Textiles: weaving – Stopping – Warp
Patent
1986-04-07
1987-03-03
Jaudon, Henry S.
Textiles: weaving
Stopping
Warp
139369, D03D 5128
Patent
active
046467890
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a contact bar assembly for the warp stop motion of a loom and comprises a metallic outer bar of U-shaped cross section and an inner bar housed partly within the outer bar, electrically insulated, which can be longitudinally reciprocated in the outer bar and which is serrated across the width of the top edge.
With a known contact bar assembly of such type (Swiss Pat. No. 430611), the inner bar is housed deeply within the legs of the outer bar of U-shaped cross section and is separated by insulating plates from these legs of the outer bar, whereby the total width of the contact bar assembly becomes very thick and the associated drop wires will have to include a correspoonding wide contact slot. This known assembly does not permit a complete removal of the inner bar from the outer bar for cleaning or repair purposes, since a bolt extends transversely through the legs of the outer bar and through a slot of the inner bar, resulting that reciprocation of the inner bar is limited and can only perform in a manner which corresponds with the length of the slot. The cross bolt which is firmly arranged in the outer bar prevents a complete removal of the inner bar from the outer bar.
In order to render the cross section of the contact bar assembly narrower, it is futhermore known (DE-OS No. 2340714) to make the inner bar only of insulation material having a narrow cross section fitting in between the two legs of the outer bar and which has one longitudinal edge located beyond the free ends of the legs from the bight of the U onto which a conductive and serrated bar is mounted in order to provide sufficient vertical space between the outer bar and the metallic conductive part to ensure adequate insulation, so that moist fluff and dust sticking on the surface of the outer and inner bars may not lead to short circuit and subsequent faulty stoppages of the loom.
With this known contact bar assembly, the inner bar is not guided and maintained in such a manner that a longitudinal reciprocation and a complete removal of the inner bar from the outer bar for cleaning or repair purposes is possible, and a separation of the inner bar from the outer bar in a vertical direction from the slot or bight of the outer bar is not possible.
The principal object of the present invention is to provide a contact bar assembly, the two bars of which-without major expenditure in manufacture concerning the shape of the outer bar and the inner bar-being coupled and guided for longitudinal reciprocation movement such, that the inner bar can be easily and completely removed from the outer bar, and that, however, during operation the inner bar cannot be taken out in vertical direction from the bight or slot of the U of the outer bar. Such longitudinal guidance while at the same time preventing a disengagement in vertical direction should be accomplished by simple means and, moreover, it should, by simple means, prevent dirt or fluff from entering between the bight of the U of the outer bar and the surfaces of the inner bar. The contact bar assembly according to the invention carries out this broad objective and has the advantages that the necessary parts needed for the longitudinal guidance and coupling arrangement of the inner bar to the outer bar is reasonable in price and easy to assemble. The openings made at intervals in the outer bar will appropriately be configured as slots extending transversely through the outer bar, whereby an appropriate guide piece preferably made of synthetic material having the shape of the slot fits exactly into the same. The guide piece is preferably held by means of snap fastening in the outer bar, and for this reason, the guide piece is appropriately configured with a protrusion at the centre of its lower edge, and above the same, is configured with a slot which makes it possible that the protrusion can resiliently snap into the slot of the outer bar of U-shaped cross section.
Further details and advantages will be understood from the following description in which an embodiment is explaine
REFERENCES:
patent: 1719234 (1928-05-01), Noyes
patent: 3246091 (1966-04-01), Koch
patent: 3817293 (1974-06-01), Childs
Grob & Co. Aktiengesellschaft
Jaudon Henry S.
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