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Publication numberUS3868716 A
Publication typeGrant
Publication dateFeb 25, 1975
Filing dateNov 19, 1973
Priority dateNov 19, 1973
Publication numberUS 3868716 A, US 3868716A, US-A-3868716, US3868716 A, US3868716A
InventorsLippert Irving S, Stella Joseph A
Original AssigneePolaroid Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Compressed open cell foam nozzle sealing assembly
US 3868716 A
Abstract
A photographic film cassette having a processing station configured to dispense processing fluid to the film strip following exposure thereof and including a valve-like member carrying a compressed open cell foam material saturated with a coagulating chemical adapted for sealing of the processor nozzle following application of the fluid to the film strip. The foam material is located upon the sealing area of the valve and is made of a material which expands upon contact with the processing fluid causing the foam material to seal any discontinuities in the nozzle and the surrounding area. Additionally, the coagulating chemical is released upon contact with the processing fluid to further aid in the sealing function.
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Description  (OCR text may contain errors)

United States Patent Lippert et al.

COMPRESSED OPEN CELL FOAM NOZZLE SEALING ASSEMBLY Inventors: Irving S. Lippert, Lexington; Joseph A. Stella, West Peabody, both of Mass.

Polaroid Corporation, Cambridge, M ass.

Filed: Nov. 19, 1973 Appl. No.: 416,762

Assignee:

References Cited UNITED STATES PATENTS Rudolph 222/559 Batter et al. 222/559 X Feb. 25, 1975 3,785,725 1/1974 Batter et al. 352/130 X Primary ExaminerFred L. Braun Attorney, Agent, or Firm-William A. Danchuk [57] ABSTRACT A photographic film cassette having a processing station configured to dispense processing fluid to the film strip following exposure thereof and including a valve like member carrying a compressed open cell foam material saturated with a coagulating chemical adapted for sealing of the processor nozzle following application of the fluid to the film strip. The foam material is located upon the sealing area of the valve and is made of a material which expands upon contact with the processing fluid causing the foam material to seal any discontinuities in the nozzle and the surrounding area. Additionally, the coagulating chemical is released upon contact with the processing fluid to further aid in the scaling function.

31 Claims, 10 Drawing Figures PATENTED FEBZ 51975 sauna; 3

PATENTEB FEB25|975 SHEET 2 9 3 COMPRESSED OPEN CELL FOAM NOZZLE SEALING ASSEMBLY BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to photographic film cassettes and more particularly to a multipurpose film handling cassette having an improved film processing station.

2. Description of the Prior Art The present application is addressed to photographic film cassettes from which the film strip need not be removed during the exposure, processing and projection operations. Exemplary of such systems, are those described in prior US. Pat. No. 3,615,127 of Edwin H. Land issued Oct. 26, 1971; and Pat. No. 3,641,896 of Rogers B. Downey issued Feb. I5, 1972. Each of the systems described in the aforementioned patents employ a photographic film cassette which includes a processing station through which processing fluid may be applied to a film strip following its exposure. The processing fluid is initially stored within the cassette in a dispensing container from which it may be released through a nozzle onto the exposed film strip as the latter is transported there-across.

Following application of the processing fluid to the film strip, it is important to effectively control further flow of the fluid from the application system in order to prevent impairment of the film strip. Hence, in the above-noted US. Pat. No. 3,64l ,896 a closure member is displaced across the nozzle once the application of the fluid is completed. Similarly, the cassette system described in the commonly assigned patent application Ser. No. 227,092 (now US Pat. No. 3,785,725) of John F. Batter, Jr., et al., filed Feb. 17, 1972, which provides substantially automatic processing of the film in response to appropriate transport of the latter within the cassette, employs a valve-like closure member configured for displacement into blocking position across the processor nozzle following treatment of the film.

Since the nozzle structure usually includes a doctor blade element, a perfectly coplanar nozzle surface is not generally available for sealing engagement, and hence, it is difficult to completely eliminate leakage of fluid from the applicator solely with a rigid valve member. Additionally, in the processing system utilized in the aforementioned copending patent application the valve plate is laterally displaced across the nozzle surface and between it and a film engaging pressure pad so as to simultaneously close off the nozzle and to also cam the pad out of its operative position at the completion of the processing operation. Hence, during the valve displacement its leading edge is in sliding contact with portions of the nozzle surface and is thereby subjected to the possibility of catching on one of the various discontinuities in the surrounding area. In accordance with the above, and additionally since the valve is actuated by film movement such that the force available for closing theformer is limited, it is desirable to alleviate possible jamming of the valve in the nozzle opening while providing a suitable seal for the latter.

