EP0581543B1 - Photographic film processor with two film transport speeds - Google Patents
Photographic film processor with two film transport speeds Download PDFInfo
- Publication number
- EP0581543B1 EP0581543B1 EP19930305840 EP93305840A EP0581543B1 EP 0581543 B1 EP0581543 B1 EP 0581543B1 EP 19930305840 EP19930305840 EP 19930305840 EP 93305840 A EP93305840 A EP 93305840A EP 0581543 B1 EP0581543 B1 EP 0581543B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- drive means
- station
- speed
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
- G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
- G03D3/08—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material
- G03D3/13—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material for long films or prints in the shape of strips, e.g. fed by roller assembly
- G03D3/132—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material for long films or prints in the shape of strips, e.g. fed by roller assembly fed by roller assembly
Definitions
- This invention relates to a film processor for processing photographic film in elongate strip form.
- Film processors comprise a plurality of processing stations, a plurality of drive rollers which define a film processing path through the processing stations and drive means for rotating the rollers to transport film along the path, the final processing station being a drying station and the penultimate processing station being a washing station. If the drive rollers of all the processing stations are driven at a constant speed there is no need to couple different transport speeds. Where there is a need to couple film to different transport speeds, it is common practice to use a "slack box", but that introduces complications.
- An object of this invention is to provide a film processor which can be operated with a balance between the various conflicting requirements discussed above.
- a film processor for processing photographic film in elongate strip form, the processor comprising a plurality of processing stations, drive means which are operable to transport the film along a film processing path through the processing stations, the final processing station being a drying station and the penultimate processing station being a washing station, wherein the drive means comprises first drive means provided for transporting the film through each of the processing stations that precedes the washing station and for feeding the film into the washing station at one speed and second slower drive means independent of said first drive means provided for withdrawing the film from the washing station at another speed which is slower than said one speed. That obviates the need for an intermediate film store since the film can be left in the washing station without disadvantage.
- the second slower drive means also is operable to transport film withdrawn from the washing station to the drying station.
- the second slower drive means may be arranged so that the film is introduced into the drying station at a speed which is fractionally slower than the speed of a transfer web by which it is transported through the drying station. Thus snagging of the film as it is transferred into the drying station is avoided.
- a preferred embodiment of this invention includes a plurality of drive rollers which are drivingly rotated by said respective drive means to transport the film along the path, wherein a first clutch is provided which is operable to rotate the drive rollers of the preceding processing stations, and to drivingly couple the drive rollers of the washing station to said first drive means which are operable to rotate the drive rollers of the preceding processing stations, and to decouple the same, and a second clutch is provided for drivingly coupling said second drive means to the drive rollers of the washing station when the latter are decoupled from said first drive means.
- the film processor illustrated in Figure 1 is a mini-lab colour film processor machine of the kind described and illustrated in PCT International Patent Publication No. WO90/08981.
- the machine has six similar, individually mounted modular tanks 10 to 15, each containing a different processing solution.
- each tank 10 to 15 there is a so-called 'rack mechanism', generally indicated at 16, which is operable to circulate a length of film along its length around a closed-loop path immersed in the respective processing solution for a predetermined number of times.
- the time taken to circulate the film around the closed loop path for the predetermined number of times is substantially the optimum time for the film to be immersed in the developer solution.
- a switch mechanism is actuated to deflect the film out of the closed loop path and to direct it to a film transfer mechanism generally indicated at 18 by which it is fed out of the tank and into the next tank where it is taken up by the rack mechanism 16 of that next tank and circulated around the respective closed loop path in that tank for the predetermined number of times.
- the rack mechanisms 16 of all the tanks 10 to 15 are driven by a common drive shaft 20 so that the film is moved at a constant speed within and between the tanks 10 to 15. Since the film can be circulated within each tank 10 to 15 for several circuits of the closed loop path, the speed can be fast so that the time taken for transfer through air between juxtaposed tanks 10 to 15 is minimised. It will be understood that the time the film spends immersed in the processing solution in each tank 10 to 15 is not dependent solely upon its speed but also on the number of times it is cycled around the tank and that can be set independently of setting the speed.
- the rack mechanism 16 of the first tank which is the developer tank 10 is described in more detail by way of example. It comprises a pair of driven rollers 21 and 22 journalled in support structure so as to rotate one above the other. They are driven by the common drive mechanism of the processor machine, which is illustrated in Figure 2 and which includes the common drive shaft 20. Film introduced into the machine for processing is fed by appropriate input feed means 23 through an aperture 24 and directed between the upper driven roller 21 and a co-operating squeegee nip roller 25 by which it is directed towards the lower driven roller 22. The film is passed between a lower squeegee nip roller 26 and the lower roller 22, around the lower roller 22 and between the lower roller 22 and another squeegee nip roller 27.
