Apparatus for cutting through or trimming a pipe or can in a plane transverse to its longitudinal axis
AssigneeThomassen & Drijver-Verblifa N.V.
InventorWillem P. Post
Life of this patent
Estimating the term…
Abstract
An apparatus for cutting through transversely or trimming pipes, pieces of tubing or cans by means of two cooperating shearing members having each a cutting edge which extends in a circular or otherwise closed line. These shearing members are mounted for relative radial wobbling shearing movement. There are provided in the apparatus also means for keeping the cooperating cutting edges at a safe axial distance from one another to avoid, during operation, damage to them, said means at the same time allowing the shearing members to relatively move in all radial directions to achieve the wobbling shearing operation.
Claims13
Apparatus for cutting circumferentially through the wall of a tubular workpiece such as a can body, comprising an inner shearing member presenting a continuous, outwardly directed, outer peripheral cutting edge received within the workpiece and an outer shearing member presenting a continuous, inwardly directed, inner peripheral cutting edge surrounding the workpiece, and means for moving said cutting edges relative to each other substantially only in radial directions with respect to the workpiece in continuous, progressive fashion completely around the circumference of the workpiece to effect the cutting thereof.
Apparatus for cutting circumferentially through the wall of a tubular member such as a can body, comprising mandrel means having a continuous, outwardly directed outer peripheral cutting edge freely received within the tubular workpiece for rotation about a predetermined axis generally concentric to the longitudinal axis of the workpiece without imparting rotation to the workpiece, an outer shearing member presenting a continuous, inwardly directed inner peripheral cutting edge surrounding the workpiece, means for axially positioning said cutting edges so as to provide a slight axial gap therebetween and for freely allowing said outer shearing member to rotate about said predetermined axis and to shift relative to said inner cutting edge in radial directions with respect to said predetermined axis, cam means for constraining the cutting edge of said outer shearing member to shift radially inwardly into overlapping relation with said cutting edge within the tubular workpiece whereby to shear through the wall of the workpiece at one location, and drive means for rotating said mandrel means and said outer shearing member in unison while said cutting edges are overlapped so as to shear progressively and continuously through said wall until the wall is severed throughout its circumference.
An apparatus for cutting through a tubular member such as a cam body in a plane extending transversely of the longitudinal axis of the member by means of two cooperating shearing members, the first one of said shearing members being a disc, a ring or a mandrel having extending along an edge of its outer circumference a radially outwardly pointing self-closed cutting edge, of which the radius of curvature in each point is equal to or somewhat shorter than that in a corresponding point of the inner circumference of the pipe or can to be cut through or trimmed, so that said pipe or can fits around the first shearing member accurately or with clearance, and the second one of said shearing member being a ring or a bushing having extending along an edge of its inner circumference a radially inwardly pointing self-closed cutting edge, of which the radius of curvature in each point is equal to or somewhat longer than that in a corresponding point of the outer circumference of the pipe or can, so that said pipe or can fits in the second shearing member accurately or with clearance, and further with the aid of driving means adapted to move the ring or bushing-shaped second shearing member successively in all radial directions in respect of the first shearing member in such a manner, as to ensure that during operation the cutting edge of the second shearing member contacts successively with all its points a self-closed line extending inside and concentrically with the cutting edge of the first shearing member, the improvement wherein:
- the first shearing member (8,9) is formed on or attached to a mandrel (1), which is mounted for rotation about a longitudinal axis on a holder (23);
- the second shearing member (10,11) is formed on or attached to an annular or tubular member (6) supported by and surrounding the mandrel (1), said latter member (6) having an active circular peripheral guideface and being so supported, as to be locked against axial movement and, if necessary, against rotation but as to be movable, if necessary against spring force (21), in all radial directions in respect of the mandrel (1) and the first shearing member (8,9);
- a guideway (27) is provided which is adapted to cooperate with the circular peripheral guideface of the annular or tubular member (6) said guideway (27) and the mandrel (1) being mounted for relative movement in a direction at right angles with the axis of rotation of the mandrel;
- and
- the driving means so rotate the mandrel and so effect said relative movement of the guideway (27) and the mandrel (1) during operation, as to force the annular or tubular member (6) with its circular peripheral guideface to roll in contact with the guideway (27) and to force thereby successively all points of the cutting edge (11) of the second shearing member (10) to move radially towards and from the axis of rotation of the mandrel (1) past the cutting edge (9) of the first shearing member (8).
Dependencies are inferred from the claim text.