt durch das Maschinenbett der Presse aus Fig. 1a entlang der Linie A-A in Fig. 1b;
• Fig. 1d einen Schnitt entlang der Linie B-B in Fig. 1c;
• Fig. 2 einen Schnitt wie Fig. 1b durch eine zweite erfindungsgemässe Mehrstufenpresse; und
• Fig. 3 einen Schnitt wie Fig. 1c durch eine dritte erfindungsgemässe Mehrstufenpresse.

Further preferred embodiments of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:

• FIG. 1a is a front view of a first multi-stage press according to the invention; FIG.
• FIG. 1b shows a vertical section in the press through direction through the machine bed of the press from FIG. 1a; FIG.
• Figure 1c is a vertical section through the machine bed of the press of Figure 1a along the line AA in Fig. 1b.
• Fig. 1d is a section along the line BB in Fig. 1c;
• FIG. 2 shows a section as in FIG. 1b through a second multi-stage press according to the invention; FIG. and
• Fig. 3 shows a section as Fig. 1c by a third inventive multi-stage press.

The basic structure of a first multistage press according to the invention can be seen from FIGS. 1a to 1d, which show a front view of the press as well as various sections through the machine bed 11 of the press. As can be seen, the press has a press ram 2 which can be moved intermittently up and down with the press drive (not shown) for performing punching and / or forming work with a tool (not shown) attached thereto. The plunger 2 is arranged opposite a machine-fixed clamping plate 1, within which an insert plate 3 is arranged. The insert plate 3 is guided vertically displaceably in the machine bed 11 with two guided in each case in upper and lower linear bearings 12 guide columns 13 and can be moved in response to movement of the plunger 3 on this and away from this, for generating a plunger movement superimposed movement of on the insert plate 3 attached tool elements (not shown). In this case, the driving of the insert plate 3 takes place in that drive energy is provided by the main press motor via a propeller shaft 4, which is then fed via an angle reduction gear 14 and a torsionally rigid metal disc clutch 18 of a parallel to the direction of passage D of the press camshaft 15, the cam 5 then move the lever 3 connected to the insert 3 back and forth and thereby raise the insert 3 and lower. The camshaft 15 is mounted in several, each designed as exchangeable units bearings 18 in the machine bed 11 and each has two cam sections, each consisting of two wider lift cam 5 and a narrower Absenknocke 5 arranged therebetween. The cam track 8a each Hubnocke 5 is of two Lifting rollers 6 tapped while the cam track 8b of the Absenknocke 5 is tapped by a single Absenkrolle 7. The lifting and lowering rollers 6, 7 of each cam section are mounted on one end of a lever 9 and biased against each other so that they tap the cam tracks 8a, 8b under bias. At the other end of the lever 9 is articulated via a tab 16 on a machine-fixed hinge 10, which is used as a removable insert in the machine bed 11 and whose position is adjustable by means of an eccentric. Between its two ends of the lever 9 is coupled via pins 17 with the associated guide column 13, so that the tapping movement when tapping the guideways 8a, 8b performed by the lever 9 in a purely translational up and down movement of the guide column 13 and carried by this insert plate 3 is implemented.

Fig. 2 shows a vertical section in the direction of passage D through the machine bed 11 of a second inventive multi-stage press, which differs from that shown in Fig. 1 essentially differs in that only one centrally located in the machine bed 11 cam section is present, which here, however, three lift cams 5 and two Absenknocken 5 has, whereby here too the cam track 8a each lifting cam 5 is tapped by two lifting rollers 6 and the cam track 8b each Absenknocke 5 of a single Absenkrolle. 7

Fig. 3 shows a vertical section transverse to the direction of passage D through the machine bed 11 of a third inventive multi-stage press, which differs from the two types shown above substantially in that the lifting and lowering rollers 6, 7 are mounted directly in the guide column 13 and so can be dispensed with a lever. Also, only one cam 5 is present here per cam section, whose cam track 8 is tapped off both by the lifting roller 6 and by the lowering roller 7.

Although exclusively rollers 6, 7 are used as the picking means according to the claims in the present examples, it is also contemplated that other picking means, e.g. Use levers with sliding surfaces.

