US 4,307,597 AGranted

Puller for extrusion profiles

AssigneeFriedrich Wilhelm Elhaus

InventorsFriedrich W. Elhaus, Eckhard Makel

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Abstract

A puller for extrusion profiles at an extruder is disclosed including a carriage which is movable on rails along a runout conveyor for the extrusion profiles and at which a puller head with a fixed and a movable clamping jaw is arranged for pivotal movement about a vertical axis so that the puller head may be swung laterally out of the runout conveyor. The two clamping jaws extend approximately across the width of the runout conveyor, and the movable clamping jaw comprises a plurality of clamping segments which are supported at the puller head for free swinging movement about a horizontal axis and adapted to be pivoted in opening sense by a drive means. The clamping segments are provided with clamping curves of such curvature that, at all pivot positions of the clamping segments, the points of contact between the extrusion profile to be clamped and the clamping curve always lie at least approximately on a clamping straight line intersecting the horizontal pivot axis at an inclination of a desired clamping angle with respect to a line perpendicular to the runout conveyor.

In a pulling apparatus for displacing extrusion profiles (62) produced by an extruder, including a carriage (4) displaceable on rails (2, 3) mounted adjacent an endless runout conveyor (1), puller head means (5) including a fixed clamping jaw (18), a movable clamping jaw having a plurality of clamping segments (14') supported for free swinging movement about a horizontal pivot shaft (32), and drive means (17, 30, 31) for pivoting said clamping segments toward opening positions relative to said fixed clamping jaw, thereby to release an extrusion profile that is clamped between the movable and fixed jaws;

the improvement wherein
(a) each clamping segment includes adjacent the fixed jaw a clamping curve surface (60) the configuration of which fulfills the equation
r=r.sub.1 .multidot.e.sup..phi.tg.alpha.
wherein
.alpha.=the clamping angle between a line perpendicular to the runout conveyor and the clamping straight line (66) between the moveable segment pivot axis and the point of contact (61) between the movable and fixed jaws in the absence of an extrusion profile;
r.sub.1 =the distance between the pivot axis (16) of the movable segments and the point of contact (61) of the movable and fixed jaws in the absence of an extrusion profile;
.phi.=the angle through which the movable clamping segments are swung when clamping an extrusion profile;
and
r=the distance between the movable segment pivot axis (16) and the point of engagement (65) between the movable clamping jaw segments and the extrusion profile;
thereby to cause, at all pivot positions of each clamping segment, the points of contact (61, 63, 65) between the clamping curve surface and the extrusion profile to be always located at least approximately on a clamping straight line (66) intersecting the horizontal pivot axis at a clamping angle (.alpha.) of from 30.degree. to 40.degree. with respect to a line perpendicular to the plane of the runout conveyor.

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Abstract

Claims11