Advancing material of indeterminate length – By orbitally traveling material-engaging surface – On endless belt or chain
Patent
1992-08-24
1994-08-23
Jillions, John M.
Advancing material of indeterminate length
By orbitally traveling material-engaging surface
On endless belt or chain
B65H 2006
Patent
active
053400089
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/DE/91/00150 filed 22 Feb. 1991 and based, in turn, upon German national application G 90 02 430.3 filed 2 Mar. 1990.
FIELD OF THE INVENTION
Our present invention relates to a fabric conveyor system, particularly for automatic cutting and sewing installations for textile webs or the like, whereby a textile web or individual pieces of material are conveyed, preferably at their edges, by continuous conveyors such as driven belts towards work stations such as stations for folding, hemming selvedge consolidation or the like, and whereby the textile web travels between endless belts and a stationary rail, or stationary freely rotatable rollers, and whereby means are provided for pressing the textile web against the stationary rail, or rollers and the belt lying with its flat side against the textile web is supported on its respective opposite side by a plurality of elastic pressure pads.
BACKGROUND OF THE INVENTION
A fabric conveyor system of the above-described kind is known from DE-A-38 44 581.
Such fabric conveyor systems are frequently used in automatic textile machines of all kinds. In such systems it is most important to guide the textile goods precisely to and between the work stations, in order to avoid irregularities. These irregularities can occur due to the slippage of the textile goods between the guides, but also due to the slippage of the smooth belt from its drive disk. When textile goods are referred to here, generally we include in the definition any kind of flat goods made of any material such as textile, plastic, cardboard, etc.
Special difficulties are encountered in guiding textile webs when the thickness of these webs varies. The slippage of the drive belt from its drive disk results in uneven belt speeds, which in turn produce irregularities in the goods at the work station. When the belt portion between the guide rollers sags, variations in the contact pressure on the textile web occur over lengths of several meters.
From DE-A-38 44 581 a fabric conveyor system is known in which a smooth, flat belt is used as a continuous conveyor.
In this system, it is possible that slippage can occur between the guide or driving rollers and the belt, which can lead to irregularities in the guidance of the material.
Furthermore, this construction requires a pressure means, which presses the smooth face of the conveyor belt against the workpiece. For this purpose in a boxlike hollow profile a pressure means in the form of an inflatable pressure hose is provided, which can act upon a pressure-transmitting member consisting for instance of elements subdivided in the longitudinal direction. This element subdivided in longitudinal direction can be formed by a band element having individual segments connected to each other by elastic webs. As already described above, this arrangement does not insure a slippage-free entrainment between the guide or driving rollers and the endless belt of the continuous conveyor.
In addition considerable manufacturing and structural expenses are related to the arrangement of the pressure-medium-actuatable hose, including the pressure member actuated by the hose. Also the adjustment to the variable thickness of the running textile web or the like may not be satisfactory. In earlier systems it has been proposed to provide several pressure hoses as pressure elements which can be differently actuated. However this allows only an insufficient degree of adjustment of the individual segments of the pressure-transmitting element.
Hence it is essential for the individual elements of the pressure-transmitting member not to be in fact separate elements, but at least elements connected to each other by elastic webs.
OBJECT OF THE INVENTION
It is the object of the present invention to provide a fabric conveyor system capable of guiding the goods precisely over longer stretches and with variable thickness of the goods and to ensure the absence of slippage to a large extent at a uniform contact pressu
REFERENCES:
patent: 3140030 (1964-07-01), Stewart
patent: 3482840 (1969-12-01), Cytrin
patent: 4707158 (1987-11-01), Hofmann
patent: 4817845 (1989-04-01), Franchuk
Freermann Johannes
Malcherek Dieter
Carl Schmale GmbH & Co. KG
Dubno Herbert
Jillions John M.
Kateshov Yuri
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