US3433566A - Cooling means for an exposure cylinder of photoprinting apparatus - Google Patents

Cooling means for an exposure cylinder of photoprinting apparatus Download PDF

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Publication number
US3433566A
US3433566A US568241A US3433566DA US3433566A US 3433566 A US3433566 A US 3433566A US 568241 A US568241 A US 568241A US 3433566D A US3433566D A US 3433566DA US 3433566 A US3433566 A US 3433566A
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United States
Prior art keywords
cylinder
air
duct
cooling
plate
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Expired - Lifetime
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US568241A
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English (en)
Inventor
Franciscus Petrus Albe Blatter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemische Fabriek L Van der Grinten NV
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Grinten Chem L V D
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Application filed by Grinten Chem L V D filed Critical Grinten Chem L V D
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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
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/14—Details
    • G03B27/26—Cooling

Definitions

  • the invention relates to a photoprinting apparatus provided with an exposure cylinder, enclosing one or more tubular copying lamps, and having an air-distributing duct with air orifices within the cylinder for internally cooling the cylinder.
  • cooling air is often supplied and propelled through the cylinder with the aid of a fan which is mounted in the vicinity of one of the ends of the cylinder.
  • a system which comprises an air-distributing duct which is mounted within the cylinder and which is coupled to a fan via a pipe system.
  • the cooling air which is supplied via such a duct spreads within the cylinder and escapes past the ends of the cylinder.
  • a construction of this kind is known in which a duct is used both ends of which 'are coupled to the fan and whose diameter regularly decreases from the ends of the middle of the duct.
  • a photocopying apparatus of the type referred to comprises an air-distributing duct having air orifices located within the cylinder, said air-distributing duct, at least for a considerable part of its entire length, in the longitudinal direction having a regularly diminishing width of passage, at its widest end being coupled to a device supplying cooling air and at its narrowest end being closed, and the cylinder being provided with an air outlet only at the end adjacent to the narrowest end of the duct.
  • the passage for the air flowing through then has nearly the same dimensions throughout, because wherever a smaller quantity of air is passing through, a narrower passage is available, and wherever a larger quantity of air is passing through, a wider passage is available.
  • the airdistributing duct may thus be of very simple construction, e.g. a substantially conical, air duct of sheet metal. Because only a small quantity of ventilating energy is necessary, the noise is insignificant.
  • the space within the cylinder is divided, by means of a substantially flat plate which is axially mounted in that space, into two compartments which communicate via slits which are left along the whole length of the plate between the edges of the plate and the wall of the cylinder, the copying lamp(s) being accommodated in one compartment, while the air-distributing duct is located in the other compartment and has as a separating wall a gradually decreasing part of the plate, in which the orifices have been provided.
  • the light is effectively screened on the operators side, on the other hand the air escapes through the slits along the wall of the cylinder towards the compartment in which the duct is located.
  • FIGURE 1 is a view of an exposure cylinder, shown in perspective and partly opened, with an air-distributing duct and a lamp mounted therein, and
  • FIGURE 2 is a longitudinal section of this cylinder and adjacent parts along the line IIII in FIGURE 1.
  • the glass cylinder 1 of a photoprinting apparatus (which is not shown further), is rotated around its axis by its contact with moving conveyer belts.
  • a lamp 2, which produces actinic light, is mounted almost in the centre of the cylinder and is fixed to the apparatus, so that it does not rotate with the cylinder.
  • a fiat plate 3 Extending alongside the lamp 2 is a fiat plate 3, which leaves a slit 4 along the inner wall on either side of the cylinder.
  • the plate 3 divides the space inside cylinder 1 into two compartments, which do not differ much in volume.
  • a row of air orifices 5 which are all the same size.
  • the slits 4 have a total width of passage which is larger than that of the orifices 5.
  • FIGURE 1 Fixed against the plate 3 is a curved plate 6, which forms part of an oblique cone, as is clearly shown in FIGURE 1.
  • this plate 6 is located throughout at a short distance along the inner wall of the cylinder 1, this distance radially having the same dimension as the slits 4. Up to its other end the plate 6 is attached to the upper edge of the plate 3, while it gradually recedes further from the lower edge of plate 3 and gradually leaves this plate free.
  • the air-distributing duct which is formed by the plates 3 and 6, is shut olT by a wall 7 (FIGURE 2).
  • FIGURE 2 supporting rolls 8 for supporting cylinder 1 are shown, which are carried by walls 9 and 10 of the apparatus. Fitted against the right wall, as seen in FIGURE 2, is the air duct of a fan 12 for cooling the cylinder.
  • the duct 11 is shaped in such a way that the fan only blows air into the duct formed by the plates 3 and 6.
  • an opening has been made in wall 9 and an air outlet duct 13 the cross-section of which is equal to that of cylinder 1 has been provided, which connects up exactly with the cylinder.
  • the device operates as follows:
  • the width of passage of the duct formed between the plates 3 and 6 is throughout amply suflicient for the quantity of air flowing through the duct, which decreases in the direction of flow of the air, whilst the air leaving this duct can flow away through a part of the cylinder whose cross-section gradually increases towards the downstream end. It has been found that in this manner it is possible to achieve a suflicient as well as an entirely even cooling of the cylinder with a small fan.
  • cooling air is only supplied via the wide end of the air-distributing duct. It has, however, been found that a particularly effective cooling, which can also be used for lamps with a very high capacity, can be achieved when cooling air is blown not only into the duct, but also directly into the cylinder end which is adjacent to the wide end of the duct. In that case a main stream of cooling air is formed, which moves axially through the cylinder compartment in which the lamp is mounted. Tangentially directed streams of fresh air are constantly added to this main stream via the holes in the duct. These streams bring about an intensive whirling of the main stream, while each of the added streams displaces a part of the main stream towards the compartment located behind the plate.
  • the main stream With its axial velocity remaining almost constant, maintains a practically equal volume and a practically equal temperature, owing to which very oven cooling is achieved, which moreover is very effective owing to the whirling of the main stream.
  • the quantity of air which is displaced towards the compartment behind the plate gradually increases on its way to the outlet end. However, as it gets gradually more space to flow through, owing to the decreasing cross-section of the duct, this air can easily escape.
  • photoprinting apparatus comprising an exposure cylinder adapted to enclose tubular copying lamp means extending longitudinally inside the cylinder and means for blowing cooling air into one end of said cylinder, its other end being open for the passage of air therefrom, means inside said cylinder for distributing the air inflow substantially evenly about and along the region of said cylinder occupied by said lamp means and then passing the air out of said other end, comprising an air duct having a mouth at said one end to take in at least part of said air inflow and extending lengthwise of said cylinder and, through at least a major part of its length, progressively diminishing in cross-sectional passage area in the direction toward said other end, said duct being provided with orifice means opening laterally therefrom into said region and distributed substantially evenly therealong for delivering said at least part of said air inflow into said region substantially evenly over the length thereof.
  • said air duct being located to one side and said lamp means to the other side of the space inside said cylinder, said air blowing means being aligned with said one end of said cylinder so as to supply a part of said air inflow into the mouth of said duct and another part of said air inflow directly into and along the regions of said cylinder occupied by said lamp means.
  • said air distributing means further including partition means dividing the space inside said cylinder longitudinally into two compartments, said lamp means being in one of said compartments and said duct being in the other, said partition means having upper and lower edges thereof spaced from the wall of said cylinder to provide therealong slits for passing air from said one compartment into the other.
  • said partition means comprising a substantially flat plate disposed axially in said space and forming a Wall of said duct, said orifice means comprising a series of openings formed in and along a portion of said plate near to one of said edges.
  • said duct being further formed by an elongate transverse curved plate having a substantially conical shape, said curved plate being fixed to said substantially flat plate so as to encompass said openings and with its wider end forming said mouth at said one end of said cylinder, its narrower end being closed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US568241A 1965-08-02 1966-07-27 Cooling means for an exposure cylinder of photoprinting apparatus Expired - Lifetime US3433566A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6510002A NL6510002A (enrdf_load_stackoverflow) 1965-08-02 1965-08-02