Exemplary of one way of achieving a suitable seal for the nozzle surface is that shown in U.S. Pat. No. 3,772,975 of John F. Batter, Jr., Albert Held, and J- seph A. Stella. As described and claimed in the abovenoted patent, a thin surface coating is formed on the movable valve and is displaced into contact with the nozzle to seal the processor nozzle and surrounding area. While providing an adequate seal, the employment of a thin coating surface on the movable valve lacks the thickness necessary for assuring a substantially perfect seal of the processor nozzle and the surrounding area.

Consequently, an important object of this invention is to provide an improved system for applying a pro cessing fluid to a strip of exposed photographic material.

Another primary object of this invention is to provide a film cassette having a fluid applicator system including an improved relatively inexpensive and extremely effective means for selectively sealing the latter following its operation.

A further object of this invention is to provide a film handling cassette having a fluid applicator system including a slide valve member including a compressed open cell foam material saturated with a coagulating chemical adapted for cooperation with a nozzle opening for selectively sealing the latter.

Still a further object and feature of this invention is to provide a film handling cassette having a fluid applicator system including a movable slide valve member including camming surfaces positioned thereon which prevent the slide valve from jamming as it is moved into cooperation with a nozzle opening.

SUMMARY OF THE INVENTION A multipurpose motion picture film handling cassette in accordance with the invention includes a cassette housing having an applicator system disposed therein which is configured for dispensing processing fluid to the film strip of the film handling cassette at an appropriate time during the operational program. The applicator system includes a nozzle opening which permits flow of the fluid to the film strip and includes a sealing member configured for displacement across the nozzle opening. Carried on the surface of the sealing member is a piece of compressed open cell foam material saturated with a coagulating material which interacts with the processing fluid to expand and conform to the nozzle surface and thereby provide contiguous contact therewith and a peripheral seal around its opening and into its opening once the sealing member is displaced to its closed position.

In the illustrated embodiment, the sealing member is a slide valve which is displaced across the nozzle in a plane substantially parallel to the plane of engagement with the nozzle opening and between it and a pressure pad, responsive to film movement at the completion of the processing operation. An open cell foam material located on the nozzle side of the valve is configured to become compliant and swell once it contacts the processing fluid, so as to fill any voids between the valve and the nozzle and thereby provide a complete perimetric seal around and into the nozzle opening. Contact of the open cell foam material with the processing fluid causes the coagulating material to release the foam material for expansion and absorption of processing fluid. The coagulating chemical also thickens the processing fluid and aids in the sealing function. Additionally, the valve is provided with a pair of raised portions for allowing the valve to be easily displaced across the nozzle without jamming within the nozzle itself.

3 BRIEF DESCRIPTION 'oF THE DRAWINGS The novel features that are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, both as to its structure and its operation together with the additional objects and advantages thereof will best be understood from the following description of the preferred embodiment when read in connection with the accompanying drawings wherein:

FIG. 1 is a diagrammatic plan view of a motion picture film handling cassette embodying the invention;

FIG. 2 is a fragmentary plan view of the film strip employed in the cassette shown in FIG. 1;

FIG. 3 is a plan view of the coating nozzle which forms a part of the cassette shown in FIG. 1;

FIG. 4 is a view in section of the coating nozzle taken along line 4-4 of FIG. 3;

FIG. 5 is a plan view of the sealing member employed in the cassette of FIG. 1;

FIG. 6 is a view in elevation of the sealing member shown in FIG. 3

FIG. 7 is a view partially in cross section of the applicator system of FIG. 1 showing the sealing member in its closed position; and

FIG. 8 is a greatly enlarged fragmentary view of the applicator system as shown in FIG. 7.

FIG. 9 is a further enlarged view of the applicator system of FIG. 8 with portions fragmented to more clearly show internal detail; and

, FIG. 10 is an enlarged view of a portion of the applicator system of FIG. 7.

DESCRIPTION OF THE PREFERRED EMBODIMENT The illustrated embodiment of this invention, which may be best understood by first referring to FIG. 1 of the drawings, employs a multipurpose film handling cassette 10 of the type described in the abovementioned copending patent application. The cassette 10 is configured for substantially automatic processing of the film strip responsive to appropriate transport of the latter. In this regard, the cassette of the illustrated embodiment includes an applicator system, explained in detail below, which is operable in accordance with a particular film transport program controlled by a special projector. It should be understood, however, that while the invention disclosed herein is particularly applicable to the cassette of the type described in the copending application it is not restricted to the same and may, of course, be applicable to any multipurpose film cassette.

