US1270302A - Developing apparatus for photographic films. - Google Patents

Description

R. KROEDEL.

DEVELOPING APPARATUS FOR PHOTOGRAPHIC FILMS.

v APPLlCATION FILED APR.26.1917.

2 SHEETS-SHEET I.

7%; ATTORNEYS Patented June 25, 1918.

INVQVTOR [Zoeri rvedel/ I WITNESSES.-

R. KROEDEL.

DEVELOPING APPARATUS FOR PHOTOGRAPHIC F ILMS.

APPLICATION FILED APR. 26, 1917.

1,270,302. Patented June 25, 1918.

2 SHEETS-SHEET 2.

his ATTORNEYS UNITED STATES PATENT OFFICE.-

ROBERT KROEDEL, OF ROCHESTER, NEW YORK, ASSI GNOR TO EASTMAN KODAK COM- PANY, OI ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

DEVELOPING APPARATUS FOR PHOTOGRAPHIC FILMS.

Specification of Letters Patent.

Patented June 25, 1918.

Application filed April 28, 1917. Serial No. 184,664.

To all whom it may concern:

Be it known that I, ROBERT KROEDEL, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Developing Apparatus for Photographic Films; and Ido hereby declare the following to be a full, clear, and exact descriptibn of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals nfarked thereon.

. the ordinary roll film cartridge of commerce though features thereof are applicable to the development of film strips generally. To these and other ends the invention resides in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a top plan view of a developing device constructed in accordance with and illustrating one embodiment of my invention;

Fig. 2 is a side view thereof;

Fig. 3 is a bottom plan view of the film supporting member with a film strip in place therein;

Fig. 4: is a bottom plan View of the film supporting member with the film removed and the roll holding box removed;

Fig. 5 is a side view of the film supportin member;

ig. 6 is an enlarged longitudinal central section taken vertically through the device with the center portion thereof broken away;

Fig. 7 is a transverse sectional view taken substantially on the line 7-7 of Fig. 6;

Fig. 8 is a transverse sectional view taken substantially on the line 88 of Fig. 6, and

Fig. 9 is an end view of the film supportin member.

@imilar reference numerals throughout the several views indicate the same parts.

In the present embodiment of the invention, the apparatus is made mainly of wood, preferably suitably treated with oil or wax block and this concavit to reduce its absorptive characteristics. It comprises two major parts, a long rectangular shallow tray 1 and an elongated film supporting member or block 2 fitting within the tray. The member 2 has a reduced portion 3 at one end adjacent to a semi-cylindric-al concavity 4 in the end face of the is adapted to receive a film roll woun on the usual film spool 5. The roll is held within the concav ity by a detachable box 6 that fits telescopically over the reduced portion 3 and provides a light-tight roll holdin chamber 7 at this end of the film supporting member. Shoulders 8 at the base of the reduced portion 3- define the correct position of the box 6. At its opposite end the film support 2 is provided with a receding or inclined end face 9 that engages under an undercut end Wall 10 of the tray 1. The support 2 is inserted in the tray by first engaging its end 9 in the undercut portion 10 and then lowering the opposite end to position. rangement tends to lock the two parts. together, prevents the ready entrance of light to the bottom of the tray and further serves as a clamping means for the free end of a film strip as will be later described.

Communicating with the roll holdin chamber 7 are two inclined guides 11 forme by converging flanges or shoulders 12 on the bottom of the film supporting member This arl 2. Between and above the guides the memher 2 is hollowed out by the formation of a channel 13 on its under side that extends the length thereof with the exception of solid portions 14 and 15 at respective ends that provide short lengths of wall opposed in spaced relation to the walls 12 of the film guides 11. A tortuous passage 16 extending longitudinally and transversely through the member 2 terminates at the top or upper face of the member in a pour opening 17 and at its other or lower end in a discharge opening 18 that delivers to the channel 13 and permits developing liquid to be introduced therein without admitting any appreciable amount of light.

In using the device, the box 6 is'removed and the film roll, consisting of the film strip 19 and the backing strip 20, is inserted in the concavity 4. The box is then replaced to properly confine the roll after leading the outer or advance end of the film and its backing into the guides 11. The strips are film 19 is disposed from end to end of the support 2 and below the channel 13 and the extremity of the backing strip 20 is brought around, as shown in Fig. 6 and clamped between the undercut wall 10 of the tray and the end face 9 of the support as the latter is inserted in the former. The bottoms of the guides 11 are separated a distance less than the width of the film strip for which the device is adapted and as before stated, these guides are inclined downwardly with the result that the film is held by its edges only in a downwardl curved position as best shown in Fig. 7 he tension of the strips when thus distorted holds them tightl m the guides against the entrance of light rom below and provides a curved bottom for the channel 13; The loading of the film into the device is accomplished in a dark room but the further operations may be performed in the light.

The developing fluid is now poured into the opening 17 and through the passage 16 to the channel 13 which it fills in direct contact with the upper sensitized surface of the film 19 which latter is thus developed, a rocking motion preferably being communicated to the tray, as usual.

The solid portions 14: and 15 at the ends of the channel 13 serve to prevent the stretched film strip from sagging downward or doubling sufiiciently to become detached from the guides, particularly when inserting the support 2 in the tray 1 and it will be notedthat during the process of developing, the sensitive or emulsion surface of the film is turned upward with the body of developer above it so that there is little tendency for air bubbles to adhere thereto.

I claim as my invention:

1. In a roll film. developing apparatus, the combination with a support provided with film retaining guides and a roll holding box detachably cooperating with one end of the support to form a roll holding chamber com- 'municating with said guides, of a developing tray adapted to receive the support and to retain the roll holding box in place thereon.

2. In a roll film developing apparatus, the combination with a support provided with film retaining guides and a roll holding box detachably coiiperating with one end of the support to form a roll holding chamber communicating with said guides, the opposite end of the support havin an inclined face, of a developing tray a apted to receive the support and to retain the roll holdingbox in place thereon, one end of the tray being provided With an undercutwall to lock against the inclined end face of the support.

3. In a roll film developing apparatus, the combination with a developing tray, of a film supporting member therein having film retainin devices on its under side and provided with a tortuous passage opening at its top through which developer may be poured upon the film.

4. In a roll film developing apparatus, the

combination with a developing tray, of a film.

supporting member therein having parallel film guides on its under side adapted to hold a film strip by its edges and a channel above and between the guides, said member being provided with a tortuous passage opening at its top and communicating with the channel g1 permit developer to be poured upon the 5. In a film roll developing apparatus, a

ROBERT KROEDEL.

Witnesses:

HELEN M. FRASER, MARGARET DUIGNAN.

Images