US1669821A

US1669821A - Process of making printing plates

Info

Publication number: US1669821A
Application number: US473782A
Authority: US
Inventors: Grass Alfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-05-31
Filing date: 1921-05-31
Publication date: 1928-05-15
Anticipated expiration: 1945-05-15

Description

May 15, 1928. r 1,669,821

7 A. GRASS PROCESS OF MAKING PRINTING PLATES Original Filed May 31. 1.921

Fly. 1.

11 m1: TTORNEY Pumas May 15, 1928.

PATENT OFFICE- AIIFBED GRA SS, 'OF NEW 1033, N. Y.

PROCESS OF MAKING PRINTING PLATES.

Application illed lay 81, 1921, Serial No. 473,782. Renewed larch 18,1926.

This invention relates to the preparation of relief, intaglio or embossed letters or characters, for photographic reproduction incident to the preparation of a zinc printing 5. plate or the like.

Prior to my invention it has been generally the custom to prepare the set-up matter for photo aphing in the. reparatlon of a zinc plate y bringing the aces-of the type or characters into a nearly perfect plane; This process has beenlmown in the industry as make-ready and has been extremely costly and tedious. It has required an un-' usually high degree of skill. The characters 10 which, of course, may consist of letters, figures, geometrical designs, or the like, are first assembled in the desired relation and 1 thin strips of paper, metal, or other suitable material are placed under such of the type or units as are too short to accurately reach the desired plane. When the operator believes the type are accurately positioned in the surface plane a proof is taken. This ro'bf discloses any unevenness that may ex- 1st, and an effort is then made to read'ust such typeas may still be short of the pr nting plane. In practice thisprocedure is fre rgiently repeated again and again, and until t e proof sheet is satisfactory. The finally accepted proof is then photographed.

A principal'object of the invention is to.

' obviate the necessity for any make-ready and its attendant expense, and at the same time to obtain a plate sharper, clearer, and of :5 more exact d than is' possible with the earlier descri method.

Another important object of the invention is the provision of a simple recess for ac lishing this result whic will not recomp lo uiretbehi 'degreeofskillneededintheq 8h whichwillnotrequire up matter before being rendered ready for photographing; and

Fig. 2 is a similar view of the same after tregtment in accordance with my invention, an

Fig. 3 is a section on the line 3--3 of Fig.

My invention contemplates the elimination of the necessity for taking a proof and the photographing in the first instance of the type set-up. Inaccordanc'e with my improved process the type is first set up in proper arrangement and allbut the type or character faces are then rendered non-actinic so that when the (photographic exposure is made the sensitize surface receives impression only from the typefaces or exposed actinic surfaces.

This may conveniently be done by painting the entire surface of the set-up with a brush, or otherwise, and with some nonactinic substance, such as black paint, and then removing this substance, by wiping or otherwise, from the relief surfaces. Referring to the. drawing, Fig. 1 shows a' type set-up, or rather a part of a type set-'up.

The built-up design consists of an assemblage of unit blockslO and 11 positioned in proper relation to 'each other to form the desired design. Certain of these blocksare provided with relief or raised portions 12, the faces of which provide the printin surfaces. Fig. 2 illustrates the set-up -a er it has been treated by paintin or otherwise to .render'non-atitinic all 0 the ex sed faces except the printing surfaces 0 the type or other characters.

It is believed that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages,

the form hereinbefore described being merelya' referred embodiment thereof.

I c aim f 1. The process of preparing matter for photograp ic reproduction incident to the preparation of a photographic plate, which comprises arranging the type or other characters having portionsprojectmg above surrounding or intervening spaces and in substantially the same plane, covering all exposed faces with a non-actinic substance, and then removing said substance from the surfaces of the projecting portions.

2. The process of preparing matter for photograp ic reproduction incident to the preparatlon of a zinc plate, which comprises arranging the type or other characters having portions projecting above surrounding or intervening spaces and in substantially the same plane, covering all exposed faces with a non-actinic substance, and then wiping said substance from the surfaces of the projecting portions.

3. The rocess of preparing matter for photograp ic reproduction incident to the preparation of a photographic plate, which comprises setting up the type, and rovlding a non-actinic coating upon all ut the portions or faces of the type which it is de sired to photograph.

4. The rocess of preparing matter for photographic reproduction incident to the preparation of a zinc plate, which comprises arranging the characters having portions projecting above surrounding or intervening spaces and rendering all but the outer faces of said characters non-actinic.

5. The process of photographic reproduction incident to the preparation of a zinc plate which comprises setting up the type, rendering all but the printing surfaces of said type non-actinic and photographing.

ALFRED GRASS.