Daylight film developing tank

Claim 2

A daylight developing tank of roll films, comprising a tank body including a cylindrical portion and a radial extension; a cylindrical spool rotatably engageable with the cylindrical portion of the body and having a plurality of separate, vertically spaced, horizontal, annular film-holding grooves circumferentially formed on the peripheral outer surface of the spool, the circumference of the spool being at least the same in length as films being developed, the film-holding groove engaging only upper and lower edges of a single length of film: a cover including a circular portion and a radial projection engageable with the cylindrical portion and the radial extension of the tank respectively, in a light-interrupting manner at the top thereof, said cover having an aperture rotatably engageable with the spool; a plurality of cassette holders secured to the lower surface of the radial projection of the cover so that when the cover and spool are so engaged the holders extend various distances along the outer surface of the spool so as to dispose cassettes adjacent to respective film-holding grooves, and a plurality of film retainers, each being mounted on the filmholding groove for retaining the outermost end of the film from the corresponding cassette carried by the cassette holder.

Claim 3

A daylight developing tank according to claim 1, wherein said spool has a knob integrally formed therewith and extending through the aperture of the cover in a rotatable manner.

Claim 4

A daylight developing tank according to claim 1, wherein said film retAiners are made of resilient lug members, so as to urge the outermost end of each film being developed against the outer surface of the film-holding groove.

Claim 5

A daylight developing tank according to claim 1, wherein said cover has a vertical light-interrupting wall integrally formed along the periphery thereof, and the body has another light-interrupting wall integrally formed with the peripheral wall thereof at the uppermost edge thereof so as to cooperate with light-interrupting wall of the cover, for defining a dark chamber receiving the film being developed.

Claim 6

A daylight developing apparatus for roll films, comprising a tank for containing developer including a cylindrical portion and a radial extension; a cylindrical spool coaxially and rotatably engageable with the cylindrical portion of the tank in the interior thereof and having a plurality of independent film-holding grooves circumferentially formed on the periphery of the spool, each of said independent grooves being arranged substantially in parallel with each other with an axial space therebetween and having a circumference substantially the same as the length of the film to be developed, each of said grooves having such configuration in its axial section as to engage only the side edges of the film; a cover including a circular portion and a radial projection engageable respectively with the cylindrical portion and the radial extension of the tank in a light-interrupting manner at the top thereof, said cover having an aperture rotatably engageable with the spool; a plurality of film cassette holders secured to the lower surface of the radial projection of the cover so as to dispose each of the film cassettes adjacent the corresponding film-holding groove when the cover is mounted on the tank; and a plurality of film retainers, each being mounted in a film-holding groove for retaining the leading edge of the film in the corresponding film cassette carried by the film cassette holder.

Claim 7

A daylight developing apparatus for roll films, comprising a tank for containing developer including a cylindrical portion and a radial extension; a cylindrical spool coaxially and rotatably engageable with the cylindrical portion of the tank in the interior thereof and having a plurality of independent film-holding grooves circumferentially formed on the periphery of the spool, each of said independent grooves being arranged substantially in parallel with each other with an axial space therebetween and having a circumference substantially the same as the length of the film to be developed, each of said grooves having such configuration in its axial section as to engage only the side edges of the film; a cover including a circular portion and a radial projection engageable respectively with the cylindrical portion and the radial extension of the tank in a light-interrupting manner at the top thereof, said cover having an aperture rotatably engageable with the spool; a plurality of film cassette holders secured to the lower surface of the radial projection of the cover so as to dispose each of the film cassettes adjacent the corresponding film-holding groove when the cover is mounted on the tank; and a plurality of film retainers, each being mounted in a film-holding groove for retaining the leading edge of the film in the corresponding film cassette carried by the film cassette holder.