- the switch mechanism 17 is provided near to the last mentioned squeegee nip roller 28. It has two settings. In the first setting it directs the film around the upper driven roller 21 to be fed downwards to the lower driven roller 22 between the cooperating squeegee nip roller 25 and the upper driven roller 21.
- FIG. 2 shows that the drive shaft 20 has five worms 31 at spaced intervals thereon.
- a main drive motor 32 drives the drive shaft 20 through a belt drive 33.
- Each worm 31 meshes with a respective worm wheel 34 by which motion is transmitted from the drive shaft 20 to a respective one of the switch racks 16 of the developer tank 10, the bleach tank (11 and the next three tanks 12 to 14, motion so transmitted by the intermeshed worms 31 and worm wheels 34 to the respective switch racks being synchronised.
- Motion is transmitted from each worm wheel 34 to the respective switch rack 16 by rotation of a shaft 34A to which the worm wheel 34 is fixed, the shaft 34A being drivingly coupled by suitable gearing with the upper and lower driven rollers 21 and 22 of the respective switch rack 16.
- the worms 31, the worm wheels 34, the shaft 34A and the gearing are similar so that each switch rack is driven at the same speed.
- An electro-magnetic clutch 35 couples the main drive shaft 20 to a shorter, coaxial shaft 36 which carries two further worms 37.
- the worm 37 nearer to the electromagnetic clutch 35 meshes with a worm wheel 38 which is drivingly connected to the switch rack 16 of the last tank 15 which is a washing station.
- the other worm 37 meshes with a worm wheel 39 which is drivingly coupled to transfer drive rollers 40 (see Figure 1) operable to transport film from the washing tank 15 to an infra-red film dryer 43 in a drying station of the film processor.
- the dryer 43 forms the subject of the co-pending patent application which designates the priority of British Patent Application No. 9216334.4 filed 31 July 1992.
- the worms 37 and worm wheels 38 and 39 are respectively of the same size as the worms 31 and worm wheels 34 and the transfer drive rollers 40 are the same size as the rollers 21 and 22 of the switch racks 16 driven by the meshing worms 31, 37 and worm wheels 34,38,39.
- Another electromagnetic clutch 41 couples the end of the shorter shaft 36 remote from the electromagnetic clutch 35 to another drive motor 42.
- the motor 32 drives the main drive shaft 20 to transport a length of film through the five processing stations provided by the five tanks 10 to 14 with which the five worm wheels 34 are associated.
- the clutches 35 and 41 are de-energised so that the shorter shaft 36 is disconnected from both the main drive shaft 20 and the motor 42 whilst the film is being transported through those tanks 10 to 14, but the web transport of the infra-red dryer 43 is driven to prevent it overheating.
- the clutch 35 is energised so that the shorter shaft 36 is coupled to the main drive shaft 20.
- the film is transferred into the washing tank 15 from the tank 14 at the speed at which it has been drawn through all the preceding tanks 10 to 14. It is also circulated within water in the washing station by drive transmitted from the main drive shaft 20 through the clutch 35 to the shorter shaft 36 and through the intermeshing worm 37 and worm wheel 38 and the shaft 38A on which the worm wheel 38 is fixed, to the respective switch rack mechanism 16.
- the electromagnetic clutch 35 is de-energised so that the shorter shaft 36 is decoupled from the main drive shaft 20 and the film comes to a stop in the washing tank 15.
- the other clutch 41 is then energised to couple the other motor 42 to the shorter shaft 36.
- the other motor 42 is arranged to drive the shaft 36 at a slower speed than the speed by which it was driven when coupled to the main drive shaft 20.
- the film is withdrawn from the washing tank 15 by the transfer drive rollers 40 that are driven by the intermeshing worm 37 and worm wheel 39 at the desirable slower speed which results in the squeegeeing action on the film being better than it would be if it had been withdrawn at the higher speed at which the shaft 36 is driven by the main drive shaft 20, and with the result that it has less water sticking to it.
- the other motor 42 also drives the transport rollers 40 so that they feed the film onto the transport web of the infra-red film dryer 43 at a speed which is fractionally slower than the speed of the transport web, thus avoiding the film snagging the rest of the transport web.
- the film processor incorporates control means by which the sequential operation of the clutches 35 and 41 and the motor 42 as described above is controlled automatically.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photographic Processing Devices Using Wet Methods (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
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Description
- This invention relates to a film processor for processing photographic film in elongate strip form.
