Method and apparatus for controlling tension on a sheet material

Details Method and apparatus for controlling tension on a sheet material Method and apparatus for controlling tension on a sheet material

1994-10-28

1996-06-25

Wiecking, David A.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400236, 400249, 242334, 2424123, 2424132, B41J 3352

Patent

active

055294103

ABSTRACT:
A method and apparatus for controlling tension on a sheet material in a reel-to-reel transport system. The sheet material is feed along a defined path from a supply reel to a take-up reel. A motor is operatively connected to the take-up reel for applying a torque to the take-up reel while a sensor is positioned to detect rotation of the supply reel. A microcontroller enables the motor with an initial PWM pwm.sub.o to create torque on the take-up reel and then incrementally increases the PWM. When the sensor indicates that the supply reel has moved, the current PWM is stored in memory as pwm.sub.i. This pwm.sub.i is subsequently used by the apparatus to determine a desired tension on the thermal ribbon.

REFERENCES:
patent: 4448366 (1984-05-01), Fludzinski
patent: 4513229 (1985-04-01), Kudelski
patent: 4788558 (1988-11-01), Caldwell et al.
patent: 4949761 (1990-11-01), Gibson-Saxty
patent: 4977466 (1990-12-01), Nakata
patent: 5267401 (1993-12-01), Freeman et al.
patent: 5300953 (1994-04-01), Schulte
patent: 5330118 (1994-07-01), Yoshikawa
patent: 5367471 (1994-11-01), Nguyen et al.

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