US3263587A - Holder for originals to be printed, particularly in automatic photographic printing machines - Google Patents

Holder for originals to be printed, particularly in automatic photographic printing machines Download PDF

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Publication number
US3263587A
US3263587A US351629A US35162964A US3263587A US 3263587 A US3263587 A US 3263587A US 351629 A US351629 A US 351629A US 35162964 A US35162964 A US 35162964A US 3263587 A US3263587 A US 3263587A
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US
United States
Prior art keywords
plate
conduit means
original
printed
window
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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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US351629A
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English (en)
Inventor
Mey Hansjuerg
Bertele Juergen
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Gretag AG
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Gretag AG
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/62—Holders for the original
    • G03B27/6271—Holders for the original in enlargers
    • G03B27/6285—Handling strips
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/62—Holders for the original
    • G03B27/64—Holders for the original using a vacuum or fluid pressure

Definitions

  • Holders for this purpose should the so constructed that the original to be printed can be changed as rapidly as possible and that there is no risk of damage to the original.
  • the first of these two requirements is of particularly great importance because in modern automatic machines the exposure times are very short and therefore the total printing time depends to a very great extent on the time required for changing the negative.
  • Hitherto proposed negative holders generally consist of a clamping device including a plate adapted to be pressed against the film gate, the latter and the plate being provided with mask apertures which coincide in the closed position. It is a relatively complicated and lengthy procedure to insert the originals into these known clamping devices. In addition, there is always a danger that the original will be damaged.
  • a holder for a photographic original suitable for holding the original to be printed in an automatic photographic printing machine, wherein the holder is in the form of a plate with a window corresponding in size to the original, there being, mean-s for locating the original in register with the window, and wherein the plate is formed with internal passages having outlets adjacent, said window and an inlet or inlets connectable to a source of suction, whereby the application of suction to said inlet(s) will serveto hold an. original to be printed against the plate.
  • the plate is formed with a manifold for said "passages and a common inlet to the manifold sothat the application of suction to the plate is simplified.
  • film gate is constructed as a suction plate, the changing of the originals is substantially simplified and the risk of damage during the operations of insertion, clamping, and removal is practically eliminated.
  • FIGURE 1 shows diagrammatically a holder for a photographic original to be printed and a control mechanism for operating the holder
  • FIGURE 2 shows the time plan of the control mechanism
  • FIGURE 3 is a circuit diagram of an electrical control device
  • FIGURE 4 is a plan view of the holder
  • FIGURE 5 a section on the line VV in FIGURE 4.
  • the holder and control mechanism of the present invention may be incorporated in automatic photographic printing machines of the most diverse construction, or may be added to such machines without any considerable expense. Machines of this type are known in themselves. In this connection reference is for example made to the machine described in French patent specification No. 1,253,479. The drawing and the description .below are therefore restricted to the holder, its pneumatic system, and an electrical control device, while features of the actual automatic photographic printing machine are mentioned only where this is necessary for the understanding of the present invention.
  • a film gate is formed by a plate 1 and a film guide is formed by bolts 7 let into the plate, which has a rectangular window 2, forming a mask aperture.
  • the plate is formed with a manifold 3 from which passages 5 have their outlets around the window 2.
  • the manifold 3 is connected to a pneumatic system, which in FIGURE 1 is designated generally by P, through an inlet pipe 4.
  • the pneumatic system P includes a vacuum vessel 9 incorporated in a branch pipe 11 connecting the suction side of a pump 8 and the passages 5 or manifold 3 by way of pipe 4.
  • the volume of this vessel 9 is so designed that at a given vacuum it can absorb at least the quantity of air which is required for a first phase of the suction operation.
  • the connecting pipe between the pump 8 and the vessel 9 is provided with a check valve 30.
  • a pipe 10 by-passes the vacuum vessel 9 whereby the pump 8 can be directly connected to the suction plate 1 through the pipes 10 and 4.
  • Magnetic valves 12 and13 or the like are provided both in the branch pipe 11 between the vessel 9 and the plate 1 and in the by-pass pipe 10. These valves can be controlled by a pressure switch 14 on the plate side thereof in such a manner that when a negative pressure, which can be adjusted previously on said pressure switch, is reached, the valve 12 in the branch pipe 11 is closed and the valve 13 in the by-pass pipe 10 is opened.
  • the opening time of the valve 12 disposed in the branch pipe 11 can be at least additionally limited by a time impulse generator.
  • vent valve 15 is connected to the pipe 4' leading to the inlet 4.
  • This vent valve is also constructed as a magnetic valve or the like having an opening time limited by a time impulse generator.
  • Monostable multivibrators which are known in themselves may for example be used as time pulse generators.
  • FIGURE 2 shows in the section marked a the switching timing (open-closed) of the magnetic valve 12 disposed in the branch pipe 11.
  • the section marked b showsthe corresponding time-pressure relationship in the suction passages 5 and at the pressure switch 14 respectively.
  • the section marked 0 shows the appertaining timing of the position of the vent valve 15.
  • the section marked d shows the switching condition (open-closed) of the magnetic valve 13 contained in the by-pass pipe 10.
  • FIGURE 2 symbolise the direction of the functioning.
  • valve 13 in the by-pass pipe is opened and remains open as long as the pressure is below the threshold V stipulated by the pressure switch.
  • valve 13 may be made to open only when the pressure switch responds shortly before valve 12 closes again.
  • the two magnetic valves 12 and 13 are automatically closed after the period of time T The full operation of the vacuum vessel 9 is thereby avoided.
  • vent valve 15 is opened.
  • the original can be removed or replaced by another original, whereupon the above-described operation can be repeated.
  • the removal of the film during the opening of the vent valve 15 is particularly effective if the negative is inserted so that its emulsion side is facing the suction plate.
  • a mirror or similar reversing means must be provided in the path of the illuminating rays of the printing machine.
  • FIGURE 1 The lifting of the original off the suction plate (after the exposure has been made) can be improved if the passages 5 or 3 can be connected optionally to the pressure side of the air suction pump 8.
  • FIGURE 1 Two further magnetic valves 17a and 17b and a pressure reduction valve 18 are disposed on the pressure branch 16 of the pump 8. These two valves 17a and 17b are so controlled that in the event of exposure not occurring and/or in the event of suction not being effected, the pressure in branch 16 of the pump 8 will act on the suction plate 1.
