Claims
- 1. A method of manufacturing a photographic film cassette, said method comprising the steps of:
- providing a pair of shell halves which comprise a cassette shell, each of said pair of shell halves of said cassette shell having confining elements formed on an inner periphery of said cassette shell, and a film passage mouth formed between said shell halves
- providing a spool which is rotatably mounted in said cassette shell
- providing a pair of flexible flanges and mounting said pair of flexible flanges on opposite ends of said spool;
- inserting said spool inside said shell halves in a lighted environment with said flanges mounted to said spool so that said confining members press said flanges at circumferential portions thereof;
- mating said shell halves together to form said cassette shell;
- separating said shell halves in an unlighted environment to widen said film passage mouth to an extent that said confining elements still press said flanges at said circumferential portions thereof;
- providing a length of photographic film having a trailing end and a leading end, and inserting said trailing end of a strip of said photographic film through said widened film passage mouth toward said spool;
- securing said trailing end of said photographic film to said spool;
- subsequently mating said shell halves together again;
- winding said photographic film into said cassette shell by rotating said spool in a winding direction so that a roll of photographic film is tightly wound on said spool; and
- pressing said flexible flanges, using said confining members against planar end surfaces of said photographic film roll, such that said flexible flanges deform while pressing said roll, to prevent loosening of said roll.
- 2. A method as recited in claim 1, further comprising the step of securing said shell halves to each other after said winding step.
- 3. A method as recited in claim 2, wherein each of said flanges has a curved rim which is in contact with an outermost convolution of said roll at a limited lateral portion thereof so as to radially confine the outermost convolution.
- 4. A method as recited in claim 3, wherein said separating step comprises the step of pivoting at least one of said shell halves about a pivot which is located outside said cassette shell and extends parallel to a rotational axis of said spool in a plane including said rotational axial and axial joint surfaces of said mated shell halves.
- 5. A method as recited in claim 4, wherein said confining elements are in contact with said flanges by an amount L when said shell halves are separated, and the amount L is not less than 0.3 mm under conditions that the external diameter of said flanges is 21.2 mm, the radial distance from said pivot to said rotational axis is 14 mm, the radial distance from said rational axis to an inner end of said confining elements is 8 mm, and the radius of curvature of said rim of said flange is 0.2 mm.
Priority Claims (3)
Number |
Date |
Country |
Kind |
4-206653 |
Aug 1992 |
JPX |
|
4-272987 |
Oct 1992 |
JPX |
|
4-326982 |
Dec 1992 |
JPX |
|
Parent Case Info
This is a Continuation of application Ser. No. 08/542,715, filed Oct. 13, 1995, now abandoned which in turn is a division of application Ser. No. 08/100,966, filed Aug. 3, 1993, which is now U.S. Pat. No. 5,479,691, issued on Jan. 2, 1996.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0082675 |
Dec 1982 |
EPX |
63-4036 |
Feb 1988 |
JPX |
2222946 |
Sep 1990 |
JPX |
3182451 |
Aug 1991 |
JPX |
9004254 |
Apr 1990 |
WOX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
100966 |
Aug 1993 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
542715 |
Oct 1995 |
|