Cutting – With product handling means – Means to move – guide – or permit free fall or flight of product
Patent
1991-11-19
1993-01-19
Phan, Hien H.
Cutting
With product handling means
Means to move, guide, or permit free fall or flight of product
83 81, 83157, B23D 3302, B26D 718
Patent
active
051798840
DESCRIPTION:
BRIEF SUMMARY
The invention relates to plate shears for plate-shaped workpieces, in particular metal plates, comprising a stationary lower blade, an upper blade secured to a vertically movable blade beam, a cutting bench arranged in front of these blades, and a tilting roller table arranged behind the blades and having several parallel rows of rollers and being tiltable about an axis of rotation essentially parallel to the cutting edges of the blades and also movable back and forth relative to the blades essentially perpendicular to this axis, and an adjustable stop arranged behind the blades for workpieces to be cut to a given width.
In known plate shears of this kind (German patent 33 09 369) when narrow strips with, for example, a width of up to approximately 150 mm are being cut off, the tilting roller table has to be pulled back before the cutting so that the narrow strips which have been cut off the workpiece or other small parts do not get caught on the tilting roller table and the stop arranged above it but can fall freely in the downward direction. It is, therefore, not possible for the small cut-off parts to be carried away, for example, into various stacking containers via the tilting roller table.
The object of the invention is to remedy this deficiency and to design generic plate shears such that small parts which have been cut off a workpiece, in particular narrow strips, can also be carried away via the tilting roller table in an orderly fashion, i.e., without getting caught on the stop.
The object is accomplished in accordance with the invention by tilting of the tilting roller table downwards about its axis of rotation simultaneously bringing about lowering of the front edge of the tilting roller table.
In a preferred embodiment of the invention, the axis of rotation of the tilting roller table extends in front of the blades in the region of the cutting bench as tilting of the tilting roller table downwards thereby necessarily simultaneously brings about lowering of the front edge of this table.
The following description of a preferred embodiment serves in conjunction with the appended drawings to explain the invention in further detail. The drawings show:
FIG. 1 schematically a partly broken-open front view of plate shears;
FIG. 2 a schematic partly sectional view along line 2--2 in FIG. 1;
FIG. 3 the rotary mounting of a tilting roller table of the plate shears in a first operating position;
FIG. 4 the rotary mounting from FIG. 3 in a different operating position; and
FIG. 5 a modified embodiment of plate shears.
A horizontal cutting bench 2 is formed at the front side of plate shears 1 (on the left in FIG. 2) and a workpiece which is to be cut, for example, a metal plate is placed on it and pushed into the cutting position (to the right in FIG. 2). The cutting position is determined by an adjustable stop 3 against which the front edge of the pushed-in workpiece rests. The plate shears comprise as essential components a stationary lower blade 4 whose horizontally extending cutting edge 5 may protrude somewhat beyond the horizontal surface of the cutting bench 2 and an essentially vertically movable upper blade 6 whose cutting edge 7, as shown in FIG. 1, extends slightly at an incline from the bottom left to the top right. The upper blade 6 is secured in a known manner to a blade beam 8 which is tiltable about a horizontally extending axis of rotation 9. Hence from a workpiece which is introduced between the blades 4, 6 and rests with its front edge against the stop 3, a part whose width corresponds to the spacing of the cutting edge 7 from the stop 3 is cut off during the downwardly directed movement of the upper blade 6.
Arranged at the rear side of the plate shears, i.e., behind the blades 4, 6 and opposite the cutting bench 2 is a tilting roller table 11 whose rollers 12 are arranged in several parallel rows of rollers extending essentially perpendicular to the blade edges 5, 7. As indicated by a dashed line in FIG. 2, the tilting roller table 11 is tiltable into an inclined position extending down
REFERENCES:
patent: 923109 (1909-05-01), Biggert, Jr.
patent: 2549560 (1951-04-01), Archer
patent: 3631750 (1972-01-01), Hanni
patent: 3793916 (1974-02-01), Jarman
patent: 4313357 (1982-02-01), Hawkins
Kutschker Wolfgang
Pesold Erwin
Phan Hien H.
Reinhardt Maschinenbau GmbH
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