As shown in FIG. 1, the cassette 10 comprises a generally parallelepiped casing or housing 12 constituted by planar faces or side walls 14 and 16, end walls 18 and 20, and elongated top and bottom edge walls 22 and 24. Carried within the housing 12 is a photographic film strip 26 which is permanently attached at one of its ends, as later explained in regard to FIG. 2, to a rotatable supply spool or reel 28 from which it extends within the housing 12 in an extended path around suitable rollers generally designated at 30, 32 and 34 to a take-up spool or reel 36 to which the opposite end of the film is attached. In its path within the housing 12, the film 26 extends across a normally inoperative film processing station 38, explained in detail below, and across an opening 40 which functions at different times to facilitate both exposure and projection. For facilitating the latter operation, a prism 42 is mounted behind the film strip 26 in an adjoining relation to both the opening 40 and to an illumination aperture (not shown) of the side wall 14. For a further understanding of the nature and operation of prism 42, reference should be made to U.S. Pat. No. 3,807,842 of Philip G. Baker.

In order to fully understand the operation of the cassette 10, it is advantageous to look at the strip 26 which is utilized therein and is illustrated in FIG. 2 as viewed from the outer side of the film as shown in FIG. 1. Preferably, the film strip 26 comprises a base of any suitable transparent material carrying, at least over a photographically useful length 44, an emulsion or photosensitive coating of any conventional variety as, for example, an emulsion capable of being developed by a monobath processing composition to form a positive transparency suitable for projection. A currently preferred embodiment of the invention makes use of a film structure, which, upon the base, comprises a photosensitive layer including both a photosensitive negative emulsion and an image-receiving layer to which a positive image may be transferred by diffusion during development without necessitating the subsequent removal of the emulsion containing its developed negative image. This highly desirable feature is made possible by a developed negative image having low covering power.

A composite film assembly of this type, as well as processing compositions for producing a fully developed black and white image without the necessity of removing the developed negative image after processing is shown in prior U.S. Pat. No. 2,861,885 to Edwin H. Land, which issued on Nov. 25, 1958 for Photographic Processes and Products." Other composite film assemblies capable of producing developed full color images without the necessity of removing the developed emulsion are shown in prior U.S. Pats. of Edwin H. Land, Nos. 2,726,l54, issued Dec. 6, 1955 for Photographic Product, and 2,944,894, issued July [2, 1960 for Photographic Process Utilizing Screen Members.

As shown in FIG. 2, the strip 26 includes a leader 46 terminating at an end formed with an aperture 48 which serves to connect that end of the film to the takeup spool 36. Behind the leader 46 is the strip 44 of photographically useful film upon which projectable images may be formed. Following portion 44 is a trailer region, generally designated at 50 which includes an aperture 52 by which end 50 of the film is connected to the supply spool 28. Located along one edge of the film strip 26 are a plurality of sprocket holes 54 which are configured for cooperation with a drive pawl (not shown) in either a camera or projector for incremental advancement of the film. Adjacent the trailing end 50, the seriesof sprocket holes 54 are interrupted by a first elongated sprocket hole 56 which may, for example, span two of the sprocket holes 54. Further, along the film in the direction of the supply reel end, the series of sprocket holes 54 is again interrupted by a second elongated hole 58, longer than the sprocket hole 56, and for example, spanning three of the sprocket holes 54.

As described in the aforementioned copending patent application, the first elongated sprocket hole 56 terminates the advance of the film in the camera not shown) and thereby establishes an exposure end point, whereas the second sprocket hole 58 determines a film take-up or projection end point in the projector apparatus (not shown). These different termination points are employed since it is preferred to advance the film beyond the exposure end point before applying processing composition to the exposed film, and for that purpose, a double film drive pawl (not shown) such that the film may be carried beyond the first elongated hole 56 until the second elongated hole 58 is encountered. This further advancement of the film in the projector unit is accomplished in order to bring a detent engaging element or projecting bump 60 into cooperative engagement with a pressure pad element of the processing station 38 as will be subsequently described. Additionally, the leader end 46 of the film strip 26 carries another detent engaging element, here shown as an aperture 62, which serves to actuate a valve member also forming a part of the processing station 38.

