Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1994-09-23
1997-09-09
Crowder, C. D.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
28107, 28111, D04H 1800
Patent
active
056643055
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage application, according to Chapter II of the Patent Cooperation Treaty. This application claims the priority date of Jan. 24, 1992 for Great Britain Patent Application No. 9201605.4.
BACKGROUND OF THE INVENTION
The present invention relates to a method of, and apparatus for engaging and disengaging a fibrous article, and to methods of, and apparatus for forming a fibrous assembly. The present invention is particularly, although not exclusively, applicable to fibrous articles which are to be made into fibrous assemblies or polyacrylonitrile filaments which are subsequently heated and transformed into a carbon-carbon product for use with brakes.
SUMMARY OF THE INVENTION
According to one aspect of the present invention a method of engaging and disengaging a fibrous article comprises causing relative movement between a support for the article and a first type of needle such that the first type of needle is caused to extend into the article; causing relative movement between the support and the first type of needle such that the first type of needle now provides the support for the article by engaging the fibres of the article, and then engaging the article with a support by causing relative movement between a support for the article and a second type of needle such that the second type of needle is caused to extend through the fibrous article and to take fibres out of the general extent of the article into the support to engage with the support.
After the fibres have been engaged with the support, the method may further comprise causing relative movement between the second type of needle and the article such that the second type of needle comes back through the article and the article remains engaged with the support and is disengaged from the needles.
The method may comprise causing relative movement between the first and second type of needles and the support or article simultaneously.
The method may comprise the second type of needle extending into but not through the article when the first type of needle supports the article.
The method may comprise moving the first and second type of needles to cause the relative movement.
The method may comprise engaging the article with the first type of needle from a first support and then engaging fibres of the article with a second support different from the first support.
The method may comprise engaging the article with the first type of needle from an upwardly facing support and, alternatively or additionally, disengaging the article from the needles by engaging fibres of the article with an upwardly facing support.
The method may comprise reorientating the article when the first type of needle supports the article. The reorientating of the article may be achieved by moving the article about a pivot axis.
The method may comprise using less of the first type of needle than the second type. The density of the first type of needle may be greater towards an edge region of the article than in a central region of the article.
The method may comprise the second type of needle causing the article to engage with a support comprising a fibrous support. That fibrous support may be provided by a fibrous article which has itself previously been engaged with another support by a second type of needle.
The second type of needle may cause the article to engage with a rotatable support which support may be rotating during engagement.
The first type of needle may engage the fibres of an article located on a rotatable support and may engage the fibres of the article when the support is rotating. Alternatively or additionally, the first type of needle may be arranged to engage an article from a stack of such articles.
The method may comprise a first set of first and second type of needles and a second set of first and second type of needles operating such that, when the first type of needle from the first set is engaging the fibres of a first article the second type of needles of the second set is able to extend through the fibres of a second
REFERENCES:
patent: 4277531 (1981-07-01), Picone
patent: 4977653 (1990-12-01), Pum
patent: 5018255 (1991-05-01), Bolliand
Lawton Peter Geoffrey
Smith Norman
Aerospace Preforms Limited
Crowder C. D.
Worrell Jr. Larry D.
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