US 5,379,652 A · Method and device for measuring the nip force and/or nip pressure in a nip

Abstract

Method and device for measuring the nip force and/or the nip pressure in a nip formed by a revolving roll or by a corresponding band employed in the manufacture of paper in which measurement detectors are arranged in a series and placed in the transverse direction of the revolving roll, preferably over the entire width of the paper web. The measurement signals of the detectors are passed to a measurement amplifier unit whose connectors are controlled so that, through the measurement amplifier unit, the signal of each measurement detector is passed to a telemeter transmitter placed in connection with the revolving roll. The telemetric messages is transmitted by the telemeter transmitter wirelessly and received by means of a telemeter receiver placed outside the revolving roll. The revolving roll is provided with a transmitter/receiver in proximity to the position of the transmitter receiver placed outside the roll. The transmitter receiver outside the roll is connected to a computer or a corresponding logic unit. Between the transmitter/receivers, a two-way wireless telemetric connection is arranged, and measurement data are transferred through the connection from the roll to the computer, and from the computer, control data for the measurement system and possible calibration data are transferred to the measurement system placed in connection with the roll.

Claims20

Dependent claims

A method for measuring the force and/or pressure in a press nip in a machine, comprising the steps of:

arranging a revolving first press member with a surface thereof in nip-defining relationship with a second press member,
arranging measurement detectors in operative relationship with the surface of the first press member in an axial direction thereof, each of said measurement detectors producing a signal corresponding to a force applied onto said detector,
passing the signals from said detectors through respective openable and closeable connectors arranged in a measurement amplifier unit,
coupling a first telemeter transmitter/receiver to the first press member,
connecting said first telemeter transmitter/receiver to said measurement amplifier unit,
arranging a second telemeter transmitter/receiver at a distance from the first press member, to thereby form a two-way wireless telemetric connection between said first transmitter/receiver and said second transmitter/receiver,
coupling said second transmitter/receiver to controlling means,
passing measurement data from said detectors in the first press member through said connectors in said measurement amplifier unit, said first transmitter/receiver and said second transmitter/receiver to said controlling means, and
passing control data and/or calibration data from said controlling means through said second transmitter/receiver and then said first transmitter/receiver to selectively control the opening and closing of said connectors to regulate the flow of measurement data from said detectors.

6 more elements

A device for measuring the nip force, the nip pressure and/or the distribution of the nip force or nip pressure in a press nip formed by first and second revolving press members utilized in the manufacture of paper, comprising

detectors placed in operative relationship with a surface of the first press member in an axial direction thereof, said detectors detecting a force in a nip formed in part by the first press member and generating a signal based thereon,
a first telemeter transmitter/receiver coupled to the first press member, said first transmitter/receiver receiving the signals generated by said detectors,
a second telemeter transmitter/receiver spaced from the first press member to form a two-way wireless telemetric connection between said first transmitter/receiver and said second transmitter/receiver through which signals from said detectors are passed, and
control means connected to said second transmitter/receiver, control data from said control means being transferred through said second transmitter/receiver and said first transmitter/receiver via the telemetric connection to regulate the flow of measurement data from selected ones of said detectors being transferred via the telemetric connection to said control means.

1 more element

Dependencies are inferred from the claim text.

Method and device for measuring the nip force and/or nip pressure in a nip

Life of this patent

Method and device for measuring the nip force and/or nip pressure in a nip

Life of this patent

Abstract

Claims20