Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Patent
1998-10-30
2000-01-25
Jillions, John M.
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Cartridge system
2423484, G03B 2302
Patent
active
060169842
ABSTRACT:
A spoolless film takeup chamber with a pair of expandable film coiling springs. The springs are flat springs coiled generally in a spiral configuration. The thickness of the springs varies from the point at which the springs are attached to the inner takeup chamber out to the free, distal ends of the springs such that the thickness at the distal end is less than the thickness at end attached to chamber. Preferably the thickness decreases continuously from the attached ends to the distal ends of the spring. The effect is to reduce the spring rate at the outer ends of the springs thereby maintaining a relatively constant spring force on the film as the diameter of the film coil grows as compared to springs with a constant spring rate along the length of the springs. Additionally, the radius of curvature of a segment of each spring at the distal end is longer than the radius of curvature at an intermediate segment of the spring to better conform the spring to the outer circumference of the film coil thereby avoiding interference between the ends of the springs and features on the film such as perforations.
REFERENCES:
patent: 1694401 (1928-12-01), Slocum
patent: 1799184 (1931-04-01), Slocum et al.
patent: 2236917 (1941-04-01), Pollock
patent: 2336278 (1943-12-01), Mihalyi
patent: 2484248 (1949-10-01), Roehrl
patent: 3276341 (1966-10-01), Kremp et al.
patent: 3288388 (1966-11-01), Winkler
patent: 3288389 (1966-11-01), Gersch et al.
patent: 3322366 (1967-05-01), Hayden
patent: 3333785 (1967-08-01), Baur et al.
patent: 3715963 (1973-02-01), LeCover
patent: 3823891 (1974-07-01), Schrader
patent: 4060210 (1977-11-01), Norris
patent: 4166588 (1979-09-01), Krehbiel et al.
patent: 4482232 (1984-11-01), Engelsmann et al.
patent: 5385317 (1995-01-01), Yamamoto et al.
patent: 5746388 (1998-05-01), Raimondi, Jr.
Miller John F.
Trafton R. Winfield
Boos, Jr. Francis H.
Eastman Kodak Company
Jillions John M.
LandOfFree
Spoolless film takeup chamber with improved spooling spring does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spoolless film takeup chamber with improved spooling spring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spoolless film takeup chamber with improved spooling spring will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2310962