Publications (1)

Publication Number Publication Date
US3433566A true US3433566A (en) 1969-03-18

Family

ID=19793792

Family Applications (1)

Application Number Title Priority Date Filing Date
US568241A Expired - Lifetime US3433566A (en) 1965-08-02 1966-07-27 Cooling means for an exposure cylinder of photoprinting apparatus

Country Status (6)

Country Link
US (1) US3433566A (enrdf_load_stackoverflow)
BE (1) BE684876A (enrdf_load_stackoverflow)
CH (1) CH450168A (enrdf_load_stackoverflow)
GB (1) GB1126279A (enrdf_load_stackoverflow)
NL (1) NL6510002A (enrdf_load_stackoverflow)
SE (1) SE329334B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936672A (en) * 1973-08-06 1976-02-03 Minolta Camera Kabushiki Kaisha Illumination device for copying machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299474A (en) 1979-12-26 1981-11-10 International Business Machines Corporation Component mounting apparatus useful for compact copiers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2196400A (en) * 1938-11-29 1940-04-09 Schwarzmayr Ludwig Motion picture light beam protecting system
CA522411A (en) * 1956-03-06 O. Trump Frederick Printing lamp and cylinder cooling means
US2821126A (en) * 1955-03-28 1958-01-28 Dit Mco Inc Motion picture projection booth and lamp house ventilator
US2979986A (en) * 1957-03-28 1961-04-18 Paromel Electronics Corp Picture projecting device
US3307465A (en) * 1964-06-01 1967-03-07 Frederick Post Co Light-printing apparatus
US3329076A (en) * 1963-06-26 1967-07-04 Admel Internat Ltd Photocopying machines
US3361047A (en) * 1964-06-17 1968-01-02 Grinten Chem L V D Photo-printing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA522411A (en) * 1956-03-06 O. Trump Frederick Printing lamp and cylinder cooling means
US2196400A (en) * 1938-11-29 1940-04-09 Schwarzmayr Ludwig Motion picture light beam protecting system
US2821126A (en) * 1955-03-28 1958-01-28 Dit Mco Inc Motion picture projection booth and lamp house ventilator
US2979986A (en) * 1957-03-28 1961-04-18 Paromel Electronics Corp Picture projecting device
US3329076A (en) * 1963-06-26 1967-07-04 Admel Internat Ltd Photocopying machines
US3307465A (en) * 1964-06-01 1967-03-07 Frederick Post Co Light-printing apparatus
US3361047A (en) * 1964-06-17 1968-01-02 Grinten Chem L V D Photo-printing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936672A (en) * 1973-08-06 1976-02-03 Minolta Camera Kabushiki Kaisha Illumination device for copying machine

Also Published As

Publication number Publication date
SE329334B (enrdf_load_stackoverflow) 1970-10-05
NL6510002A (enrdf_load_stackoverflow) 1967-02-03
GB1126279A (en) 1968-09-05
DE1497431B2 (de) 1975-11-13
BE684876A (enrdf_load_stackoverflow) 1967-02-01
DE1497431A1 (de) 1969-06-04
CH450168A (de) 1968-01-15

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