ULTRAVIOLET LAMP HOUSING

• US 3,819,929 A
• Filed: 06/08/1973
• Issued: 06/25/1974
• Est. Priority Date: 06/08/1973
• Status: Expired due to Term

• Current Assignee: Henry C. Newman
• Original Assignee: Henry C. Newman
• Inventors: Newman, Henry C.
• Primary Examiner(s): Moses, Richard L.
• Application Number:
  US05/368,438
• Time in Patent Office: 382 Days
• Field of Search: 240/41.37,41.35R,44.1,51.11R,13B,47 355/71,30,101 350/289
• US Class Current: 362/218
• CPC Class Codes: B41F 23/0409 Ultraviolet dryers
• CPC Class Codes: F21V 14/04 by movement of reflectors in vehicle head lamps F21S41/675
• CPC Class Codes: F21V 14/08 by movement of the screens or filters
• CPC Class Codes: F21V 17/02 with provision for adjustment F21V17/04 - F21V17/08 take precedence
• CPC Class Codes: F21V 29/56 using liquid coolants F21V29/51 takes precedence

Abstract

An ultraviolet lamp housing has side and end walls defining a relatively elongated lamp enclosure having an elongated opening at one side, in the operative position of the housing. An elongated ultraviolet lamp is mounted between the end walls. A pair of elliptical reflector sections are mounted in the enclosure for rotation about axes extending in spaced parallel relation to the lamp. The reflector sections have a first closed position in which they form an elliptical reflector having a first focus at the lamp and a second focus at the plane of the opening, and have a second closed position in which they are interposed between the lamp and the opening. The side of the lamp enclosure opposite to the opening is formed with a coolant duct and a heat sink is mounted in this duct and displaceable coordinate with the reflector sections. In the first closed position of the reflector sections, the heat sink is disposed in spaced relation to the closed reflector sections and toward the outer side of the coolant duct. In the second closed position of the reflector sections, the heat sink is moved inwardly to form an inner wall of the coolant duct. In another embodiment of the invention, the heat sink may be stationary and form the inner wall of the duct and, in this case, conduits for the flow of liquid coolant are superposed on the heat sink for extracting the heat of the lamp enclosure.

Claims

1. A housing for an ultraviolet lamp, comprising, in combination, side and end walls defining a relatively elongated lamp enclosure having an elongated opening at one side thereof;

an elongated ultraviolet lamp mounted in said end walls;

a pair of elliptical reflector sections mounted in said enclosure for rotation about respective axes extending in spaced parallel relation to said lamp;

drive means operable to rotate said reflector sections between a first open reflector position in which they form an elliptical reflector having a first focus at said lamp and a second focus at the plane of said opening, and a second closed shutter position in which they are interposed between said lamp and said opening, and vice versa; and

lamp enclosure cooling means at the opposite side of said lamp enclosure.

2. A housing for an ultraviolet lamp, as claimed in claim 1, in which said lamp enclosure cooling means includes a coolant duct extending longitudinally of said lamp enclosure at said opposite side oF said lamp enclosure;

and coolant inlet and outlet means at respective opposite ends of said coolant duct for flow of a gaseous coolant through said coolant duct.

3. A housing for an ultraviolet lamp, as claimed in claim 2, in which said lamp enclosure cooling means further includes a heat sink extending longitudinally of said coolant duct and in heat transfer relation with said lamp and said reflector sections.

4. A housing for an ultraviolet lamp, as claimed in claim 3, in which said heat sink comprises a substantially flat plate having a substantially planar inner surface facing said lamp and said reflector sections, and a series of ribs extending longitudinally of the outer surface of said plate.

5. A housing for an ultraviolet lamp, as claimed in claim 4, in which said coolant duct has an outer wall extending substantially parallel to said opposite side of said lamp enclosure;

said heat sink being movable between a first position in which it is disposed in said coolant duct intermediate the outer wall of said coolant duct and said opposite side of said lamp enclosure, and a second position in which it is at the said opposite side of said lamp enclosure and forms an inner closure wall for said coolant duct, extending parallel to said outer wall; and

means connecting said heat sink between its first and second positions and vice versa.