Referring again to FIG. 1, the film processing station 38 generally comprises a housing 64 having a first compartment or receptacle 66 retaining a source of processing fluid or composition 68 mounted over a second internal chamber 70 which communicates with a coating nozzle generally designated at 72.. The fluid 68 which may, for example, be an aqueous alkaline solution such is described in the aforementioned US Pat. No. 2,861,885, is initially retained with the tublike receptacle 66 by means of a tear tab 74. The tear tab 74 extends from the housing 64 to an actuating assembly generally designated at 76. The latter, as de' scribed in the aforementioned copending patent application Ser. No. 227,092 (now US. Pat. No. 3,785,725) extends beneath thesupply spool 28 to a hook-like end member 78 which is releasably latched to an upright post 80 and in engagement with a cam member 82. As will be noted in more detail below, upon insertion of the cassette into the projector (not shown) the cam 82 is appropriately displaced by a cassette-latching shaft (not shown) of the projector to drive the hook 78 from the post 80 and into engagement with one of the four teeth 84 of the supply spool 28 under the urging of a spring (not shown). Then upon subsequent rotation of the spool in the rewind direction shown by the arrow in FIG. I, the actuating assembly 76 is similarly rotated to tear the tab 74 from covering relationship with the receptacle 66 and thereby releases its fluid 68 to the nozzle 72.

Located beneath the exterior surface 86 of the nozzle 72 is a pressure pad assembly 88, which is shown in FIG. 1 in the initial position assumed upon assembly of the cassette and prior to processing. As shown, the film strip 26 normally passes between the nozzle surface 86 and the pad 88. The latter is mounted on and biased towards the nozzle surface 86 by a lcat'spring 90. and one end 92 of the pad 88 is configured to engage the base of the film 26 so as to cooperate with a protuberance 60 of the trailing end thereof as will be explained below.

As is shown more clearly in FIGS. 3 and 4, nozzle 72 includes an orifice or nozzle opening 94 enclosed by a U-shaped film engaging land or surface portion 96 and a doctor blade surface 98. The doctor blade surface 98 is slightly depressed, for example. up to 0.001 of an inch, below the substantially planar surface portion 96 and controls the thickness of the processing fluid applied during the processing operation. The blade surface 98, in conjunction with portions of the U-shaped surface 96, form the perimeter of the orifice 94 are appropriately sealed following treatment of substantially the complete length of the film strip 26. The nozzle 72 is provided at its sides with depending posts 100 and 102 which provide guidance for the film strip 26 in its path past the orifice 94 and also serve as stops for the sealing member which is described below.

Displaceably mounted in adjoining relation to the other end 104 of the pressure pad assembly 88 is a sealing member or wedge-like slide-valve 106 which is shown in greater detail in FIGS. 5 and 6. As shown therein, the valve 106 includes a substantially planar valve plate 108 formed at one end 110 with tapering sides which serve to guide the plate into a juxtaposed relation beneath the nozzle opening 94 as the plate is moved from left to right as seen in FIG. 7. When in that position, a pair of shoulders 112 and 114 cooperate with the stop posts 100 and 102 to stop the valve 106 in its closed position. Additionally provided on valve plate 108 are two raised conically shaped dimples 116 and 118, the purpose of which will be discussed below.

Carried on either side of the valve plate 108 are depending orthogonal extensions forming a pair of depending cams I20 and 122, respectively, which serve to depress the pressure pad assembly 88 away from film engagement as will be subsequently explained in regards to operation of the cassette. As shown, the cam 120 is shorter than the cam 122 in order to facilitate threading of the film strip 26 during assembly of the cassette 10. Toward the left end of the plate 108, the cam 122 forms an arm portion 124 extending substantially parallel to the plate. Integrally formed with the arm 124 is a spring arm extension 126 which engages the film 26 and is adapted to cooperate with the film aperture 62 of its trailing end so as to thereby displace the slide-valve 106 into its closed position at the completion of the initial rewind as later explained with regards to the operation of the cassette.

