US 5,329,822 AGranted

Yarn tension sensor for a textile machine

AssigneeW. Schlafhorst AG & Co.

InventorsRobert Hartel, Karl-Josef Hoehne, Ferdinand-Josef Hermanns, Herbert Henze, Herbert Knors, Dietmar Engelhardt, Wilhelm Zitzen, Manfred Veyes, Herbert Merkens, Wolfram Weissenfels, Hermann Ruetten, Dirk Jaegers, Berndt Pommer

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

The invention to a yarn tension sensor, in particular for yarns traveling at high speed, to accurately ascertain even short-term yarn tension fluctuations. According to the invention, a yarn guide element is mounted on one head end of a plunger coil disposed in a magnetic field. A position sensor is disposed in the region of the plunger coil and detects even minimal changes in position of the plunger coil. These changes in position are reported to a controller, at whose output variations in current are generated and supplied to the winding of the plunger coil, the variations being such to compensate for the axial force generated by the yarn and acting upon the plunger coil, thereby making the plunger coil virtually motionless.

Claims14

Dependent claims

A yarn tension sensor for a textile machine, particularly adapted for measuring the tensioning of a yarn traveling at high speed, comprising:

means for generating a magnetic field,
plunger means having a coil winding and disposed for axial movement within said magnetic field, said plunger means having a surface in direct contact with the yarn for axial movement of the plunger in response to yarn tension fluctuations,
a position sensor disposed in sufficiently close proximity to said plunger to detect changes in the position thereof representative of tension fluctuations in a yarn traveling in contact with said yarn contact surface, and
a controller connected to said position sensor to receive plunger position signals therefrom and connected to said coil winding of said plunger for regulating electrical current through said coil winding as a function of said plunger position signals from said position sensor to produce an axial force of said plunger sufficient to compensate for said tension fluctuations.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 07/940,671Filed 4 Sep 1992
Priority: DE 41298037 Sep 1991
Granted: 19 Jul 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01L 5/108
Using electrical means: for measuring a reaction force applied on a single support, e.g. a glider
B65H 59/24
And arranged to apply pressure to material: surfaces movable automatically to compensate for variation in tension
B65H 59/40
Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators: applications of…
G01L 1/086
By the use of counterbalancing forces: using electrostatic or electromagnetic counterbalancing forces