6. A housing for an ultraviolet lamp, as claimed in claim 5, including a drive shaft secured to and rotatably supporting one of said reflector sections;

an idler shaft secured to and rotatably supporting the other of said reflector sections;

said driving means being operatively connected to said drive shaft;

respective gears on said drive and idler shaft intermeshing with each other whereby said reflector sections are conjointly moved between their first closed reflector position and their second closed shutter position, and vice versa; and

respective links each having one end articulated eccentrically to a respective one of said gears and the opposite end articulated to said heat sink for moving said heat sink to the first heat sink position responsive to movement of said reflector sections to the first closed reflector position and for moving said heat sink to the second heat sink position responsive to movement of said reflector sections to said second closed shutter position;

said links constituting the means connecting said heat sink to said driving means.

7. A housing for an ultraviolet lamp, as claimed in claim 4, in which said coolant duct has an outer wall extending longitudinally parallel to said opposite side of said lamp enclosure;

said heat sink being fixedly positioned substantially at said opposite side of said lamp enclosure and constituting an inner wall of said coolant duct; and

liquid coolant ducts extending longitudinally of said outer surface of said flat plate for flow of liquid coolant therethrough to absorb, from said heat sink, heat transferred to said heat sink from said reflector sections and said lamp.

8. A housing for an ultraviolet lamp, as claimed in claim 2, including side and end walls defining a relatively elongated second lamp enclosure having an elongated opening at one side thereof;

said second lamp enclosure being arranged in facing relation with said first-mentioned lamp enclosure with said elongated openings congruent with each other; and

a second coolant duct extending longitudinally of the opposite side of said second lamp enclosure and having coolant inlet means at one end thereof and coolant outlet means at the other end thereof for cirulation of a gaseous coolant therethrough.

9. A housing for an ultraviolet lamp, as claimed in claim 8, including a respective pair of light shields secured to each lamp enclosure, each extending along a respective side wall of the associated lamp enclosure;

each light shield being completely closed except for an open and coplanar with the elongated opening at one side of the associated lamp enclosure;

corresponding light shields of the two lamP enclosures abutting each other in congruent relation;

each light shield having an outer end wall extending substantially parallel to the side wall of the associated lamp enclosure and formed with a rectangular notch therein;

said notches of correspondingly located light shields conjointly defining entry and exit slots for passage of a printed web through said lamp housing.

10. A housing for an ultraviolet lamp, as claimed in claim 8, including a second elongated ultraviolet lamp mounted in the end walls of said second lamp enclosure;

a pair of second elliptical reflector sections mounted in said second enclosure for rotation about respective axes extending in spaced parallel relation to said second lamp; and

second driving means operable to rotate said second reflector sections between a first closed reflector position in which they form an elliptical reflector having a first focus at said second lamp and a second focus at the plane of said elongated opening in said second lamp enclosure and a second closed shutter possition in which they are interposed between said second lamp and said last-named opening, and vice versa.

11. A housing for an ultraviolet lamp, as claimed in claim 1, including pairs of auxiliary light shields disengageably and interchangeably mounted in said lamp enclosure in substantially the plane of said elongated opening at one side thereof, and reducing the lateral width of said elongated opening to correspond to the lateral width of a relatively narrow printed web moved across said elongated opening when said housing is in said operative position.

12. A housing for an ultraviolet lamp, as claimed in claim 11, in which each auxiliary light shield comprises a flat plate bent back on itself to form a bight and a pair of legs extending from said bight;

the bights of each pair of auxiliary light shields defining the path of movement of a printed web;

the legs of each auxiliary shield being frictionally embraceable with a respective inwardly extending flange at said elongated opening at one side of said lamp enclosure.

13. In combination, at least two housing for an ultraviolet lamp, as claimed in claim 1, arranged in juxtaposed relation;

each housing having a respective pair of shafts secured to and rotatably supporting the reflector sections therein;

respective gear means in each housing interconnecting the shafts of the respective pair therein for conjoint rotation in opposite directions;

respective sprockets each secured to one shaft in each housing;

said driving means being included in only one of said housings; and

chains interconnecting the sprockets of all said housings, whereby all of said reflector sections are conjointly rotated between their two said positions by the single driving means in said one housing.

14. The combination as claimed in claim 13, in which each lamp cooling means includes a respective coolant duct extending longitudinally of the associated lamp enclosure and having a coolant inlet at one end and a coolant outlet at the opposite end for flow of coolant therethrough;

and a respective heat sink in each lamp housing operatively associated with the respective coolant duct, the respective lamp and the respective reflector sections thereof.

15. A housing for an ultraviolet lamp, for use in drying printed webs of a web printing press, as recited in claim 1, wherein said opening extends transversely across the path of movement of said printed web.