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Title: Apparatus for feeding a textile fiber band composed of staple fibers
Claims: While there are shown and described present preferred embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto, but may be otherwise variously embodied and practiced within the scope of the following claims. ACCORDINGLY, I claim: 1. An apparatus for feeding a textile fiber band composed of staple fibers, comprising: means defining a feed path for movement of at least one fiber band in a predetermined direction of travel; said means defining said feed path comprising a tube having a cross-sectional area amounting to a multiple of the cross-sectional area of a related fiber band moving through said tube; means operatively connected with said tube for producing a suction flow therein; a multiplicity of said tubes; said suction flow-producing means defining a common chamber at which terminate said multiplicity of tubes; said suction flow-producing means including means defining a source of negative pressure operatively connected with said common chamber; outlet means provided for said common chamber for the delivery of the fiber bands from said common chamber; means cooperating with said outlet means for supporting the fiber bands; a plurality of driven rolls provided for said chamber; at least one of said driven rolls comprising said means for supporting the fiber bands; means cooperating with said outlet means in order to produce a pressure equalization during such time as the fiber bands are supported by said supporting means; said one roll comprising a sieve drum; and a stationary guide comb operatively associated with said sieve drum. 2. The apparatus as defined in claim 1, wherein: said sieve drum has an inner surface; stationary screen means for covering the inner surface of said sieve drum over a predetermined peripheral region thereof. 3. The apparatus as defined in claim 2, wherein: said sieve drum has an outer surface; said screen means has an air outlet opening directed towards the outer surface of said sieve drum; and means flow communicating said air outlet opening with the atmosphere. 4. An apparatus for feeding a textile fiber band composed of staple fibers, comprising: means defining a feed path for movement of at least one fiber band in a predetermined direction of travel; said means defining said feed path comprising a tube having a cross-sectional area amounting to a multiple of the cross-sectional area of a related fiber band moving through said tube; means operatively connected with said tube for producing a suction flow therein; said suction flow-producing means defining a chamber at which terminates said tube; said suction flow-producing means including means defining a source of negative pressure operatively connected to said chamber; outlet means provided for said chamber for the delivery of the fiber band from said chamber; means cooperating with said outlet means for supporting the fiber band; said means for supporting the fiber band comprising at least a driven roll arranged within said chamber which is at negative pressure for supporting the fiber band for separating air contained in the fiber band; a feed contact roll receiving the fiber band from said driven roll and serving for driving said driven roll; said feed contact roll being positioned at a location along a path of travel of the fiber band which follows said driven roll and at a location where there essentially prevails atmospheric pressure; a shield arranged within said driven roll for communicating an internal region of said driven roll which is at negative pressure with said location at atmospheric pressure so that the air flow between the region at negative pressure and the location at atmospheric pressure augments the lift-off of the band from the driven roll to the feed contact roll in a gentle and protective manner. 5. The apparatus as defined in claim 4, further including: a multiplicity of said tubes; said chamber defining a common chamber at which terminate said multiplicity of tubes. 6. The apparatus as defined in claim 4, further including: a drafting frame with which cooperates said feeding apparatus. Other info: Inventors: Gasser, Hermann (Zurich, CH) Application Number: 842051 Filing Date: 1977-10-14 Publication_date: 1978-12-05 Assignee: Luwa AG (Zurich, CH) Primary Class(es): 19/236 19/157 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Newton, Dorsey Assistant Examiner: Attorney: Kleeman; Werner W. |
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