  • an air cushion will be formed which will lift the original off the film gate and hold it suspended to a certain extent.
  • FIGURE 1 The pneumatic system outlined in FIGURE 1 is best ried out as follows.
  • a switch-on order arriving through a line 19 in the form of an impulse of positive current (of any desired magnitude and form) is conducted through the diode 20 to a monostable multivibrator 22 (time impulse generator) which is thereby operated.
  • an impulse of the time duration T (FIGURE 2) occurs at the output of the multivibrator 22.
  • This impulse passes directly to the control winding of the magnetic valve 12 in the branch pipe 11 (FIGURE 1) and to the control winding of the magnetic valve 13 in the by-pass pipe 10 (FIGURE 1) through a diode 21, and furthermore feeds an exposure lamp 23 of the automatic photographic printing machine through a diode 29.
  • the valves 12 and 13 are thereby opened at the same time and the exposure lamp 23 is switched on.
  • the current supply to the lamp 23 is maintained through a contact 24.
  • FIGURES 4 and 5 show a preferred form of construction of the suction plate.
  • the passages 5 and manifold 3 are here formed by corresponding apertures or bores.
  • An original to be printed' is indicated by 6.
  • the suction plate is preferably madeof transparent or m-att white material (such as that known under the Registered trade mark Plexiglas), so that with the aid of suitable illuminating means not only the negative to be printed but also the surrounding film areas can be made visible. This is important not only when the negative number corresponding to the image has to be read, but also when the negative to be printed next must be examined in advance in order to make the necessary adjustments.
  • the negative can in a simple manner he placed either lengthwise or crosswise as desired, depending on the position corresponding to the particular positive format.
  • the passage mouths are preferably distributed over all (four) sides of the mask aperture boundary.
  • it is generally sutficient to provide suction points only on the mask edges lying transversely to the direction of the film.
  • Means for holding a photographic original to enable the latter to be printed in an automatic photographic printing machine comprising a plate intended to receive the original, portions in said plate defining a window aperture of a size corresponding to that of the original to be printed, means on said plate for locating the original in register with the window, portions in said plate defining an internal manifold surrounding said window, portions in said plate defining outlet passages leading from said manifold to locations adjacent said window, portions in said plate defining an inlet passage leading to said manifold, a suction pump, first conduit means connected to said inlet in said plate, second conduit means connecting said first conduit means with said suction pump, a vacuum vessel inserted in said second conduit means, a first magnetic valve also inserted in said second conduit means between said vacuum vessel and said inlet, third conduit means connecting said suction pump and said first conduit means and by-passing said second conduit means, a second magnetic valve in said third conduit means a pressure switch connected to said first conduit means and operable to control said first and second magnetic valves in a manner such that,
  • Means for holding a photographic original to enable the latter to be printed in an automatic photographic printing machine comprising a plate intended to receive the original, portions in said plate defining a window aperture of a size corresponding to that of the original to be printed, means on said plate for locating the original in register with the window, portions of said plate defining an internal manifold surrounding said window, portions in said plate defining outlet passages leading from said manifold to locations adjacent said window, portions in said plate defining an inlet passage leading to said manifold, a suction pump, first conduit means connected to said inlet in said plate, second conduit means connecting said first conduit means with said suction pump, a vacuum vessel inserted in said second conduit means, a first magnetic valve also inserted in said second conduit means between said vacuum vessel and said inlet, third conduit means connecting said suction pump and said first conduit means and by-passing said second conduit means, a second magnetic valve in said third conduit means, a pressure switch connected to said first conduit means and operable to control said first and second magnetic valves in a manner such that
  • time impulse 2 generator is a mono-stable multivibrator.
  • Means for holding a photographic original to enable the latter to be printed in an automatic photographic printing machine comprising a plate intended to receive the original, portions in said plate defining a window aperture of a size corresponding to that of the original to be printed,
  • a suction pump for locating the original in register with the window, portions in said plate defining an internal manifold surrounding said window, portions in said plate defining outlet passages leading from said manifold to locations adjacent said window, portions in said plate defining an inlet passage leading to said manifold, a suction pump, first conduit means connected to said inlet in said plate, second conduit means connecting said first conduit means with said suction pump, a vacuum vessel inserted in said second conduit means, a first magnetic valve also inserted in said second conduit means between said vacuum vessel and said inlet, third conduit means connecting said suction pump and said first conduit means and bypassing said second conduitmeans, a second magnetic valve in said third conduit means, a pressure switch connected to said first conduit means and operable to control said second magnetic valve in a manner such that, when a'negative pressure which is preadjustable on said pressure switch is reached, said second magnetic valve is opened, a time impulse generator for limiting the opening time of said first magnetic valve, a vent valve connected to said first conduit means, and a time impulse generator
  • vent valve is a magnetic valve
  • time impulse generators are mono-stable multivi-brators
  • Means for holding a photographic original to enable the latter to be printed in an automatic photographic printing machine comprising a plate intended to receive the original, portions in said plate defining a window aperture of a size corresponding to that of the original to be printed, mean-s on said plate for locating the original in register with the window, portions in said plate defining an internal manifold surrounding said window, portions in said plate defining outlet passages leading from said manifold to locations adjacent said window, portions in said plate defining an inlet passage leading to said manifold, a suction pump, first conduit means connected to said inlet in said plate, second conduit means connecting said first conduit means with said suction pump, a vacuum vessel inserted in said second conduit means, a first magnetic valve also inserted in said second conduit means between said vacuum vessel and said inlet, third conduit means connecting said suction pump and said first conduit means and thy-passing said second conduit means, a second magnetic valve in said third conduit means a pressure switch connected to said first conduit means and operable to control said first and second magnetic valves in a
  • valve means in said fourth conduit means includes a reduction valve and magnetic valves.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Projection-Type Copiers In General (AREA)
US351629A 1963-03-15 1964-03-13 Holder for originals to be printed, particularly in automatic photographic printing machines Expired - Lifetime US3263587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH328363A CH412572A (de) 1963-03-15 1963-03-15 Halterung für die Kopiervorlagen in insbesondere automatischen Kopiergeräten

