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US 4,473,929 AGranted
Magnetically cushioned cloth tentering device
OwnerSanford M. Greeninventor
Life of this patent
Estimating the term…
Abstract
A cloth tentering device wherein the tentering force for spreading cloth is produced magnetically between a permanent magnet member accommodated within a tubular cloth or engaged with the selvages of a flat cloth and rows of electromagnets in position separate from and parallel to the cloth. The tentering force can be freely adjusted in the course of the tentering operation by controlling the energizing current of the electromagnets.
Claims9
A tentering device adapted to spread an elongated strip of cloth having two longitudinal edges, said cloth moving on the tentering device in a direction parallel to the longitudinal edges of said cloth, comprising
- magnetized means supported by said tentering device, for applying tentering forces to said cloth,
- means for connecting said magnetized means to each longitudinal edge of said cloth,
- means attached to said tentering device comprising electromagnets with first electromagnets positioned adjacent the outboard side of each longitudinal edge of said cloth and second electromagnets positioned adjacent the inboard side of each longitudinal edge of said cloth with each of said first electromagnets producing a magnetically attractive force to said magnetized means and with each of said second electromagnets producing a magnetically repulsive force to said magnetized means.
Dependencies are inferred from the claim text.