Textiles: weaving – Warp manipulation – Shedding
Reexamination Certificate
2000-05-22
2001-04-17
Falik, Andy (Department: 3741)
Textiles: weaving
Warp manipulation
Shedding
Reexamination Certificate
active
06216750
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to machines used for forming the shed in weaving looms, and more particularly to weaving mechanisms of the Jacquard type. The invention also relates to a weaving loom equipped with such a mechanism.
2. Brief Discussion of the Related Art
In their conventional construction, Jacquard mechanisms comprise a head actuation device, placed above the loom, and a harness connecting this head to the warp yarns stretched on the loom. This harness comprises a series of harness cords directly and individually controlled by the head in a vertical movement of displacement. Each of the harness cords is assembled by a collar on one or more heddles, each heddle bearing a mail traversed by a warp yarn.
The known devices most often comprise griffe frames bearing griffes or knives intended to raise, or not, hooks kinematically linked to the harness cords. The fact of driving these griffe frames with a vertical reciprocating movement requires the use of an elaborate mechanical transmission, from the central shaft of the loom, while the precision of the shed obtained depends on the mechanical clearances of this kinematic assembly. The known mechanical devices are complex and not readily accessible, which is detrimental to assembly and maintenance thereof.
It is an object of the present invention to overcome the limitations set forth above by proposing a weaving mechanism and a weaving loom which are compact, economical and easily accessible, thus facilitating use thereof.
SUMMARY OF THE INVENTION
To that end, the invention relates to a weaving mechanism of the Jacquard type for forming the shed in a weaving loom, this mechanism being associated with a harness comprising harness cords, secured to heddles associated with the warp yarns of the loom, characterized in that the harness cords are controlled by electric actuators arranged in rows and/or in columns forming two panels disposed above the loom, and in that a unit for supplying and monitoring these actuators is housed in a compartment defined between these panels.
Thanks to the invention, it is possible for the panels formed by these actuators and the unit for supplying and monitoring these actuators, to cohabit in a compact and economical assembly which is easy to access for the operations of assembly and maintenance of the weaving loom. The compartment thus formed efficiently protects the supply and monitoring unit from its environment, particularly from mechanical shocks and dust or surrounding fluff.
According to advantageous but optional aspects of the invention, the mechanism incorporates one or more of the following features:
Two plates arranged at the ends of the panels border the compartment, one of these plates supporting means monitoring the temperature of this compartment and/or of the actuators. In that case, the temperature monitoring means advantageously comprise a ventilation unit adapted to direct a stream of cooling air towards the supply and/or monitoring unit and/or towards the actuators. Thanks to this aspect of the invention, the monitoring unit and the actuators may be cooled with the same device, which is advantageous from the standpoint of reliability and cost price of the mechanism of the invention. It may also be provided that panels form or bear channels for the circulation of air for ventilating the actuators, these panels extending substantially between the plates from the ventilation unit.
The mechanism comprises a chamber for placing the cooling air from the ventilation unit under excess pressure, this chamber being in communication with the compartment and/or the channels formed or borne by the panels, through orifices made in the plate. In that case, the opposite plate is advantageously provided with orifices for the evacuation of the cooling air coming from the compartment or the channels.
The panels are inclined with respect to one another, their spaced apart relationship increasing upwardly, an opening for access to the compartment being provided at the upper edges of these panels. In that case, a removable cover for closing this opening is advantageously provided. A walkway accessing this opening may also be integrated in the structure of the loom.
The panels are formed by boxes receiving the actuators, these boxes being assembled on one another in rows and/or columns.
The invention also relates to a weaving loom equipped with a weaving mechanism as described hereinbefore. This weaving loom is simpler to use and to maintain than the looms of the prior art. Its output is substantially improved with respect to the known art and it allows the control yarn-by-yarn or by groups of several yarns of a Jacquard harness.
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Copy of pending application, Serial No. 09/218,300 filed Dec. 27, 1998, Braun et al., entitled Electrical Rotating Actuator for Forming the Shed on a Weaving Loom and Process of Manufacturing Thereof, Weaving System and Weaving Loom.
European Patent Office, Patents Abstracts of Japan, 01292135, 11/24/99, Murata Mach Ltd., Nakajima Toshio, Dobby Machine.
Bourgeaux Pierre
Braun Dominique
Dowell & Dowell , P.C.
Falik Andy
Staubli Faverges
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