Claims (19)

1. A multistage press having a clamping plate (1) fixed to the machine and having a press plunger (2) which is located opposite the clamping plate (1) and works against this, an insert (3) being arranged within the clamping plate (1), said insert being operatively connected to drive means (4) in such a way that it is alternately movable in the direction towards and away from the press plunger (2) by the drive means (4) in dependence on a movement of the press plunger (2), a form-fitting coupling with the drive means (4) being present in both movement directions, and coupling means (5, 6, 7) being arranged between the drive means (4) and the insert (3), said coupling means being designed for converting a revolving rotatory drive movement of the drive means (4) into the movement of the insert (3) in that, at a revolving rotating component (5) of the coupling means (4), at least one revolving guide face (8, 8a, 8b) is traced by tracing means (6, 7), characterised in that separate tracing means (6, 7) are present for each of the two movement directions.
2. A multistage press according to Claim 1, characterised in that the tracing means (6, 7) for both movement directions are prestressed against one another in such a way that they trace the guide face (8, 8a, 8b) under prestress.
3. A multistage press according to one of the preceding claims, characterised in that separate guide faces (8a, 8b) are present for each of the two movement directions.
4. A multistage press according to one of the preceding claims, characterised in that more tracing means (6) are present for the movement direction of the insert (3) towards the press plunger (2) than for the movement direction of the insert away from the press plunger (2).
5. A multistage press according to one of the preceding claims, characterised in that the at least one guide face (8, 8a, 8b) is formed by a cam (5) or an eccentric disc.
6. A multistage press according to Claim 5, characterised in that the tracing means (6, 7) are constructed as tracing rollers (6, 7).
7. A multistage press according to Claim 6, characterised in that the tracing rollers (6, 7) for both movement directions are mounted in a common component (9).
8. A multistage press according to Claim 7, characterised in that the tracing rollers (6, 7) are mounted in a common lever (9), particularly in the region of one end of the lever (9), and in that the lever (9) is operatively connected to a point (10) of the machine bed, which point is fixed to the machine, and to the insert (3) in such a way that a force provided by the tracing rollers (6, 7) is transmitted to the insert (3) with a transmission ratio of greater than one.
9. A multistage press according to Claim 8, characterised in that the point (10) which is fixed to the machine is constructed to be adjustable.
10. A multistage press according to one of the preceding claims, characterised in that the insert (3) has a longitudinal extent in the process flow direction (D) of the press which is at least half, particularly at least two thirds, of the extent of the clamping plate (1) in this direction (D).
11. A multistage press according to one of the preceding claims, characterised in that the insert (3) is of a plate-shaped construction, and particularly in that this is substantially rectangular.
12. A multistage press according to one of the preceding claims, characterised in that the axis of rotation of the component (5) of the coupling means which provides the at least one revolving guide face (8, 8a, 8b) is arranged parallel to the process flow direction (D) of the press.
13. A multistage press according to one of the preceding claims, characterised in that the insert (3) is linearly guided by guide means (12, 13).
14. A multistage press according to Claim 8 and according to Claim 13, characterised in that the guide means (12, 13) have at least one guide column (13) guided in an upper and a lower linear bearing (12) and the lever (9) is operatively connected to the guide column (13) in the region between the two linear bearings (12).
15. A multistage press according to one of the preceding claims, characterised in that the press has a plurality of identical coupling means (5, 6, 7) which, as seen over the extent of the insert (3), are operatively connected to the insert (3) at a plurality of locations, particularly at exactly two locations.
16. A multistage press according to one of the preceding claims, characterised in that all those elements of the coupling means (5, 6, 7) which are required to convert the rotatory drive movement into the movement of the insert (3) are integrated in the machine bed (11).
17. A multistage press according to one of the preceding clams, characterised in that an articulated shaft (4), connected to the press drive, or a servo motor is present for providing the rotatory drive movement for the coupling means (5, 6, 7).
18. A multistage press according to Claim 17, characterised in that the articulated shaft (4) or the servomotor is coupled by way of a reduction gearing (14) to the component (5) providing the at least one guide face (8, 8a, 8b).
19. A use of the multistage press according to one of the preceding claims for manufacturing lids for beverage cans.

Images