US2900889A

US2900889A - Photographic printing apparatus

Info

Publication number: US2900889A
Application number: US409881A
Authority: US
Inventors: Emanuel M Jaffe; Edmund S Galaw
Original assignee: DUOPHOTO CORP
Current assignee: DUOPHOTO CORP
Priority date: 1954-02-12
Filing date: 1954-02-12
Publication date: 1959-08-25
Anticipated expiration: 1976-08-25

Description

1959 E. M. JAFFE ETAL 2,900,889

PHOTOGRAPHIC PRINTING APPARATUS 3 Sheets-Sheet 1 Filed Feb. 12. 1954 A n A .EVNI

INVENTORS EMANUEL M. JAFFE EDMUND S. GALAW BY m, (M/17.6., aw; M

ATTORNEYS Aug. 25, 1959 E. M. JAFFE ETAL PHOTOGRAPHIC PRINTING APPARATUS 3 Sheets-Sheet 2 Filed Feb. 12. 1954 w... W a, A T mus m L W EE 2% p 6. 3 m F Aug. 25, 1959 E. M. JAFFE ET AL 2,900,889

PHOTOGRAPHIC PRINTING APPARATUS Filed Feb. 12. 1954 I5 Sheets-Sheet 3 INVENTORS EMANUEL M. JAFFE EDMUND S. GAL AW KM, m, M 'zr aw ATTOBNEYS 2,900,889 7 rneroemmc PRINTINGAPPARATUS Emanuel M. Jalfe, Brooklyn, and Edmund S. Galaw,

Bellerose, N.Y., assignors to Duophoto Corporation, New York, N.Y., a corporation of New York A' 'iiiii'c'aiidii February 12, 1954, Serial No. 409,881

2 Claims. c1. 95-775 This invention relates to photographic printing apparatus designed primarily for use in making photographic copies on light-sensitive paper of letters and other typewritten or printed matter on paper or other translucent sheets. f

,The principal objectof the invention is to provide an apparatus of this character which is of simple, rugged design and which is adapted to be continuously operated at comparativelyhigh speeds so asto effect the -printing nperaition as rapidly as an operator can place the sheet bearing the matter to be copied and the light-sensitive sheet together "and feed theminto the machine.

A further object o-f the invention is to provide an apparatus wherein the light-sensitive sheet and the sheet to be printed, although fed rapidly through the machine, are firmly held together in relatively immovable relationship wi-th the entirearea of the sheet to be printed fully and uniformly exposed to the light.

I A further object of the invention is to provide an proved light sourcefor a machine of this character wherein a cold cathode lighting unit is employed in such manher that the exposure time may be adjusted over a wide range. 7,

Other objects of the invention will appear from the following specification and the accompanying drawings wherein we have illustrated apreferred form of our invention, and also a modified lighting arrangement for obtaining a w de range of a i y- In the said drawings:

Fig. l is a plan view of the machine with the cover removed;

. Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1; Fig. 3 is a perspective view showing the light unit; Fig. 4 is the wiring diagram of the unit shown in Fig. 3; Fig. 5 is an end view of a modified light unit;

Fig. 6 is a side view partially in section of the view shown in Fig. 5; and

Fig. 7 is a wiring diagram for the modified unit.

Referring to the drawings, particularly to Figs. 1 and 2, 1 indicates the base of the machine which is preferably formed of a flanged sheet metal stamping of the shape shown. Mounted on the base and attached thereto by welding or other suitable means is a side wall structure shaped to provide a rear wall 2 and two end walls 3 and 4, the front being open for the reception and delivery of the sheets to be copied and the light-sensitive paper.

The machine proper consists of a hollow glass cylinder surrounding the printing light and against the outer surface of which the sheets are held during the printing operation under a series of rubber bands which not only hold the sheets in place but serve to continuously rotate the glass cylinder. The structure as shown comprises four

rollers

5, 6, 7 and 8, see Fig. 2, mounted for rotation in two sheet metal partition members 9 and 10 which are, as shown, welded or otherwise attached to the inturned edges of the end walls 3 and 4 of the machine. The rollers 6 and 7 at the rear of the machine Aug. 25, 1959 are supported on

stationary rods

12 and 13 which extend from one partition plate to the other and are fixedly clamped at each end to the partition plates. The roller 8 is attached to a shaft 14 which extends through bearing 15 carried by the partition plate 9 and connected by the coupling 16 on the driven shaft of a reduction gear 17 carried by the driving motor 18.

The front top roller 5 extends between theside members 9 and 10 and is provided, at its ends with reduced spindles which in are held in position in inclined slots 19 in the upper walls of the partition plates 9 and 10.

surroundingall four of the

rollers

5, 6, 7 and 8 are a series of wide rubber bands 21 which extend the full width between. the side plates, the bands being spaced one from another sufficiently to allow each band to operate independently of the other. The bands are of a length such. that they will be elongated about 10% of their normal length when under the tension placedupon them when the machine is assembled for operation. when so assembled the serve to feed the sheets through the machine and hold them printing contact with a glass cylinder which is supported solely by the bands and the rollers Sand 8 in the manner shown in Fig. 2f. The glass cylinder 22 consists merely of a cylindrical sheet of glass of uniform thickness as shown. It is held in place and rented by the rubber bands which pass aronnd it in the manner shown and hold it in contact with the from rollers s and 8, Within the glass cylinder 22 is mounted cold cathode exposure light. The light comprises -a supporting rod 25 which extends axially {er the glass cylinder when the latte'r is held in position by the rubber bands 'the shaft in being carried by two supplementary end plates 26 and. 27 mounted on the end of the'snpporting rods of the rollers s and 7 The light itself comprises s ectjor shap'ed supporting members 28 attached "to the rod 25 near the ends lof'ithe glass cylinder 22 Ianda continuous luminesc eht tube 3 1 which is looped hackand forth from block to block in the niahnenshown, ,theparallel lengtl'is of tubing being so arranged as to ifectfa se'c't'or ofa cylindrical v'il'all "concen'nic with wall of the glass "cylinder 22 and closely adjacent thereto;

For guiding papers into and out of the machine, sheet metal guides 30 and 31, shown in Fig. 2, are provided, these being supported in any'suitable manner by the partition plates 9 and 10.

