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AssigneeMaschinenfabrik Schweiter AG
InventorHermann Werffeli
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High-speed spooling machines for yarn or thread are subject to the difficulty that, if the yarn or thread should break between a yarn cleaning, that is, size sensing and cutting apparatus and the takeup spool, stray remnant filamentary pieces may occur due to operation of the cutter apparatus since the thread size sensing apparatus may provide an erroneous "cut" signal upon absence of any thread in the sensing field. To prevent such operation, a thread sensing element is interposed in the path of the thread being spooled which, upon break of thread, will provide a "no tension" signal which will be below a predetermined threshold level. This signal is then used to inhibit operation of the cutter, regardless of the output of the thread size sensing element. To permit proper operation of the sensing unit in spite of short-time failure to sense thread tension, the "off-size" signal is preferably stored for a predetermined period, for example one second, and applied with this delay to the cutter apparatus, so that short time loss of sensed tension is not overriden but complete yarn breakage will not result in cutting action.
In a spooling machine, a method to prevent formation of stray cut filament pieces, wherein the filament is spooled with controlled tension from a payout spool (2) to a takeup spool (8), and which includes sensing means (50) and a thread cutting apparatus (56) positioned in the path of the thread from the payout spool to the takeup spool, and responsive to an "off-size" signal to sever the thread if an "off-size" signal is sensed.
In a spooling machine, apparatus to prevent the formation of cut filament pieces in which a filament is spooled from a payout spool (2) to a takeup package (8), and having means (5, 50) sensing thread size and providing an "off-size" signal if the thread size is outside of predetermined limits, a thread cutting apparatus (5, 56) positioned in the path of thread from the payout spool to the takeup package, and responsive to the "off-size" signal to sever the thread if an "off-size" signal is sensed, and means (6) deriving a tension signal representative of filament tension as the filament is being spooled from the payout spool to the takeup package, and comprising, in accordance with the invention, circuit interrupt means (58) connected to and controlling operation of the thread cutting apparatus (56), and responsive to the tension signal derived from the tension signal generating means, and connected to inhibit operation of the thread cutting apparatus upon failure of the tension signal generating means to sense a predetermined tension of filament being spooled.
Dependencies are inferred from the claim text.