Facility for needling of fleece

Details Facility for needling of fleece Facility for needling of fleece

2000-10-10

2001-07-31

Worrell, Danny (Department: 3741)

Textiles: manufacturing

Textile product fabrication or treatment

Fiber entangling and interlocking

C028S114000

Reexamination Certificate

active

06266856

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a facility for needling of fleece with at least one needle board that can be driven to and fro in stitching direction by means of pushing rods borne displaceable in one guide sleeve each, and with an additional drive reciprocating in fleece feed direction and effective at the movably borne guide sleeves, which is equipped with two parallel eccentric shafts.
DESCRIPTION OF THE PRIOR ART
To extend the feed of fleece, it is known (DE 196 15 697 A1), to provide an additional needle board drive reciprocating in fleece feed direction so that the feed of fleece is extended by the motion component of the needle board in fleece feed direction. Just like the main drive effective in needle stitching direction, this additional drive for the needle board is an eccentric drive, the con-rods of which are articulated at the needle bar. By arranging two parallel eccentric shafts a parallel motion for the needle bar is achieved, as the con-rods constitute the pitmans of an articulated parallelogramm. For adjustment of the stroke the con-rods may be borne on the eccentric shafts via an adjustment eccentric to change the eccentricity of the eccentric shafts. If a parallel motion of the needle bar is abandoned (EP 0 892 102 A2), the con-rods of the two eccentric shafts can be interconnected via a coupler, upon which the needle bar is effective. In case of such an embodiment of the eccentric drive a stroke adjustment via adjustment of the mutual phase position of the two eccentric shafts becomes possible.
To prevent the con-rods of the eccentric drive for the additional reciprocating motion of the needle board in fleece feed direction from joining into the motion of the board in stitching direction, it has already been suggested to bear the pushing rods carrying the needle bar displaceable in guide sleeves, which are pivoted around an axis parallel to the eccentric shafts, so that the eccentric drive for the reciprocating needle board drive in fleece feed direction is not effective at the needle bar or the pushing rods but at the guide sleeves. However, these pivoted guide sleeves do not permit an extensive parallel motion of the needle board, in particular when the length of the guide sleeves shall be kept low.
SUMMARY OF THE INVENTION
It is therefore the objective of the invention to design a facility for needling of fleece of the above mentioned kind in such a way that an extensive parallel motion for the needle board becomes possible at a comparatively low expenditure of construction.
The objective of the invention is achieved by the feature that the guide sleeves are borne on the eccentrics of the equidirectionally driven eccentric shafts via two brackets, and are connected non-rotatable with at least one of these brackets.
By bearing the guide sleeves on the eccentrics of the two eccentric shafts a separate bearing of the guide sleeves is no longer necessary, whereby the construction is considerably simplified. The brackets connected non-rotatable with the guide sleeves permit, for the guide sleeves, only a rotation around the eccentric accommodating these brackets, so that, for definition of the stewing position of the guide sleeves, the latter need only be supported at the parallel eccentric shaft via the other of the brackets arranged in pairs. In the simplest of cases this is also achieved via a bracket connected non-rotatable with the guide sleeves. The pairs of brackets that require an equidirectional rotation of the eccentric shafts, then constitute a parallel motion for the guide sleeves, thus creating favorable guiding conditions for the additional drive of the needle board in fleece feed direction. To balance the unbalance moments as a consequence of the eccentric shafts rotating in same direction, an appropriate balancer shaft may be provided.
In order not to have to adjust the stroke of the eccentric drive for the additional needle board drive in fleece feed direction via a changed eccentricity of the eccentrics, the guide sleeves may be articulated to one of the brackets arranged in pairs, with the drive reciprocating in fleece feed direction being equipped with a device for adjusting the mutual phase position of the two eccentric shafts. Although the guide sleeves are subjected additionally to a rotary oscillation upon a change of the phase position of the two eccentric shafts, the deviation from the center position remains limited, so that guiding conditions are achieved that can largely be compared to those of a parallel motion, in particular in terms of the stitching conditions of the needles into the fleece.


REFERENCES:
patent: 3535756 (1970-10-01), Kuts et al.
patent: 3798717 (1974-03-01), Brochetti
patent: 3849845 (1974-11-01), Obenaus
patent: 4884324 (1989-12-01), Stanislaw
patent: 5732453 (1998-03-01), Dilo et al.
patent: 5873152 (1999-02-01), Jourde et al.
patent: 6000112 (1999-12-01), Ollinger et al.
patent: 2 264 257 (1973-11-01), None
patent: 196 15 697 (1997-03-01), None
patent: 0 892 102 (1998-05-01), None

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