Automatic machine for curving thin and rectilinear elements, suc

Details Automatic machine for curving thin and rectilinear elements, suc Automatic machine for curving thin and rectilinear elements, suc

1985-07-02

1987-04-07

Combs, E. Michael

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

Plural or complex apparatus

72142, 72309, 72311, 140 71R, B21F 4500, B21D 1100

Patent

active

046550690

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a machine for curving thin and rectilinear metal element sections of the wire, strip or tube kind, this machine comprising positioning means for holding on a first axis a first metal element section to be bent, and at least one bending member which cooperates with a counter-bending part placed on said first axis and which, on the one hand under the action of a first drive mechanism, may be driven with an angular rotational movement about a second axis perpendicular to the first one and aligned with the counterbending part and, on the other hand by means of a second drive mechanism, may be moved with a reciprocal movement along a third axis parallel to the second one, said bending member being moreover movable, jointly with the counter-bending part, in a direction parallel to the first axis.
In machines of this type, which are currently used for curving metal wires with a view more particularly to manufacturing bent wire articles, the angular rotational movement of the bending member takes place, at each bending cycle, between the outgoing and return travels of its reciprocal movement.
With the succession of these movements, the bending member can first of all be brought into lateral contact with the wire, then rotated through a certain angle, in one direction or the other, so that it bends the wire about the counter bending part and finally retracted before the bending member is moved with the counter bending part. The amount of bending of the wire depends on the angle through which the bending member is caused to rotate, and the advancing pitch of this latter determines the length of the bent wire segment.
Although these machines offer entire satisfaction when they are used for forming bends in one and the same plane, it is known that every attempt made to adapt them for bending wires in all directions in space more especially with a view to manufacturing carcases or skeletons for motor vehicle seats, have not up to now succeeded in providing simple solutions ensuring a high production rate. The problems arising from bending wires in all directions in space are further aggravated when it is desired to form in succession, singly or in small scale or medium scale mass production, wires bent in different spatial configurations.
The present invention proposes a curving machine which, while being simple in structure and automatic in operation, ensures high production rates and, with a loss of time reduced to the minimum, allows bent wires to be formed in succession with different spatial configurations, this machine being further of great flexibility in use in that it can bend wires of any diameter but also other thin and elongate metal elements, such as strips and tubes.
According to the invention, this curving machine, which is of the type specified in the preamble, is characterized in that the means for positioning the metal element section to be bent comprise, on the one hand, a nipper adapted for immobilizing, on said first axis, the metal element section to be bent and, on the other hand, a pair of jaws movable jointly with the bending member and one at least of which is mobile, the noses of these jaws forming said counterbending part, said nipper being further mounted for rotation about the first axis and associated with a third drive means adapted for imparting thereto an angular rotation about this axis.
Rotation of the nipper allows the orientation of the bending member to be modified at will, with respect to the wire, in a plane perpendicular to this latter and consequently the bending member may, whenever it stops along the wire, curve this latter in a different spatial direction.
In a preferred embodiment, the curving machine of the invention comprises two bending members each associated with a counter-bending part and disposed on each side of the nipper.
As will be readily understood, this arrangement allows the production rate of the machine to be doubled. It should be further noted that, on each side of the nipper, the two bending members may bend the wire in co

REFERENCES:
patent: Re27021 (1971-01-01), Ott
patent: 3045740 (1962-07-01), Davis
patent: 3245433 (1966-04-01), Taylor

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