Paper winding device for photographic printer

Details Paper winding device for photographic printer Paper winding device for photographic printer

1997-07-07

1998-08-18

Nguyen, John Q.

Winding, tensioning, or guiding

Unwinding and rewinding a machine convertible information...

Intermediate storage

2423327, 242333, 2424132, 242357, G11B 1556, G03B 158, G03B 2143

Patent

active

057948690

ABSTRACT:
A paper winding device for winding up photographic paper after exposure on a take-up spool in a photographic printer. A loop forming portion for storing exposed portion of the photographic paper in the form of a loop is disposed before the take-up spool. The take-up spool is rotated by a DC motor which is activated or inactivated depending on the amount of the loop. A paper guide arm is provided to confine the outermost convolution of the paper roll wound on the take-up spool. An angle detector detects the inclination of the paper guide arm to determine the paper roll diameter. The DC motor is dynamically braked after inactivated, and resistance value or braking time for dynamic braking of the DC motor is changed in accordance with the paper roll diameter, to reduce variation in paper winding amount with paper roll diameter in the delay time from the inactivation to the actual stop of the DC motor.

REFERENCES:
patent: 3310250 (1967-03-01), Michiels et al.
patent: 3341141 (1967-09-01), Jura et al.
patent: 3785588 (1974-01-01), Schramm
patent: 3908923 (1975-09-01), Salgo
patent: 3982710 (1976-09-01), Teumer
patent: 4225098 (1980-09-01), Henkler et al.
patent: 4663573 (1987-05-01), Maetani et al.

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