Sheet curls reformer

Details Sheet curls reformer Sheet curls reformer

1989-05-05

1990-08-28

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Flexing, bending, straightening or decurling means

162252, 162197, 162271, 493459, D21F 700, B65H 2324

Patent

active

049522817

ABSTRACT:
The present invention provides an apparatus for straightening sheet curls in which a wrap angle .theta. is provided for a sheet wound off from a winding roll by applying a decurler bar to the sheet between two backup rolls, the apparatus comprising a wrap angle adjusting device for adjusting the wrap angle of the sheet by relatively displacing the backup rolls and the decurler bar, and a controller which serves to calculate an optimum wrap angle in accordance with changes in the diameter of the winding roll using the logical equation: .theta.=A/D.sup.q +B (wherein A, B, q are constants which are previously determined) from which the optimum wrap angle .theta. can be calculated for the diameter D of the winding roll, and to control the wrap angle adjusting device on the basis of the results of this calculation. In consequence, the present invention is able to realize automatization of straightening of curls with a simple configuration and in a rapid and highly precise manner.

REFERENCES:
patent: 4539072 (1985-09-01), Frye et al.

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