US 4,536,971 AGranted

Apparatus for testing the air-permeability of lengths of textiles

OwnerHarald Pulsmeier, Walter Bestinventors

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Abstract

An air-permeability measuring apparatus for textiles includes a measuring fork having first and second rigid legs disposed in parallel overlying relations. A first double pipe stub is displacably mounted to the first leg and has inner and outer stub parts providing an inner flow channel and an annular flow channel. A second double pipe stub is mounted into the second leg and includes inner and outer stub parts providing a second inner flow channel and a second annular flow channel. The double pipe stubs are coaxial and the first double pipe stub is adapted for being displaced between an insert position and a clamping position and in the clamping position the inner and annular flow channels are aligned and communicate. A pipe extends from each of the second inner and annular flow channels and the pipes are connected to an exhauster which exerts a vacuum on the inner and annular flow channels and thereby induces air flow therethrough. A control valve is disposed in the pipe extending from the second annular flow channel and regulates the air flow therewith. A measuring apparatus is associated with the pipe extending from the inner flow channel and measures the air flow therethrough. A control system is operably connected to the control valve and the exhauster and assures constant pressure on each of the inner and annular flow channels.

Claims40

Dependent claims

An air-permeability measuring apparatus for textiles, particularly for paper-machine felts and dryer fabrics, comprising:

(a) a measuring fork having first and second rigid legs disposed in parallel overlying relation;
(b) a first double pipe stub displacably mounted to said first leg and said first double pipe stub comprising a first inner pipe stub providing a first inner flow channel and a first outer pipe stub radially spaced from said first inner pipe stub and therewith providing a first annular flow channel;
(c) a second double pipe stub mounted to said second leg and said second double pipe stub comprising a second inner pipe stub providing a second inner flow channel and a second outer pipe stub radially spaced from said second inner pipe stub and therewith providing a second annular flow channel;
(d) said double pipe stubs being coaxial and said first double pipe stub adapted for being displaced between a first insert position and a second clamping position wherein end faces of said double pipe stubs are oppositely disposed for clamping a length of fabric therebetween so that said second inner and annular flow channels commuicate with said first inner and annular flow channels;
(e) pipe means extending from each of said second inner and annular flow channels;
(f) exhauster means operably associated with each of said pipe means for exerting a vacuum on said second inner and annular flow channels and thereby inducing air flow through said first inner and annular flow channels when said first double pipe stub is in said second position;
(g) control valve means operably associated with the pipe means extending from said second annular flow channel for regulating the air flow therethrough;
(h) measuring means associated with the pipe means extending from said second inner flow channel for measuring the air flow therethrough;
and,
(i) control means operably associated with said control valve means and with said exhauster means for assuring constant pressure on each of said second inner and annular flow channels.

7 more elements

An air-permeability measuring apparatus for textiles, particularly for paper-machine felts and dryer fabrics, comprising:

(a) a measuring fork having first and second rigid legs disposed in parallel overlying relation;
(b) pipe stub means displacably mounted to said first leg and providing a first inner flow channel;
(c) a double pipe stub mounted to said second leg and said double pipe stub comprising an inner pipe stub providing a second inner flow channel and an outer pipe stub radially spaced from said inner pipe stub and therewith providing an annular flow channel;
(d) said pipe stub means being coaxial with said inner pipe stub and said pipe stub means adapted for being displaced between a first insert position and a second clamping position wherein end faces of said pipe stub means and said inner pipe stub are oppositely disposed for clamping a length of fabric therebetween so that said inner flow channels communicate;
(e) pipe means extending from each of said second inner and annular flow channels;
(f) exhauster means operably associated with each of said pipe means for exerting a vacuum on said second inner and annular flow channels and thereby inducing air flow through said inner flow channel when said pipe stub means is in said second position;
(g) control valve means operably associated with the pipe means extending from said second annular flow channel for regulating the air flow therethrough;
(h) measuring means associated with the pipe means extending from said second inner flow channel for measuring the air flow therethrough;
and,
(i) control means operably associated with said control valve means and with said exhauster means for assuring constant pressure on each of said second inner and annular flow channels.

7 more elements

Dependencies are inferred from the claim text.