- Film processors comprise a plurality of processing stations, a plurality of drive rollers which define a film processing path through the processing stations and drive means for rotating the rollers to transport film along the path, the final processing station being a drying station and the penultimate processing station being a washing station. If the drive rollers of all the processing stations are driven at a constant speed there is no need to couple different transport speeds. Where there is a need to couple film to different transport speeds, it is common practice to use a "slack box", but that introduces complications.
- The faster film is withdrawn from water in the washing station, the more water sticks to it. It is better to withdraw film from water in a washing station slowly so that the amount of water it carries is minimised. It is also desirable to transfer the film straight from washing station to drying station because it could start to dry and get sticky if it is left in air between the two.
- An object of this invention is to provide a film processor which can be operated with a balance between the various conflicting requirements discussed above.
- According to this invention there is provided a film processor for processing photographic film in elongate strip form, the processor comprising a plurality of processing stations, drive means which are operable to transport the film along a film processing path through the processing stations, the final processing station being a drying station and the penultimate processing station being a washing station, wherein the drive means comprises first drive means provided for transporting the film through each of the processing stations that precedes the washing station and for feeding the film into the washing station at one speed and second slower drive means independent of said first drive means provided for withdrawing the film from the washing station at another speed which is slower than said one speed. That obviates the need for an intermediate film store since the film can be left in the washing station without disadvantage.
- Preferably the second slower drive means also is operable to transport film withdrawn from the washing station to the drying station. The second slower drive means may be arranged so that the film is introduced into the drying station at a speed which is fractionally slower than the speed of a transfer web by which it is transported through the drying station. Thus snagging of the film as it is transferred into the drying station is avoided.
- A preferred embodiment of this invention includes a plurality of drive rollers which are drivingly rotated by said respective drive means to transport the film along the path, wherein a first clutch is provided which is operable to rotate the drive rollers of the preceding processing stations, and to drivingly couple the drive rollers of the washing station to said first drive means which are operable to rotate the drive rollers of the preceding processing stations, and to decouple the same, and a second clutch is provided for drivingly coupling said second drive means to the drive rollers of the washing station when the latter are decoupled from said first drive means.
- One embodiment of this invention will be described now by way of example with reference to the accompanying drawings of which:
- Figure 1 is a diagram illustrating a film processor in which this invention is embodied; and
- Figure 2 is a diagram illustrating the drive arrangement of the film processor shown in Figure 1 in more detail.
- The film processor illustrated in Figure 1 is a mini-lab colour film processor machine of the kind described and illustrated in PCT International Patent Publication No. WO90/08981.
- The machine has six similar, individually mounted
modular tanks 10 to 15, each containing a different processing solution. In eachtank 10 to 15, there is a so-called 'rack mechanism', generally indicated at 16, which is operable to circulate a length of film along its length around a closed-loop path immersed in the respective processing solution for a predetermined number of times. The time taken to circulate the film around the closed loop path for the predetermined number of times is substantially the optimum time for the film to be immersed in the developer solution. When the film has been so cycled for the predetermined number of times, a switch mechanism, generally indicated at 17, is actuated to deflect the film out of the closed loop path and to direct it to a film transfer mechanism generally indicated at 18 by which it is fed out of the tank and into the next tank where it is taken up by therack mechanism 16 of that next tank and circulated around the respective closed loop path in that tank for the predetermined number of times. Therack mechanisms 16 of all thetanks 10 to 15 are driven by acommon drive shaft 20 so that the film is moved at a constant speed within and between thetanks 10 to 15. Since the film can be circulated within eachtank 10 to 15 for several circuits of the closed loop path, the speed can be fast so that the time taken for transfer through air between juxtaposedtanks 10 to 15 is minimised. It will be understood that the time the film spends immersed in the processing solution in eachtank 10 to 15 is not dependent solely upon its speed but also on the number of times it is cycled around the tank and that can be set independently of setting the speed. - The
