Sensing amount of medium and medium roll malfunction in a printe

Details Sensing amount of medium and medium roll malfunction in a printe Sensing amount of medium and medium roll malfunction in a printe

1988-04-25

1990-05-15

Matecki, Katherine A.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

B65H 1712

Patent

active

049251210

ABSTRACT:
An optical detector senses the teeth on a wheel rotating with an unwinding roll of medium in a printer and provides a signal which is used to count the sensed teeth to measure the rotation of the roll. When a predetermined proportion of a rotation is completed, the measured length of medium movement along a path through the printer during the predetermined proportion of a rotation is used to sense the condition of the medium. The conditions which may be sensed include amount of medium, medium thickness and medium malfunction. The circumference may, for example, be calculated and compared with a low medium circumference for the preselected or calculated thickness of the medium to detect a low medium condition. Periodically, the present medium position may be compared with its position when the last tooth was detected to sense a medium malfunction, either a medium out condition or a medium break. The teeth are triangular and shaped to provide a slowly varying signal from the optical detector which is converted to a purely digital signal by a high hysteresis Schmitt Trigger device. The processor which receives the digital signal also receives a signal indicating the length of medium movement.

REFERENCES:
patent: Re30868 (1982-02-01), Mori
patent: 3281634 (1966-10-01), Studer
patent: 3898436 (1975-08-01), Pottebaum et al.
patent: 3958735 (1976-05-01), Wanat
patent: 4021002 (1977-05-01), Meihofer
patent: 4040043 (1977-08-01), Stanford
patent: 4089482 (1978-05-01), Mooney et al.
patent: 4097726 (1978-06-01), Satoh et al.
patent: 4151403 (1979-04-01), Woolston
patent: 4159572 (1979-07-01), Nunes
patent: 4204180 (1980-05-01), Usui et al,
patent: 4213575 (1980-07-01), Firth, III et al.
patent: 4239404 (1980-12-01), Defilipps et al.
patent: 4291843 (1981-09-01), Yanagawa
patent: 4337903 (1982-07-01), Kessler et al.
patent: 4456193 (1984-06-01), Westover
patent: 4463913 (1985-08-01), Sato
patent: 4473009 (1984-09-01), Morgan
patent: 4491430 (1985-01-01), Kuelzer
patent: 4525654 (1985-06-01), Tajima
patent: 4535949 (1985-08-01), Olsson
patent: 4631682 (1986-12-01), Ng et al.
patent: 4728987 (1988-03-01), Diola et al.

Affiliated with

Also associated with

Rating

Sensing amount of medium and medium roll malfunction in a printe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sensing amount of medium and medium roll malfunction in a printe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensing amount of medium and medium roll malfunction in a printe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-616934