US2895378A - Photographic enlarger - Google Patents

Description

7 July 21, 1959 w. J. BUDDE PHOTOGRAPHIC ENLARGER Filed Feb. 20, 1957 2 Sheets-Sheet 1 William :IBzzdde INVENTOR ATTORNEYS 9 5 9 1 1n 2 I u J W. J. BUDDE PHOTOGRAPHIC ENLARGER an aw e z B J m w INVENTOR ATTORNEYS PHOTOGRAPHIC ENLARGER William J. Budde, New Orleans, La. Application February 20, 1957, Serial No. 641,387

1 Claim. (CI. 88-24) This invention relates to a new type of high speed automatic vibration-proof photographic enlarger. Present day photographic enlargers operating at their maximum speed can expose about 300 pictures per hour. This high speed enlarging machine is capable of exposing more than a thousand pictures per minute. Present day photographic enlargers must be operated in a room that is dark and free of all vibration. This enlarging machine can be installed in a light tight cabinet and operated anywhere that man can go regardless of light or vibrations such as buses, trailers, trucks, trains, ships, submarines, airplanes, space ships, etc.

Large rolls of light tight photographic printing paper are fed into the machine much the same as in a roll film camera. For the artistic photographer who must spend many hours exposing one picture, this machine can be operated like any conventional enlarger by using the pilot light manually to expose the picture.

An object of this invention is to provide a high speed enlarger whereby prints may be made from a negative by use of a machine in which vibration is entirely eliminated.

Another object of this invention is to provide a photographic enlarger which will print at relatively high speeds with color and sharp outlines.

A further object of this invention is to provide a vibration-free photographic printing machine embodying the use of a pilot light whereby the negative may be focused on the printing paper and subsequently a flash may be produced whereby the light will be projected through negative and onto the printing papers.

A further object of this invention is to provide a n1achine of this type which is of simple construction so that the machine will not readily get out of order.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings:

Figure 1 is a detail front elevation partly in vertical section of a photographic printing machine constructed according to an embodiment of this invention.

Fig. 2 is a vertical section taken longitudinally through the base of the machine.

Fig. 3 is a diagrammatic view showing the electric circuits embodied in this invention.

Referring to the drawings the numeral 10 designates generally a base structure which is formed of a horizontal platform or table 11 having depending legs or walls 12 and 13 extending downwardly from each end thereof. The base 10 also includes printing paper housing members 14 and 15 disposed at each end of the base 10. A motor 16 is disposed below the table or platform 11 on the nited States Patent M 2,895,378 Patented July 21, 1959 inner side of the wall 13 and a pair of outwardly projecting roll supporting arms or brackets 17 extend outwardly from the wall 13 and the arms 17 are each provided with an outwardly and upwardly inclined notch 18 within which the shaft 19 is adapted to rotatably engage. A grooved pulley 20 is mounted on one end of the shaft 19 and a belt 21 engages about the pulley 20 and also about a driving pulley 22 which is mounted on the motor shaft 23. The shaft 19 has a roll 24 secured thereto and about which the printing paper 25 is adapted to be wound. The housing 15 includes a hinged cap 26 which is hinged as at 27 so that the cap 26 may be raised upwardly and outwardly to permit removal of the wound paper on the roll 24. The cap 26 includes an inwardly projecting flange 28 which is formed on the inner wall 29 of the cap and the flange 28 is rounded as at 30 so as to present a smooth non-scratching surface to the upper sensitive side of the paper 25.

A lower idler roller 31 is mounted on a shaft 32 journaled in the lower portion of the housing 15 and an upper roller 33 is carried by the shaft 34 journaled in bearings 35 carried by the lower portion of the housing 15. At the opposite or left end of the base 10 the housing 14 has a pair of upwardly projecting bracket arms 36 having upwardly and outwardly inclined notches 37 in which a shaft shown at 38 is adapted to rotatably engage. The shaft 38 lras fixed thereon an inner roll 39 about which a paper roll 25 constituting the printing sup ply paper is adapted to be wound. The paper 25 is extended forwardly or to the right between a air of idler rollers 41 and 42 similar to rollers 31 and 33 and the paper then engages beneath a lower flange 43 carried by the inner wall 44 of a hinge cap 45. The cap 45 is hinged as at 46 to the housing 14. Roller 41 is carried by a shaft 77 journaled in arms 36, and the roller 42 is carried by a shaft 78 journaled in bearings 79.

