Eccentric Cutting Drive Having a Variable Stroke
AssigneeRattunde AG
InventorUlrich Rattunde
Life of this patent
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Abstract
A pipe cutting machine, which includes a hole-type movable cutting die (6b), which is driven by a drive lever (7), by means of which circular movements with a continuously variable stroke (h) can be performed, an eccentrically shaped crank pin bearing (26) in an outer shaft (18), in which a crank pin (11), which is arranged eccentrically on a crank pin drive (23), is movably supported in relation to the outer shaft (18), the crank pin (11) being in operative connection with the drive lever (7).
Claims11
Cutting device comprises a hole-type movable cutting die (6b), which is driven by a drive lever (7), by means of which circular movements with a continuously variable stroke (h) can be performed, an eccentrically shaped crank pin bearing (26) in an outer shaft (18), in which a crank pin (11), which is arranged eccentrically on a crank pin drive (23), is movably supported in relation to the outer shaft (18), the crank pin (11) being in operative connection with the drive lever (7).
Method for cutting off a profiled section from a longitudinal profiled section (2), wherein:
- a cutting die (6a, 6b) of a cutting device (1) is set to a zero stroke position, a longitudinal profiled section (2) is placed in a cutting die (6a, 6b), an inner shaft (14) and an outer shaft (18) are operated at the same rotational speed, a speed differential of the inner shaft (14) and of the outer shaft (18) is set and as a result a position of the crank pin (23) is rotated radially outwards out of a centre line (M2) of the inner shaft (14), the crank pin (23) drives the cutting die (6a, 6b) by means of a drive lever (7) to an outwardly rotated movement which cuts off the longitudinal profiled section (2) from the long profiled section (2a) in an outwardly rotated movement.
Dependencies are inferred from the claim text.