Textiles: fiber preparation – Assembling – Formed web
Patent
1994-04-07
1995-09-12
Calvers, John J.
Textiles: fiber preparation
Assembling
Formed web
28101, D04H 170
Patent
active
054488028
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus for the production of a folded non-woven fabric, comprising means including a card for making a fibre web of the non-woven fabric and a folder for folding the fibre web.
BACKGROUND
In connection with this application, a fibre web of a non-woven fabric means a fibre web manufactured of some fibre, such as cotton, glass or stone wool fibre or some other fibre by means of a card. At the manufacture of a synthetic non-woven fabric, for example, the purpose of folding is to fold a desired number of web layers on each other to form a fabric of a desired thickness to be used in waddings of different textiles, for instance.
At conventional manufacture of non-woven fabrics, raw material is brought as bales to an opener, which breaks up the bales, after which the fibres are led to a licker-in dispersing the fibres to a mass as even as possible. After this the fibres are typically led to a feed box and from there to a card. These structures relating to the production of a non-woven fabric are stationary, and the fibre web is not brought until finished by means of belt or roller conveyors to a separate folding device, which can be of pendulum or sled type. Thus, to provide the folding, both a separate folder and separate means to transfer the fibre web to the folder are required, and on the other hand, the folder shall be the bigger, the longer is the folding breadth desired. In general, it can be stated that the folder increases the total costs of the apparatus and the need of space substantially.
SUMMARY OF THE INVENTION
The object of the present invention is to set forth a new type of apparatus for the production of a folded non-woven fabric, in which the number of necessary structural elements has been successfully reduced, and thus, both the costs and the need of space of the apparatus have been substantially reduced. This object is achieved by means of an apparatus of the invention, which is characterized in that the folder comprises a transfer table, on which the card is positioned in a way allowing a back and forth movement, a mechanism for moving the card back and forth supported on the transfer table and a feed means allowing a change of distance and positioned between the card and the means providing the card with fibres.
The transfer mechanism of the card preferably comprises an endless transmission means, such as a belt, a chain or the like, arranged to run around two return wheels positioned at opposite ends of the transfer table, at least one of which wheels is driven. Moreover, it is preferable that the transfer mechanism of the card comprises means for adjusting the transfer rate of the card to agree with the web formation rate and for effecting a reversal of the card according to the folding breadth desired.
By means of the structural solutions described above, it is possible to replace a conventional folder by the transfer table of the card, whereby the total need of space is substantially reduced and conveying belts or drums, as well as pendulums and sleds, are omitted, which also reduces the production costs of the apparatus substantially. In addition, the number of the parts to be maintained, obtained in this manner, has become clearly smaller than previously, and therefore, the maintenance costs are also reduced. The bigger folding breadth is desired, the greater will the advantage of the apparatus of the invention be compared with a conventional separate folder. The back and forth movement of the card can be provided by controlling a motor driving the transmission means. In order to be able to substantially reduce the demands on this motor drive, a preferable embodiment of the apparatus of the invention is further characterized in that the means for effecting a reversal of the card and for adjusting the folding breadth comprise a switching means for the connection of the card alternatively to a portion of the endless transmission means moving in either direction and for the disconnection therefrom and spring means prefe
REFERENCES:
patent: 772832 (1904-10-01), Schofield et al.
patent: 1758517 (1930-05-01), Hess
patent: 3903569 (1975-09-01), Brandis
patent: 4628571 (1986-12-01), Marx et al.
Kuusijarvi Jouko
Pirnes Timo
Calvers John J.
MC-Konerakennus Oy
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