rack mechanism 16 of the first tank which is thedeveloper tank 10 is described in more detail by way of example. It comprises a pair of drivenrollers common drive shaft 20. Film introduced into the machine for processing is fed by appropriate input feed means 23 through anaperture 24 and directed between the upper drivenroller 21 and a co-operatingsqueegee nip roller 25 by which it is directed towards the lower drivenroller 22. The film is passed between a lowersqueegee nip roller 26 and thelower roller 22, around thelower roller 22 and between thelower roller 22 and anothersqueegee nip roller 27. It is then returned to the upper drivenroller 21, being fed between that drivenroller 21 and yet anothersqueegee nip roller 28. Theswitch mechanism 17 is provided near to the last mentionedsqueegee nip roller 28. It has two settings. In the first setting it directs the film around the upper drivenroller 21 to be fed downwards to the lower drivenroller 22 between the cooperatingsqueegee nip roller 25 and the upper drivenroller 21. In the alternative setting to which it is switched when the film has been cycled around the two drivenrollers developer tank 10, it deflects the film away from the upper drivenroller 21 directly upwards to be fed into thefilm transfer mechanism 18 by which it is passed out through an outlet aperature of thedeveloper tank 10, through a gate and shield arrangement (not shown) and into thenext tank 11, which is a bleach tank, being directed towards therack mechanism 16 mounted therein. - Figure 2 shows that the
drive shaft 20 has fiveworms 31 at spaced intervals thereon. Amain drive motor 32 drives thedrive shaft 20 through abelt drive 33. Eachworm 31 meshes with arespective worm wheel 34 by which motion is transmitted from thedrive shaft 20 to a respective one of the switch racks 16 of thedeveloper tank 10, the bleach tank (11 and the next threetanks 12 to 14, motion so transmitted by the intermeshedworms 31 andworm wheels 34 to the respective switch racks being synchronised. Motion is transmitted from eachworm wheel 34 to therespective switch rack 16 by rotation of ashaft 34A to which theworm wheel 34 is fixed, theshaft 34A being drivingly coupled by suitable gearing with the upper and lower drivenrollers respective switch rack 16. Theworms 31, theworm wheels 34, theshaft 34A and the gearing are similar so that each switch rack is driven at the same speed. An electro-magnetic clutch 35 couples themain drive shaft 20 to a shorter,coaxial shaft 36 which carries twofurther worms 37. Theworm 37 nearer to theelectromagnetic clutch 35 meshes with aworm wheel 38 which is drivingly connected to theswitch rack 16 of thelast tank 15 which is a washing station. Theother worm 37 meshes with aworm wheel 39 which is drivingly coupled to transfer drive rollers 40 (see Figure 1) operable to transport film from thewashing tank 15 to an infra-red film dryer 43 in a drying station of the film processor. Thedryer 43 forms the subject of the co-pending patent application which designates the priority of British Patent Application No. 9216334.4 filed 31 July 1992. Theworms 37 andworm wheels worms 31 andworm wheels 34 and thetransfer drive rollers 40 are the same size as therollers meshing worms worm wheels - Another
electromagnetic clutch 41 couples the end of theshorter shaft 36 remote from theelectromagnetic clutch 35 to anotherdrive motor 42. - In operation of the film transport arrangement illustrated in the drawings, the
motor 32 drives themain drive shaft 20 to transport a length of film through the five processing stations provided by the fivetanks 10 to 14 with which the fiveworm wheels 34 are associated. Theclutches shorter shaft 36 is disconnected from both themain drive shaft 20 and themotor 42 whilst the film is being transported through thosetanks 10 to 14, but the web transport of the infra-red dryer 43 is driven to prevent it overheating. - As the film nears the end of its process time in the
tank 14 which immediately precedes thewashing tank 15, theclutch 35 is energised so that theshorter shaft 36 is coupled to themain drive shaft 20. As a result the film is transferred into thewashing tank 15 from thetank 14 at the speed at which it has been drawn through all the precedingtanks 10 to 14. It is also circulated within water in the washing station by drive transmitted from themain drive shaft 20 through theclutch 35 to theshorter shaft 36 and through the intermeshingworm 37 andworm wheel 38 and theshaft 38A on which theworm wheel 38 is fixed, to the respectiveswitch rack mechanism 16. - When the predetermined process time for the film in the
washing tank 15 has elapsed, theelectromagnetic clutch 35 is de-energised so that theshorter shaft 36 is decoupled from themain drive shaft 20 and the film comes to a stop in thewashing tank 15. Theother clutch 41 is then energised to couple theother motor 42 to theshorter shaft 36. Theother motor 42 is arranged to drive theshaft 36 at a slower speed than the speed by which it was driven when coupled to themain drive shaft 20. Hence the film is withdrawn from thewashing tank 15 by thetransfer drive rollers 40 that are driven by theintermeshing worm 37 andworm wheel 39 at the desirable slower speed which results in the squeegeeing action on the film being better than it would be if it had been withdrawn at the higher speed at which theshaft 36 is driven by themain drive shaft 20, and with the result that it has less water sticking to it. Theother motor 42 also drives thetransport rollers 40 so that they feed the film onto the transport web of the infra-red film dryer 43 at a speed which is fractionally slower than the speed of the transport web, thus avoiding the film snagging the rest of the transport web. - When all the film has been transferred from the
washing tank 15 to the transport web of the infra-red film dryer 43, theother motor 42 is switched off and theother clutch 41 is de-energized to decouple theshorter shaft 36 from theother motor 42. Thus the apparatus is ready for processing another length of film. - It will be understood that the film processor incorporates control means by which the sequential operation of the
clutches motor 42 as described above is controlled automatically.
