Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1977-12-16
1980-01-22
Petrakes, John
Measuring and testing
With fluid pressure
Dimension, shape, or size
19240, 73160, D01G 2306, D01H 538, G01N 926, G01B 1300
Patent
active
041843614
ABSTRACT:
An apparatus for sensing the density variation of a sliver, includes a sliver funnel through which the sliver passes and which has an intake portion, a discharge portion and a chamber formed as an enlarged part of the discharge portion. The chamber is, through a lateral opening, in communication with a source of pressurized air and a pressure sensing device. The pressure sensing device receives pneumatic signals as a function of the variation of pressure in the chamber dependent upon the density of the sliver portion momentarily present in the chamber. The sliver funnel is arranged at an output of a carding machine for receiving a web discharged thereby and for combining the web into a sliver passing through the chamber. The pressure sensing device comprises a pressure-responsive precision sensor which includes an arrangement for converting the pneumatic signals into digital signals.
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patent: 3154810 (1964-11-01), Horne
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patent: 3485095 (1969-12-01), Hirata et al.
patent: 3710421 (1973-01-01), Tooka
patent: 3722260 (1973-03-01), Staheli
patent: 3752170 (1973-08-01), Murbach
patent: 3854330 (1974-12-01), Wildbolz
patent: 4075739 (1978-02-01), Staheli
Petrakes John
Trutzschler GmbH & Co. KG
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