Publications (1)

Publication Number Publication Date
US3263587A true US3263587A (en) 1966-08-02

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US351629A Expired - Lifetime US3263587A (en) 1963-03-15 1964-03-13 Holder for originals to be printed, particularly in automatic photographic printing machines

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US (1) US3263587A (en, 2012)
BE (1) BE645155A (en, 2012)
CH (1) CH412572A (en, 2012)
GB (1) GB1037093A (en, 2012)
NL (1) NL6402651A (en, 2012)
SE (1) SE302249B (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353647A (en) * 1981-01-08 1982-10-12 Western Litho Plate & Supply Company Apparatus for exposing and conveying photosensitive plates

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55146442A (en) * 1979-05-02 1980-11-14 Fuji Photo Film Co Ltd Film focal plane holder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614470A (en) * 1949-02-05 1952-10-21 Printing Engineers Inc Lamphouse for printing apparatus
US2826976A (en) * 1954-07-22 1958-03-18 Joseph Gelb Company Vacuum frame apparatus
US3028786A (en) * 1959-02-04 1962-04-10 Robertson Photo Mechanix Inc Vacuum frame for use in making color separations
US3104585A (en) * 1955-08-22 1963-09-24 Western Blue Print Co Apparatus for making improved reproductions of indicia

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614470A (en) * 1949-02-05 1952-10-21 Printing Engineers Inc Lamphouse for printing apparatus
US2826976A (en) * 1954-07-22 1958-03-18 Joseph Gelb Company Vacuum frame apparatus
US3104585A (en) * 1955-08-22 1963-09-24 Western Blue Print Co Apparatus for making improved reproductions of indicia
US3028786A (en) * 1959-02-04 1962-04-10 Robertson Photo Mechanix Inc Vacuum frame for use in making color separations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353647A (en) * 1981-01-08 1982-10-12 Western Litho Plate & Supply Company Apparatus for exposing and conveying photosensitive plates

Also Published As

Publication number Publication date
NL6402651A (en, 2012) 1964-09-16
BE645155A (en, 2012)
GB1037093A (en) 1966-07-27
SE302249B (en, 2012) 1968-07-08
CH412572A (de) 1966-04-30

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