Carried on the valve plate 108 in proper position for cooperation with the nozzle surfaces bounding the opening 94 is a piece of sealing material 128, configured for providing a contiguous, perimetric contact around and partially within the opening following displacement of the valve 106 to its closed position shown in FIGS. 7 and 8. In a preferred embodiment of the present invention, the sealing material 128 is compressed open cell foam material saturated with a coagulating chemical then compressed dried and coated with a polyvinyl chloride coating for protecting the foam from decaying over long periods of time. The open cell foam material may be a urethane open cell foam, a polystyrene open cell foam or most any plastic open cell foam structure which may be compressed. The coagulating chemical when dried in the foam tends to retain the foam material in its compressed state until the coagulating chemical contacts the wet processing fluid. One coagulating chemical used with good results is lamino-2-sulfo-4-amino-n-butyl-anthraquinone, the structural formula for which is:

O NR

NH-C 1-1 -11 When the slide valve 106 is moved to its nozzle closure position subsequent to processing, the open cell foam comes in Contact with the remaining developer. The coagulating chemical performs two functions at this point. First, the dried coagulating chemical interacts with the wet processing fluid and physically releases the foam material from its compressed state for its expansion and absorption functions. Second, the coagulating chemical interacts with the processing fluid and actually coagulates the latter such that the mixture of the two eventually becomes a hard solid mass.

The interaction between the processing fluid, the foam material, and the coagulating chemical may be better understood by referring to FIG. 9. It is believed that when the foam material is moved into juxtaposition with the nozzle opening, the dried coagulating chemical within the foam 128 begins to interact with the excess processing fluid in an area 130 closest to the nozzle opening 94. As the coagulating material begins to interact with the fluid, it releases its holding function on foam material 128 thereby releasing the foam material for expansion. The coagulating chemical interacts with the processing fluid, thickening it within the foam material 128, thereby minimizing further penetration of the processing fluid into the foam material 128. In a time lapse sense, the area 130 of the foam has absorbed more fluid than area 132 which absorbed more fluid than the area 134. The more fluid the foam material absorbs, that is, the deeper the processing fluid penetrates, the more coagulating chemical is released thereby both further expanding the foam and slowing down the penetration of the processing fluid through the foam material 128. Note in this regard that area 130 has almost completely expanded while the area 136, adjacent plate 108, has not expanded at all. When final sealing occurs, foam material 128 has absorbed processing liquid within itself in a substantially nonlinear inverse proportional manner to the distance of a unit volume of foam material from the point of contact of the foam material 128 and the processing fluid. The nonlinear function noted above is that of a step function. As a result, absorption of the processing fluid proximate the nozzle opening is guaranteed within the foam material 128. Additionally, the foam material 128 has a high degree of expansion from its compressed state to its expanded state. Accordingly, the expanded foam is capable of efficiently filling all the discontinuities of the nozzle opening 94 as well as the area surrounding the nozzle opening and doctor blade.

An additional advantage is gained in employing the coagulating chemical to saturate the foam material. Specifically, a seal, shown generally at 138 is formed at the top of the expanded foam within the nozzle opening. This seal is a result of the chemical interaction between the coagulating chemical and the processing fluid. When dried, the combination of the processing fluid and coagulating material forms a hard relatively impenetrable seal within the nozzle area for preventing the leakage of any excess processing fluid past the foam material.

As indicated previously in this embodiment, the displacement of the slide valve to its closed position is responsive to the force of the film movement. Hence, the displacement force is of limited magnitude and it is important that the nozzle and surrounding area minimumly interferes with the movement of the valve across the nozzle surface 96. This is particularly important in the illustrated embodiment, where the slide valve 106 additionally functions to cam away the pressure pad 88, and hence, the foam 128 is forced toward the nozzle surface 96 during the valve displacement. To facilitate these requirements, the slide valve ofthe illustrated embodiment is provided with two conically shaped dimples 116 and 118. Dimples 116 and 118, as seen in FIGS. 5, 6 and 10, are of increasing height to a maximum at a point closest to foam material 128, which is slightly greater than the height of the foam material. Dimples 116 and 118 are sufficient to cam the leading edge of slide valve 106 out of jamming engagement with the surrounding nozzle area during movement of valve plate 108 subsequent to processing. The dimples 116 and 118 angle the leading edge downward to prevent its jamming. Advantageously, the dimples exceed the length of the nozzle opening, as measured in direction of film travel, so as to prevent the dimples from fully dropping into the latter. Subsequently, dimples 116 and 118 fall off the bottom of the nozzle area 140 and into a further stepped depression 141 located in the bottom area of the nozzle. Movement of dimples 116 and 118 into depression 141 both insures proper engagement of foam 128 with the general nozzle area and further acts as a locking mechanism for preventing valve plate 108 from moving back to the left as viewed in FIG. 10.

