Severing by tearing or breaking – Breaking or tearing apparatus – Movable breaking tool
Patent
1998-08-21
2000-08-15
Rachuba, M.
Severing by tearing or breaking
Breaking or tearing apparatus
Movable breaking tool
225 97, B26F 300
Patent
active
061022683
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device to eliminate pre-cut pieces, particularly scrap, from a sheet of material comprising scores or the like.
It relates more particularly to a device to eliminate pre-cut pieces from a sheet of material, in which said sheet is disposed on a separation surface of a matrix such that the pre-cut piece covers a hole in the matrix and is pressed downwardly through this hole under the pressure of at least one separation or stamping member.
BACKGROUND OF THE INVENTION
Such devices are known and are particularly described in German patent DE-A-41 24 098. In the case of these devices, the hole is generally of a size smaller than the pre-cut portion such that, during pressure exerted by the punching member on the pre-cut piece, the pre-cut piece is deformed within said hole to be ejected from said hole. The problem with such devices is that they generate a certain number of wedgings of the scrap within the hole. These wedgings require stopping the ejection station to free the hole.
In improved devices, the punching member coacts with a resilient abutment member disposed below the pre-cut piece and projecting at least partially into the opening. This abutment member which, in a rest position, is substantially disposed retracted or flush with the separation surface, is adapted to be deformed by spacing from the separation surface during pressure exerted by the punching member on the pre-cut piece, to occupy an inclined position relative to the separation surface. An example of such a device is given in the patent EP-A-446 702. In this case however, it is observed that the scrap is eliminated by sliding of the resilient abutment member. It sometimes happens that the pre-cut piece remains fixed to the punching member. In the case of this device, there is then no possibility to detach the scrap from the punching member. Moreover, it is noted that such a device requires fixing each abutment member by means of a suitable securement member such as a screw. As a result, there is a long and difficult mounting. Moreover, the abutment members used are of complex shape and hence troublesome. Finally, such a device has a large size below the matrix whilst, in all the ejection stations, in general, there exists very little space between the lower surface of the matrix and the rest of the station. Finally, removal of such an abutment member is relatively difficult because of its inaccessibility.
SUMMARY OF THE INVENTION
The present invention thus has for its object to provide a device to eliminate pre-cut pieces, in which the resilient abutment member can be installed on the matrix in a blind recess, its positioning on the matrix being such that it does not increase the size of the matrix while remaining easily accessible so as to facilitate its emplacement and removal.
Another object of the present invention is to provide a device to eliminate pre-cut pieces whose resilient abutment member can be positioned precisely and if desired adjustably.
To this end, the invention has for its object a device to eliminate pre-cut pieces, particularly scrap, from a sheet of material comprising scores or the like, said sheet being located on a separation surface of a matrix such that the pre-cut piece covers a hole in the matrix and is pressed downwardly through this hole under the pressure of at least one punching member, said punching member coacting with at least one resilient abutment member disposed below the pre-cut piece and projecting at least partially into said hole, characterized in that the hole in the matrix comprises at least one recess radiating in the direction of an axis passing through said hole to open into this hole, this recess being shaped to receive and retain the head of a blade comprising a resilient abutment member, this blade being pushed aside upon encountering a pre-cut piece during a pushing movement exerted by the punch member passing through the hole of the matrix, the free end of the blade preventing the return of the scrap after each separation
REFERENCES:
patent: 5181640 (1993-01-01), Vossen et al.
patent: 5443195 (1995-08-01), Sinn
Rachuba M.
Troiano Dominic
LandOfFree
Device for removing separated portions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for removing separated portions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for removing separated portions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1998040