The base 10 has mounted therein adjacent the motor 16 a flash tube color supply member generally indicated at 47. A vertically disposed standard or supporting base 48 rises from one side of the base 10 and has mounted thereon a combined negative holder and light source generally indicated at 49. A tubular housing 50 is provided which is secured to the base 48 and is vertically adjustable in a conventional manner (not shown). The housing 50 has extending downwardly therefrom a bellows 51 and the bellows 51 at the lower end thereof, has secured thereto a lens 52. A negative holder 53 is disposed at the upper end of the bellows 51 and is adapted to hold a negative which is projected through the lens 52 onto the sensitive upper side of the printing paper 25 which is positioned on the upper side of the table 11. The housing 50 has mounted therein a pair of oppositely disposed globular light-diffusing members 54 and 55. A partly globular reflector 56 extends upwardly from the housing 50 and a pair of light bulbs are disposed in a socket 57 carried by the upper portion of the reflector 56. The light bulbs which are disposed in the socket 57 comprise a pilot light 58 and a flasher tube 59. The two lights 58 and 59 may be formed as an integral or double unit so that the two lights may be mounted in a single socket. The light 58 which is the pilot light is connected by means of conductors 60 and 61 to a pair of conductors 62 and 63, respectively, and a manually operated switch 64 is interposed in conductor 60.

The motor 16 is connected by means of conductors 65 and 66 to conductors 60 and 61 respectively, and a manually operable switch 67 is interposed in conductor 65. The conductors 62 and 63 are connected to the power unit 47 which provides the high voltage force required with flashing the light bulb 59. A flasher switch generally indicated at 68, is operated by rotation of shaft 34. A cam wheel 69 is mounted on one end of shaft 34 and the cam wheel 69 includes a cam lobe 70 which is adapted to engage a normally open switch blade 71. The blade 71 is adapted to engage a contact 72 and contact 72 is connected by means of a conductor 73 to one side of the power source 47. The switch blade 71 is connected by means of a conductor 74 to one side of the light bulb 59 and the other side of light bulb 59 is connected by means of a conductor 75 to the power source 57.

in the use and operation of this machine the negative which is to be printed is placed in the holder 53 and the projection of the negative through the lens 52 is focused by closing switch 64 to energize pilot light 58. When the negative has been properly focused switch 64 is opened to turn off pilot light 58 then switch 67 to the motor 16 is closed so that the printing paper Will be moved from left to right across the table or platform 11. As the paper 25 moves over the table 11 each frame or complete picture will be flashed by engagement of cam lobe 70 with normally open switch 68. When this switch is closed flasher bulb 59 is energized for a fraction of a second so as to thereby expose the image of the negative upon the sensitized side of the printing paper 25. The paper 25 will be wound on roll 24 so long as motor 16 is operating and the flasher bulb 59 will intermittently flash light through the diffusing members 54 and 55 so as to expose the image on the sensitized side of the printing paper 25.

What is claimed is:

A photographic enlarger comprising a base, oppositely extending roll supporting bracket arms carried by said base, a supply roll rotatably disposed on one pair of arms, a winding roll rotatably carried by the other pair of arms, an electric motor, a belt and pulley connection between said motor and said winding roll for rotating the latter, a centrally disposed platform on said base, sensitized paper in said supply roll extending across said platform to said winding roll, a housing for each roll having a slotted opening therein adjacent the top of said platform, said sensitized paper extending through said opening, a pair of upper and lower idler rollers in each housing adjacent its slotted opening, said upper roller of each pair of rollers being disposed above the upper side of said sensitized paper in contact with and rotating said upper rollers by contact with the sensitized paper, a shaft mounting each idler roller, a vertically disposed standard centrally disposed on said base, a housing carried by said standard, a negative holder in said housing above said platform, an electronic flasher tube in said housing above said negative holder, a power source providing current for said flasher tube, a normally open flasher switch including a switch blade in said housing for said winding roll, and a cam on said upper roller of one pair of rollers operable intermittently moving said switch blade to close said flasher switch, said cam being mounted on the shaft of the adjacent idler roller whereby rotation is imparted thereto upon rotation of its associated idler roller by the passage of said sensitized paper thereunder.

References Cited in the file of this patent UNITED STATES PATENTS 2,227,987 Tuttle Jan. 7, 1941 2,251,998 Goodale Aug. 12, 1941 2,530,396 McGuffin Nov. 21, 1950 2,557,182 Forgett June 19, 1951 2,803,991 Wagner Aug. 27, 1957

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