To enable a more complete understanding of the novel unit, the overall operation of the system will now be explained. As previously indicated, upon insertion of the cassette 10 into a projector (not shown) following exposure of its film, a latching-shaft (not shown) enters the cassette and depresses the cam 82 thereby releasing the pod actuating assembly 76 into spool engagement. Then, the film 26 is driven slightly further forward by the double claw (not shown) so as to bring the film protuberance 60 into contact with the end 92 of the pad 88 and thereby displace the latter to the left from its initial position shown in FIG. 1. This permits the pad 88 to spring upwardly to its operative position (not shown) under the urging of the spring 90 and thereby carry the emulsion side of the film strip 26 into coating engagement with the nozzle surface 96. Thereafter, upon initiation of film rewind, and hence, clockwise rotation of the film spool 28, the tab 74 is torn from the fluid receptacle 66 so as to release the fluid 68. The latter flows to the nozzle opening 72 and through it to the film strip 26 such that a thin layer of processing fluid is deposited on the film during the rewind operation. When the film strip 26 is substantially completely rewound onto the supply reel 28, the aperture 62 engages the arm 124 of the valve 106 and displaces the latter to the right as shown in FIG. 1 and across the nozzle opening 72 to its closed position as shown in FIG. 7. Dimples 116 and 118 cam the leading edge of plate 108 out of engagement with the nozzle area in order to facilitate and insure the movement of the valve plate 108 to its closed position.

Upon reaching its sealing location wherein its shoulders 112 and 114 are positioned against the stop and 102 of the nozzle 72, the valve foam material 128 is brought into contact with remaining portions of the fluid 68 in the area of the orifice 94 and appropriately interact with the latter to soften, partially release its coagulating material, and significantly expand so as to fill any voids existing between the valve plate 108 and the nozzle surfaces 98 and 96. As shown more clearly in FIG. 9, the foam material 128 specifically fills the depression provided by the doctor blade surface 98 and prevents any further escape of fluid at this point. Additionally, the coagulating material interacts with the processing fluid to thicken the latter and prevent maximized penetration of the open cell construction of the foam material. Additionally, sufficient coagulating material is released by the interaction of the foam material with the processing fluid to form a miniscus shaped seal within the nozzle orifice which cements the two when dried.

It will be seen that by this invention there is provided an improved photographic cassette and fluid applicator which efficiently treats photographic film following its exposure; and includes compressed open cell foam means for effectively sealing the applicator nozzle upon completion of its operation. An efficient sealing member which includes material configured for interacting with the processing fluid to coagulate and form a permanent seal of the applicator nozzle is disclosed. Further, the compressed open cell foam seal material is also adapted to cement the open cell foam sealing member in its final position.

This invention may be practiced or embodied in still other ways without departing from the spirit or essential character thereof. The preferred embodiments described herein are therefore illustrative and not restrictive. the scope of the invention being indicated by the appended claims and all variations which come within the meaning of the claims are intended to be embraced therein.

What is claimed is: 1. A film handling cassette comprising: a housing configured for retaining a strip of photographic film; t processing means including a dispensing receptacle configured to retain a quantity of processing fluid to be applied to such strip of photographic film subsequent to its exposure, said dispensing receptacle having a dispensing nozzle opening formed therein through which such processing fluid is applied to such photographic film strip; and sealing means for substantially closing said nozzle opening following dispensing of such fluid, said sealing means including a compressed open cell foam material saturated with a coagulating chemical, said compressed open cell foam material being selectively released for expansion when said compressed open cell foam is contacted by such processing fluid and said coagulating chemical interacts with said processing fluid to coagulate the same, said foam material having an area at least in conformance with the perimeter of said nozzle opening and configured to expand into substantially sealing contact with said perimeter, said chemical coagulating engaged portions of such fluid for preventing egress of such processing fluid from said nozzle opening. 2. The film handling cassette of claim 1 in which said sealing means is configured to be movably mounted proximate to said dispensing nozzle opening, said sealing means being movable between a first position in which said sealing means is in an uncovering relationship with said dispensing nozzle opening and the area surrounding the same and a-second position in which 10 said sealing means is in a covering relationship with said nozzle opening and the area surrounding the same.

3. The film handling cassette of claim 2 in which said sealing means includes a substantially planar support member, said compressed open cell foam material being interposed between said planar support member and said dispensing nozzle opening and the area surrounding the dispensing nozzle opening when said sealing means is in its said second position, said compressed open cell foam forcing itself into conformance with said dispensing nozzle opening and the area surrounding the same against said planar support member.

4. The film handling cassette of claim 2 in which said sealing means includes a substantially planar support member and ramp means formed on said support member for camming the leading edge of said support member out ofjamming contact with said dispensing nozzle opening and the area surrounding the same when said sealing means is moved between said first position and said second position.

