US2418754A - Method for registering negatives - Google Patents

Description

April 8, 1947. L BRUNET 2,418,754'

METHOD F OR REGISTERINGFNEGATIVES Filed April 13, 1944 @www Patented Apr. 8, 1947 UNITED STATES PATENT orrlcl:

METHOD FOR REGISTERING NEGATIVES Laurent Brunet, Montreal, Quebec, Canada Application April 13, 1944, Serial No. 530,781

1 Claim.

VThe present invention pertains to the registering of a plurality of negatives for simultaneous printing to form a multi-exposure. The invention is applicable to various graphic arts as stated more speciiically hereinafter.

The principal object of the invention is to provide a method of accurately registering the negatives in a simple and rapid manner. rlhe advantages resulting from such a method are generally a saving of time and material and are enumerated in some detail below.

The device by which the invention is practiced is a frame having a latticed transfer cover. A transparent plate is located therein and the negatives are registered on the plate in the usual manner. The cover is then brought down and permits of the upper negative being attached thereto because of its lattice formation. The cover is now raised, the plate and remaining negative removed, and a fresh plate inserted and located in the place of the rst one, and the negative thereon is transferred to the fresh plate. Both plates are iinally set in the printing frame and located therein as they were in the transfer frame, so that the original registration of the negatives is retained.

The invention is fully disclosed by way of example in the following description and in the accompanying drawings in which:

Figure 1 is a perspective View of the device in open position;

Figure 2 is a perspective view of the device in closed position;

Figure 3 is a view similar to Figure 1, with the glass removed;

Figure 4 is a cross section; and

Figure 5 is a perspective view of the exposing assembly.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

As' shown in Figures 1, 2 and 3 the device comprises a bottom frame I and a cover 2 hinged thereto at 3. On the bottom frame are three stops 4 forming a right angle for locating a glass plate 5. For holding the glass plate in position a number of detents 6 is pivotally attached to the margins of the frame I and drawn against the glass by springs 1.

To produce a multi-exposure, a negative 8 is iirst laid on the plate 5, and over this is laid another negative 9. Both negatives are fastened to the glass by gummed strips, those for the second negative being designated by the numeral II) and those for the first negative by numeral 2 itl. Each negative carries a portion of the picture to be produced, The negatives are brought into proper register with one another by means of suitable index marks, usually in the form of cross lines in the corners as Well known in the art.

The transfer cover 2 is then brought down on the bottom frame I as shown in Figure 2. The transfer cover carries a pair of lengthwise strips ii and connecting transverse strips I2. The strips consist of tin, Celluloid or other suitable material. Next, the gummed strips holding the upper negative 9 are removed, and this negative is taped by gummed strips 20 to the other side of strips II and l2 without changing its position. The glass plate 5 with the negative 8 thereon is now removed and another plate is inserted ln the same position. Finally the cover 2 is brought down on the second plate and the negative 9 is taped thereon and detached from the cover, without changing its position. The two glass plates now carry the two negatives in perfect registration, requiring only that the plates be registered with each other in the printing frame. If three or more negatives are required for the composite print, the operation is continued.

The printing frame I5 is made of sheet metal or pressed wood and has a rubber surface I6 to insure perfect contact when placed in the usual vacuum frame. The lm I'I is mounted on the rubber surface and is held by gummed strips I8. The frame I5 carries a set of stops I9 forming a right angle, .las in Figure 1. The previously described glass plates carrying the negatives 8 and 9 are now mounted upon the film and brought into contact with the stops I 9, whereby the negatives are registered with one another. Sliding wedge blocks 2o' on the frame I5 engage the free edges of the glass plates and hold the plates from Slipping away from the stops I9 in manipulation during exposure for printing.

The accurate registration of the several negatives by means of the invention results in several economies. There is practically no waste of lm resulting from improperly registered negatives. Similarly there is a saving of time, especially in stripping and opaquing. Due to the simplicity of the device, skilled labor is not required in operating it. Time is also saved in matching and stripping. The originals are subjected to less handling, and an economy in camera operation is realized.

The device accomplishes a perfect fit for color work and is useful in lithography, photo-engraving and similar graphic arts.

Although a speciiic embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claim.

What I claim as my invention is:

The method of mounting negatives in a registering relation on transparent plates, consisting in locating a plate in a frame, taping separately negatives one over the other on said plate in registered relation, laying a transfer cover on said frame, said cover having a lattice structure, transferring the upper negative to said cover by taping it to the edges of openings formed in said cover and untaping it from said plate, lifting the cover and removing said plate, locating another plate in said frame, again laying the cover upon said frame in its former position, and taping said upper negative to said second plate and then untaping it from said openings, the second plate being removed and placed with rst plate on a. printing frame ready for printing in registering relation.

LAURENT BRUNET.

REFERENCES CITED The following references are of record in the le of this patent:

Images