Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1987-10-23
1989-07-04
Stodola, Daniel P.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 7547, B65H 2304
Patent
active
048443719
ABSTRACT:
An apparatus for controlling a tension of a sheet delivered from a rotatable sheet roll includes a brake device including a shaft connectable to the sheet roll for rotation therewith, a brake disc fixedly mounted on the shaft, and a friction member rotatably mounted on the shaft. The apparatus further includes a device for urging the friction member against the brake disc to apply a braking force thereto, a member operatively connected to the friction member for limiting the rotation of the friction member, a sensor for measuring a reaction force exerted on the rotation limiting member when the friction member is urged against the brake disc to produce a first measurement signal, a sensor for detecting a rotational speed of the sheet roll to produce a second measurement signal, a sensor for detecting the amount of delivery of the sheet from the sheet roll to produce a third measurement signal, and a microprocessor unit programmed to be responsive to the first, second and third measurement signals to calculate the tension of the sheet. The microprocessor unit is programmed to determine a difference between the calculated tension and a reference tension to output information representative of the tension difference. The urging device is responsive to the information from the microprocessor unit to adjust the urging of the friction member against the brake disc so that the calculated tension coincides with the reference tension.
REFERENCES:
patent: 2964826 (1960-12-01), Klein et al.
patent: 3289959 (1966-12-01), Scher
patent: 4199118 (1980-04-01), Tetro et al.
patent: 4286757 (1981-09-01), Wirth
patent: 4347993 (1982-09-01), Leonard
Mei San Co., Ltd.
Stodola Daniel P.
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