5. The film handling cassette of claim 4 in which said ramp means are formed as a pair of conically shaped dimples on said support member positioned so as to engage said dispensing nozzle opening and the area surrounding the same before said foam material is moved into covering relationship with said dispensing nozzle opening.

6. The film handling cassette of claim 1 in which said compressed open cell foam material is formed of a material configured to selectively absorb a portion of said processing fluid such that the amount of processing fluid absorbed by said compressed open cell foam per unit volume is substantially nonlinearly inversely proportional to the distance of said unit volume from the point of contact of said foam material and said processing fluid. said compressed open cell foam material being of a material further configured to selectively release said coagulating chemical such that the amount of coagulating chemical released per unit volume of foam material is substantially nonlinearly inversely proportional to the distance of said unit volume from the point of contact of said foam material and said processing fluid.

7. The film handling cassette of claim 1 in which said compressed open cell foam material is of a material configured for selectively expanding upon contact with said processing fluid so as to expand into conformance with said dispensing nozzle opening and the area surrounding the same, the amount of expansion of said compressed open cell foam material per unit volume being substantially nonlinearly directly proportional to the distance of said unit volume from the point of contact of said compressed open cell foam material with said processing fluid.

8. The film handling cassette of claim 1 in which said open cell foam material is a piece of open cell plastic foam.

9. The film handling cassette of claim 8 in which said piece of open cell plastic foam is an open cell urethane foam.

10. The film handling cassette of claim 9 in which said open cell urethane foam is coated with polyvinyl chloride.

11. The film handling cassette of claim 9 in which said open cell urethane foam is saturated with a coagulating chemical: l-amino-2-sulfo-4-amino-nbutylanthraquinone.

12. The film handling cassette of claim 1 in which said coagulating chemical is: l-amino-2-sulfo-4-aminon-butylanthraquinone.

13. An applicator system for applying a coating of processing fluid to a strip of exposed photographic material, said applicator system comprising:

a housing including means for defining a receptacle which contains a quantity of processing fluid, said housing further including means defining a nozzle opening through which said processing fluid is applied to such strip of exposed photographic material; and

sealing means movably mounted proximate to said nozzle opening and configured for movement between a first position in which said sealing means is in an uncovering relationship with said nozzle opening and a second position in which said sealing means is in a covering relationship with said nozzle opening, said sealing means including a compressed open cell foam material saturated with a coagulating chemical which is selectively released to coagulate with said processing fluid when said compressed open cell foam material and said processing fluid are brought into contact, said compressed open cell foam being formed of a material configured to selectively expand into conformance with said nozzle opening and the perimetal area surrounding the same when said coagulating chemical and said processing fluid contact each other for preventing egress of processing fluid therefrom subsequent to movement of said sealing means into covering relationship with said nozzle opening.

14. The applicator system of claim 13 in which said sealing means includes a substantially planar support member, said compressed open cell foam material being interposed between said planar support member and said nozzle opening and the perimetal area surrounding the nozzle opening when said sealing means is in its said second position, said compressed open cell foam forcing itself into conformance with said nozzle opening and the perimetal area surrounding the same against said planar support member.

15. The applicator system of claim 13 in which said sealing means includes a substantially planar support member and ramp means formed on said support member for camming the leading edge of said planar support member out of contact with said nozzle opening and the perimetal area surrounding the same when said support member is moved between said first position and said second position for preventing any jamming engagement between said support member and the nozzle opening and the perimetal area surrounding said nozzle opening when said sealing means is being moved.

16. The applicator system of claim 15 in which said ramp means are formed as a pair of conically shaped dimples on said support member positioned so as to engage said nozzle opening and the perimetal area surrounding the same before said leading edge of said support member may contact the same.

17. The applicator system of claim 13 in which said compressed open cell foam material is formed ofa material configured to selectively absorb a portion of said processing fluid such that the amount of processing fluid absorbed by said compressed open cell foam per unit volume is substantially nonlinearly inversely proportional to the distance of said unit volume from the point of contact of said foam material and said processing fluid, said compressed open cell foam material being further configured to selectively release said coagulating chemical such that the amount of coagulating chemical released per unit volume of foam material is substantially nonlinearly inversely proportional to the distance of said unit volume from the point of contact of said foam material and said processing fluid.

18. The applicator system of claim 13 in which said compressed open cell foam material is of a material configured for selectively expanding upon contact with said processing fluid so as to expand into conformance with said nozzle opening and the perimetal area surrounding the same, the amount of expansion of said compressed open cell foam material per unit volume being substantially nonlinearly directly proportional to the distance of said unit volume from the point of contact of said compressed open cell foam material with said processing fluid.