Claims (4)
- A film processor for processing photographic film in elongate strip form, the processor comprising a plurality of processing stations (10 to 15 and 43), drive means (32 and 42) which are operable to transport the film along a film processing path through the processing stations (10 to 15 and 43), the final processing station (43) being a drying station and the penultimate processing station (15) being a washing station, characterised in that the drive means (32) comprises first drive means provided for transporting the film through each of the processing stations (10 to 14) that precedes the washing station (15) and for feeding the film into the washing station (15) at one speed and second slower drive means (42) independent of said first drive means (32) provided for withdrawing the film from the washing station (15) at another speed which is slower than said one speed.
- A film processor according to claim 1, wherein the second drive means (42) also is operable to transport film withdrawn from the washing station (15) to the drying station (43).
- A film processor according to claim 2, wherein the second drive means (42) is arranged so that the film is introduced into the drying station (43) at a speed which is fractionally slower than the speed of a transfer web by which it is transported through the drying station (43).
- A film processor according to any one of claims 1 to 3, including a plurality of drive rollers (21, 22, 40) which are drivingly rotated by said respective drive means (32, 42) to transport the film along the path, wherein a first clutch (35) is provided which is operable to drivingly couple the drive rollers (21 and 22) of the washing station (15) to said first drive means (32) which are operable to rotate the drive rollers (21 and 22) of the preceding processing stations (10 to 14), and to decouple the same, and a second clutch (41) is provided for drivingly coupling said second drive means (42) to the drive rollers (21 and 22) of the washing station (15) when the latter are decoupled from said first drive means (32).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/265,599 US5493360A (en) | 1992-07-27 | 1994-06-24 | Film processor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9215957 | 1992-07-27 | ||
GB929215957A GB9215957D0 (en) | 1992-07-27 | 1992-07-27 | A film processor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0581543A1 EP0581543A1 (en) | 1994-02-02 |
EP0581543B1 true EP0581543B1 (en) | 1996-11-06 |
Family
ID=10719382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19930305840 Expired - Lifetime EP0581543B1 (en) | 1992-07-27 | 1993-07-23 | Photographic film processor with two film transport speeds |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0581543B1 (en) |
JP (1) | JPH06233975A (en) |
CA (1) | CA2101120A1 (en) |
DE (1) | DE69305797T2 (en) |
GB (1) | GB9215957D0 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0933678A1 (en) * | 1998-01-30 | 1999-08-04 | Agfa-Gevaert N.V. | Apparatus for the liquid processing of sheet material |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2706913C3 (en) * | 1977-02-18 | 1980-03-06 | Basf Ag, 6700 Ludwigshafen | Device for handling printing plates produced by photochemical processes |
US4300828A (en) * | 1980-07-14 | 1981-11-17 | Pako Corporation | Photosensitive sheet processor |
US4673251A (en) * | 1985-12-18 | 1987-06-16 | Pako Corporation | Apparatus and method for transporting photosensitive sheets in a photoprocessor |
DE3833733A1 (en) * | 1988-10-04 | 1990-04-05 | Agfa Gevaert Ag | METHOD AND DEVICE FOR COUPLING DIFFERENT MACHINES FOR PROCESSING TAPE-SHAPED, LIGHT-SENSITIVE PHOTOGRAPHIC MATERIALS |
JP2875883B2 (en) * | 1989-02-01 | 1999-03-31 | イーストマン・コダック・カンパニー | Processing equipment |
-
1992
- 1992-07-27 GB GB929215957A patent/GB9215957D0/en active Pending
-
1993
- 1993-07-22 CA CA 2101120 patent/CA2101120A1/en not_active Abandoned
- 1993-07-23 DE DE1993605797 patent/DE69305797T2/en not_active Expired - Fee Related
- 1993-07-23 EP EP19930305840 patent/EP0581543B1/en not_active Expired - Lifetime
- 1993-07-27 JP JP18472693A patent/JPH06233975A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE69305797T2 (en) | 1997-05-22 |
GB9215957D0 (en) | 1992-09-09 |
CA2101120A1 (en) | 1994-01-28 |
EP0581543A1 (en) | 1994-02-02 |
DE69305797D1 (en) | 1996-12-12 |
JPH06233975A (en) | 1994-08-23 |
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