Ejection device for ejecting a workpiece from a die in a forming

Details Ejection device for ejecting a workpiece from a die in a forming Ejection device for ejecting a workpiece from a die in a forming

1990-02-22

1991-11-26

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

264334, 425436R, 425DIG5, B29C 4540

Patent

active

050678922

DESCRIPTION:

BRIEF SUMMARY
In forming presses, it is required that the ejector slide for ejecting workpieces from dies in a forming press, having a double-armed ejector lever, the drive-side arm of which can be driven be driving rods moved in time with the forming press, the ejector-side arm of which acting upon an ejector slide, for the changing of the ejector lift, the transmission ratio of the ejector lever being changeable by the adjusting of a bearing, and having a bearing supporting the ejector-side arm. The ejector slide is used for ejecting the workpiece that was formed or partially formed in the stage and, during the forming, for counterholding a downwardly extended projection. The ejector movement must be adjusted to the length of such a projection.
A device of this type is known from DE 19 27 830 C2. In this case, the ejector lift can be adjusted by changing the lever conditions at the ejector lever, and a stop, which is fixed at the press, is provided for this ejector lever as the couterstop for the ejector slide during the forming. The ejector lift, which is to be adjusted to projections of different lengths of different workpieces causes a removal plane that differs from one workpiece to the next.
In DE 24 14 442 C2, an ejector device in a forming press was described which has a stop on the press side that can be adjusted to the length of the projection at the workpiece. This type of an adjustment is complicated and expensive. In addition, together with the changing of the ratio of transmission, the removal plane for the workpiece will also shift.
In addition, a forming press is known from EP 0 151 204 A1 which has a pressure cylinder in the power path of the ejector force in order to prevent overloading during a jamming of the ejector.
In contrast, it is an object of the invention to integrate the compensation of different projection lengths of workpieces of different types into the ejector lever In this case, the removal plane (ejector position) that can be reached by the ejector slide must be the same even if the projection lengths differ, while a stop fixed at the press is used as a counterstop during the forming.
This and other objects are achieved by the present invention which provides an arrangement for ejecting workpieces from dies in a forming press comprising an ejector slide and a double armed ejector lever having a drive side arm which is driven by driving rods moved in time with the forming press. This drive side arm forms a drive side working plane. The two armed lever has an ejector side arm which acts upon the ejector slide, the ejector side arm forming an ejector side take off plane. The arrangement also includes a shiftable bearing moveable in a shifting plane and about which the double arm ejector pivots, and adjusting means for changing an ejector lift of the ejection lever, a transmission ratio of the ejector lever being changeable by adjusting a position of the shiftable bearing in the shifting plane, and a support bearing for supporting the ejector side arm. The drive side working plane and the ejector side take off plane extend in parallel with respect to the shifting plane when the ejector lever is moved into an ejector position. For compensating different ejector lifts, the ejector lever, for each transmission ratio, in an area between the take off plane and the support bearing, has a different width, the width being determined as a function of a distance of the take off plane to the bearing minus a length of the ejector lift when the ejector lever is in the ejector position.
The special advantages of the solution result from the constant upper lift position of the ejector slide (removal plane, the lower lift position (forming plane) being variable and adjustable to the projection to be formed on a workpiece by changing the transmission ratio at the ejector lever. The changing of the transmission ratio at the ejector lever--adjustment of the ejector lift--is possible with very low expenditures with respect to manual work and time. The shape of the ejector lever in the area of its contact with

REFERENCES:
patent: 1639840 (1927-08-01), Davis
patent: 3266071 (1966-08-01), Nebendorf
patent: 3440860 (1969-04-01), Byam et al.
patent: 3820376 (1974-06-01), Koch et al.
patent: 4552525 (1985-11-01), Stehr

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