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2010-11-01T03:02:35Z
2010-12-10T16:49:34+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0334324-A2-19890927
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EP-0334324-A2-19890927
In a film cassette (1), a film spool (5) is rotatable independently of a pair of coaxially spaced disks (51, 53). The two disks (51, 53) have respective annular circumferential lips (59, 61) which prevent the outermost leader convolution (47) of a film roll (37) wound on the spool core (23) from clock-springing into contact with the cassette shell (3). When the spool core (23) is initially rotated, the disks (51, 53) can remain substantially stationary and the film roll (37), since its inner end (39) is secured to the spool core, tends to expand radially to ensure a non-slipping relation between the outermost leader convolution (47) and the circumferential lips (59, 61). Then, rotation of the spool core (23) must rotate the disks (51, 53) and stationary internal spreaders (65, 67) will deflect successive portions (59′, 61′) of the lips (59, 61) to an axial dimension exceeding the film width, thereby allowing corresponding portions of the outermost leader convolution (47) to exit from the radial confinement of the lips. Stationary internal guides (73, 75) direct the freed forward end (45) of the outermost leader convolution (47) to the cassette opening (25). Sufficient film thrust is provided by the spool core (23) as it is rotated, to thread the film leader (43) along a predetermined path from the cassette opening (25), to the outside of the cassette shell (3).
In a film cassette (1), a film spool (5) is rotatable independently of a pair of coaxially spaced disks (51, 53). The two disks (51, 53) have respective annular circumferential lips (59, 61) which prevent the outermost leader convolution (47) of a film roll (37) wound on the spool core (23) from clock-springing into contact with the cassette shell (3). When the spool core (23) is initially rotated, the disks (51, 53) can remain substantially stationary and the film roll (37), since its inner end (39) is secured to the spool core, tends to expand radially to ensure a non-slipping relation between the outermost leader convolution (47) and the circumferential lips (59, 61). Then, rotation of the spool core (23) must rotate the disks (51, 53) and stationary internal spreaders (65, 67) will deflect successive portions (59′, 61′) of the lips (59, 61) to an axial dimension exceeding the film width, thereby allowing corresponding portions of the outermost leader convolution (47) to exit from the radial confinement of the lips. Stationary internal guides (73, 75) direct the freed forward end (45) of the outermost leader convolution (47) to the cassette opening (25). Sufficient film thrust is provided by the spool core (23) as it is rotated, to thread the film leader (43) along a predetermined path from the cassette opening (25), to the outside of the cassette shell (3).
en
European Patent Office
EP0334324
EP 0334324
G03B 17/30
Film cassette
Film cassette - European Patent Office - EP 0334324 A2
Film cassette - European Patent Office - EP 0334324 A2
Adobe PDF Library 8.0
"EP0334324"; "EP 0334324"; "G03B 17/30"; "Film cassette"
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1
B
8
EP
0334324
A2
1989-09-27
89105141
1989-03-22
US
173396
1988-03-25
G03B 17/30
EASTMAN KODAK COMPANY (a New Jersey corporation)
Fraser, Mark David, Eastman Kodak Company
Robertson, Jeffrey Charles Eastman Kodak Company
Film cassette
Filmkassette
Film cassette
Cassette pour films
In a film cassette (1), a film spool (5) is rotatable independently of a pair of coaxially spaced disks (51, 53). The two disks (51, 53) have respective annular circumferential lips (59, 61) which prevent the outermost leader convolution (47) of a film roll (37) wound on the spool core (23) from clock-springing into contact with the cassette shell (3). When the spool core (23) is initially rotated, the disks (51, 53) can remain substantially stationary and the film roll (37), since its inner end (39) is secured to the spool core, tends to expand radially to ensure a non-slipping relation between the outermost leader convolution (47) and the circumferential lips (59, 61). Then, rotation of the spool core (23) must rotate the disks (51, 53) and stationary internal spreaders (65, 67) will deflect successive portions (59′, 61′) of the lips (59, 61) to an axial dimension exceeding the film width, thereby allowing corresponding portions of the outermost leader convolution (47) to exit from the radial confinement of the lips. Stationary internal guides (73, 75) direct the freed forward end (45) of the outermost leader convolution (47) to the cassette opening (25). Sufficient film thrust is provided by the spool core (23) as it is rotated, to thread the film leader (43) along a predetermined path from the cassette opening (25), to the outside of the cassette shell (3).
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