[0001] The present invention relates to an improved warp beam for weaving looms.
[0002] As known, one of the problems which the designers of looms have to face is that of
an appropriate positioning of the warp beam and of the torsion bar controlling the
let-off motion mechanism, which torsion bar is associated to the warp beam in order
to extend the signals, anywhere produced by the variations of tension in the threads,
to the full height of the loom.
[0003] The current trend to increase the width of weaving machines, to obtain wider fabrics,
causes the hollow metal cylinder forming the warp beam in looms to be subjected to
increasingly higher stresses. It is hence necessary to increase the diameter of said
cylinder, the diameter of the torsion bar and the load to be opposed: this means an
increase of the overall volume of said unit, with serious inconveniences for the planning
of the loom.
[0004] The object of the present invention is to provide an improved arrangement of the
warp beam torsion bar unit and of the respective contrast means in a weaving loom,
reducing the overall dimensions of the warp beam and of the torsion bar, as well as
the dimensions of the elastic contrast elements, without any transmission or leverage
and allowing the warp beam to rotate about its own axis.
[0005] This is obtained, according to the invention, by arranging the torsion bar inside
the hollow cylinder of the warp beam, with its own axis parallel to but spaced from
the axis of said cylinder, two end supports connecting the cylinder to the torsion
bar by means of a clamp provided between the support and the bar and a clamp and bearing
provided between the support and the cylinder.
[0006] The invention will be described hereinafter, by mere way of example, with reference
to the accompanying drawing, which shows a preferred embodiment thereof and in which:
Fig. 1 is a head view - with some parts in section and other parts removed - of the
arrangement according to the present invention; and
Fig. 2 is a scrap view, from the top and at one end, of the arrangement of Figure
1.
[0007] With reference to the drawing, the warp beam 1 of the invention consists of a hollow
metal cylinder 2, which is mounted at each end onto a support 3 by way of a bearing
4. The cylinder 2 may thus rotate on the bearing 4 in respect of the support 3, which
is besides provided with a clamp 5, normally loose and by tightening of which the
cylinder 2 can be stopped from rotating.
[0008] The support 3 is made so as to support also the torsion bar 6, which is housed inside
the hollow cylinder 2 in an eccentric position, namely with its axis 6' parallel to
the axis 2' of the cylinder 2 but spaced therefrom, as clearly evidenced in the figures
of the drawing. The bar 6 is locked to the support 3 by a second clamp 7 of said support,
normally tightened, and its end is mounted in a conventional way onto the frame 8
of the loom.
[0009] Reference 9 indicates contrast spring means acting on the warp beam-torsion bar unit
through a lever 10 provided with a toothing 11 for hooking the spring 9 into a plurality
of positions, to which correspond variable contrast actions of said spring 9.
[0010] With the illustrated arrangement, the size of the unit comprising the warp beam and
the torsion bar therefor is notably reduced, the dimensions being - as clearly evident
from the above description and drawing - simply those of the warp beam (within whose
cylinder the torsion bar is housed). Furthermore, in said arrangement, the point in
which the resultant of the warp tensions is applied is very close to the axis of the
torsion bar, which forms the fulcrum of application thereof; the torque being generated
by said resultant is thereby small (having an arm six or seven times smaller than
that of the conventional arrangements), with the considerable advantage of allowing
to use a contrast system being less stressed, so reducing the dimensions even further.
A warp beam in a weaving loom, wherein a torsion bar is associated to the hollow cylinder
of the warp beam itself, characterized in that the torsion bar (6) is positioned inside
the hollow cylinder (2) of the warp beam (1 with its own axis parallel to but spaced
from the axis of said cylinder (2), two end supports (3) connecting the cylinder (2)
to the torsion bar (6) by means of clamp (7) provided between the support (3) and
the bar (6) and a clamp (5) and bearing (4) provided between the support (3) and the
cylinder (2).
Ensouple de métier à tisser dans laquelle une barre de torsion est associée au cylindre
creux de l'ensouple elle-même, caractérisée par le fait que la barre de torsion (6)
est placée à l'intérieur du cylindre creux (2) de l'ensouple (1), son propre axe étant
parallèle à l'axe du cylindre (2) mais avec espacement, deux supports d'extrémité
(3) reliant le cylindre (2) à la barre de torsion (6) au moyen d'une pince (7) prévue
entre le support (3) et la barre (6) et d'une pince (5) et d'un palier (4) prévus
entre le support (3) et le cylindre (2).
Kettenbaum für einen Webstuhl, bei dem eine Torsionsstange dem hohlkörperartigen Zylinder
des Kettenbaums selbst zugeordnet ist, dadurch gekennzeichnet, daß die Torsionsstange
(6) innerhalb des hohlkörperartigen Zylinders (2) des Kettenbaums (1) positioniert
ist, mit ihrer eigenen Achse parallel jedoch beabstandet zu der Achse des Zylinders
(2), mit zwei Endabstützungen (3), die den Zylinder (2) mit der Torsionsstange (6)
über eine Klammer (7) verbinden, die zwischen der Abstützung (3) und der Stange (6)
vorgesehen ist, und mit einer Klammer (5) und einem Lager (4), vorgesehen zwischen
der Abstützung (3) und dem Zylinder (2).
