Calender with magnetic device for adjusting the contact pressure between the rolls
AssigneeSgm Co., Ltd.
InventorDanilo Molteni
Life of this patent
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Abstract
A magnetic calender comprises a pair of rotatable parallel rolls (1, 2) and an electromagnet provided with two pole pieces (6, 7) extending parallel to the rolls (1, 2) and joined to a common base (5) through a plurality of magnetic cores (8) having an arrangement which is specularly symmetrical with respect to both the transverse mid-plane and the longitudinal mid-plane of the calender. A coil (9) and a control solenoid (10) located adjacent to the relevant pole piece (6, 7) are wound around each of the cores (8), and the intensity of the current circulating in the coil (9) is controlled by an adjusting unit (11) which is in turn controlled by a control unit (12) which receives and processes the magnetic flux reading carried out by the control solenoid (10).
Claims7
A magnetic calender comprising at least a pair of rotatable parallel rolls and at least an electromagnet provided with two pole pieces extending parallel to said rolls at least along a useful contact length, wherein said pole pieces are joined to a common base through a plurality of magnetic cores having an arrangement which is specularly symmetrical with respect to both a transverse mid-plane and a longitudinal mid-plane of the calendar, a coil and a control solenoid located adjacent to the relevant pole pieces being wound around each of said cores, an adjusting unit connected to said coil for controlling an intensity of a current circulating in said coil, and a control unit conected to said control solenoid for receiving and processing a magnetic flux reading carried out by said control solenoid so as to in turn control said adjusting unit for controlling the intensity of the current circulating in said coil.
Dependencies are inferred from the claim text.