In using the apparatus the sheet to be copied and the sheet of light-sensitive paper of appropriate size are placed'together on the upper sheet supporting guide 31 and thrust 'into contact with the rotating glass cylinder just below the upper roller 5. The rotation of the glass cylinder carries the sheet downwardly into the grip of the rubber hands against the face of the glass cylinder, and the two sheets thus held firmly in contact with each other and in immovable relation by the rubber bands are carried around with the glass cylinder and discharged onto the delivery guide 31.

The operator can readily grasp the sheets as thus delivered by the machine and lay them aside until the copying is done. A single operator can place the sheet to be copied and a light-sensitive sheet together in proper relation during the interval that the previous sheets are passing through the machine so that as soon as one printing operation is accomplished another pair of sheets can be fed directly to the machine.

Also, of course, the sheets to be printed and the sheets of light-sensitive paper can be paired together in advance of the printing operation and the paired sheets fed through the machine with the leading edge of one pair of sheets following closely the trailing edge of the preceding pair. The motor runs continuously and its speed can be ad 3 justed through the variable resistance, as may be required to suit the skill of the operator and the nature of the work. The time of printing may be varied by adjusting the position of the supporting shaft in accordance with the transparency of the paper for the luminescent light. In the position shown two-thirds of the parallel lengths of the luminescent tube are positioned to directly illuminate the sheet held between the glass cylinder and the rubber band, but by turning the lamp about its axis in the counterclockwise direction as shown in Fig. 2, additional lengths of the lamp tube may be brought into position for the light to fall directly on the glass cylinder at the point where the document is held by the rubber bands. To remove the glass cylinder and with it the light it is only necessary to release the bolts 33 which clamp the supporting rod 25 to the

auxiliary end plates

26, 27, and lift the front upper roller out of the inclined slots in which it is supported, thereby permitting the glass cylinder and the lamp to be lifted out of the machine. To permit the removal of the cylinder and the lamp the partition members 9 and are slotted as indicated in Fig. 2.

In Figs. 5, 6 and 7 we have illustrated a modified form of light unit wherein the luminescent tube extends throughout the entire 360 degrees of the circumference of the transparent cylinder. The luminescent tube is preferably divided in two

sections

42 and 43 each of which occupies half the circumference of the glass cylinder. The tubes which extend back and forth from one end of the cylinder to the other are supported at their ends by disks 41 which are in turn carried by a hollow shaft 40 which is fixedly supported in the

end plates

26, 27, in the same manner as the shaft 25 of the previously described lighting unit. Two lamp sections are held in place by metal strips 44 which clamp the end portions of the tubes to the underlying end supports 41.

The wiring diagram for the two-section light is shown in Fig. 7. Each section is connected to its own transformer and switch to the power line. In one section the primary winding of the transformer is directly connected to the lighting tube while in the other section the pri mary of the transformer is connected through a suitable rheostat. By this arrangement the quantity of light can be regulated from a very small minimum, when the light 42 is cut ed by its switch and the rheostat in the circuit of light 43 is at its minimum current adjustment, to a maximum equal to the full capacity of both lamps.

While we have shown and described the preferred form of our invention as now made by us, it is to be understood that our invention is not limited thereto, but may be variously modified within the scope of the appended claims.

We claim:

1. In a photographic printing machine a frame comprising end plates, means for fixedly supporting said plates in spaced relation with their opposite faces substantially parallel, an open ended glass cylinder of a length slightly less than the space between said plates, means for supporting said cylinder between said plates comprising a plurality of parallel rollers having their ends mounted for rotation in said plates at spaced points around said cylinder, two of said rollers on one side of said cylinder being separated by a distance less than the diameter of said cylinder, a series of endless belts of extensible material trained around said rollers, said belts being of such length that one reach of said belts extends around said cylinder and holds said cylinder against said two rollers and a lamp within said glass cylinder for photo-printing. light sensitive surfaces carried around with said cylinder by the movement of said belt about said rollers one of said two last mentioned rollers being mounted in slots extending radially outward from the cylinder.

2. The printing apparatus of claim 1 wherein the mountings and connections of said lamp are separable at points within and adjacent said plates whereby the lamp and cylinder may be removed when said last mentioned roller is removed from its bearings.

References Cited in the file of this patent UNITED STATES PATENTS 2,297,573 MacDonald Sept. 29, 1942 2,320,334 Bates June 1, 1943 2,402,929 Sutherland June 25, 1946 2,459,362 Cary Jan. 18, 1949 2,467,241 Streich Apr. 12, 1949 2,548,936 Blick Apr. 17, 1951 2,559,159 Hruby July 3, 1951 FOREIGN PATENTS 608,984 Great Britain Sept. 23, 1948