19. The applicator system of claim 13 in which said open cell foam material is in a piece of open cell plastic foam.

20. The applicator system of claim 19 in which said piece of open cell plastic foam is an open cell urethane foam.

2]. The applicator system of claim 20 in which said open cell urethane foam is coated with polyvinyl chloride.

22. The applicator system of claim 20 in which said urethane foam is saturated with a coagulating chemical: l-amino-2-sulfo-4-amino-n-butylanthraquinone.

23. The applicator system of claim 13 in which said coagulating chemical is: l-amino-2-sulfo-4-amino-nbutylanthraquinone.

24. An applicator system for applying a coating of processing fluid to a strip of exposed photographic material, said applicator system comprising:

a housing, including means for retaining a quantity of processing fluid and means defining a nozzle opening through which said processing fluid is applied to such strip of photographic material;

means for blocking said nozzle opening subsequent to the application of such processing fluid to such strip of photographic material, said blocking means including a support member mounted for slideable displacement across said nozzle opening defining means between a first position in which said nozzle opening is unblocked and a second position in which said nozzle opening is blocked by said support means, said support means having a support member surface oriented in a direction toward said nozzle opening, and further including cam means located proximate the leading edge of said support member and extending from said support member surface toward said nozzle opening for camming said leading edge of said support member away from said nozzle opening defining means during such displacement thereby preventing the leading edge of said support member from engaging such nozzle opening and the area directly proximate thereto, whereby jamming of said support member is prevented.

25. The applicator system of claim 24 in which said cam means is formed as at least one raised ramped element located on said support member proximate said leading edge of said support member, said at least one raised ramped element being further located on one side of said support member which is moved into juxtaposition with said nozzle opening defining meanswhen said support member is displaced to its second position.

26. The applicator system of claim 24 in which said cam means is configured to fall into a discontinuity located proximate the far end of said nozzle opening as considered with respect to displacement of said support member, said cam means preventing movement of said support member from said second position to said first position when said cam means is disposed within said discontinuity.

27. The applicator system of claim 26 in which said cam means is configured as at least one ramped element having an inclined surface with a height greater at its trailing end than at its leading edge, said discontinuity being formed as a step into which said at least one ramped element is configured to fall when said support member is in said second position.

28. A sealing system for a fluid applicator which dispenses fluid through a nozzle opening formed in such applicator, said sealing system substantially closing said nozzle opening following the dispensing of such fluid, said sealing system comprising:

a support member mounted for movement from a first position in which said support member is in a substantially uncovering relationship with said nozzle opening and a second position in which said support member is in a substantially covering relationship with said nozzle opening;

compressible foam material located on said support member so as to be moved into sealing juxtaposition with said nozzle opening when said support member is in its second position so as to contact said fluid remaining proximate said nozzle opening subsequent to said fluid dispensing; and

means associated with said foam material for retain ing said foam material in a compressed state prior to contact with said fluid and releasing said foam material for expansion into said nozzle opening for sealing the same subsequent to contact with said fluid, and further, for thickening engaged portions of said fluid for preventing said fluid from passing through said foam material and exiting from said nozzle opening,

29. The sealing system of claim 28 in which said compressible foam material is an open cell urethane foam.

30. The sealing system of claim 28 in which said means associated with said foam material is a chemical with which said foam material is saturated.

31. The sealing system of claim 30 in which said chemical is a coagulating chemical: l-amino-2-sulfo-4- amino-n-butylanthraquinone.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2370997 *May 10, 1943Mar 6, 1945Rudolph Sidney JReceptacle and closure means therefor
US3772975 *Jan 2, 1973Nov 20, 1973Polaroid CorpPhotographic film cassette employing coated processor valve
US3785725 *Feb 17, 1972Jan 15, 1974Polaroid CorpProcessing composition release mechanism for film cassette comprising self-contained film processing system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4139284 *Apr 26, 1977Feb 13, 1979Polaroid CorporationFilm processing cassette containing means for absorbing excess film processing fluid
US5543884 *Feb 10, 1995Aug 6, 1996Eastman Kodak CompanyPhotographic processing chemicals
Classifications
U.S. Classification396/610, 222/559, 352/130, 222/561, 396/42
International ClassificationG03B17/26
Cooperative ClassificationG03B17/265
European ClassificationG03B17/26B