US1635618A

US1635618A - Mask for printing machines

Info

Publication number: US1635618A
Application number: US711495A
Authority: US
Inventors: Hammond Frederick
Original assignee: H F COHEN
Current assignee: H F COHEN
Priority date: 1924-05-06
Filing date: 1924-05-06
Publication date: 1927-07-12
Anticipated expiration: 1944-07-12

Description

July 12,1927. 1,635,618

v F. HAMMOND MASK FOR PRINTING MACHINES Filed May 6. 1924 gwuawtoz dv W Patented July 12,1927.

2 uni-ran srarss FREDERICK HAMMOND, OF HOUSTON, TEXAS, ASSIGNOB TO H. F. COHEN.

MASK FOR PRINTING MACHINES.

Application fl'led May 6, 1924. Serial No. 711,495.

This invention relates to newand useful in'iprovcments in a mask for printing machines.

()ne object of the invention is to provide a printing machinemaskof such construction that it will hold the sensitized paper in proper relation to the film, so as to give a correct and uniform n'nirgin to the printed picture thus obviating the necessity of trimming the completed picture.

Another object of the invention is to provide a printing machine mask of such con struction that the films maybe passed through the machine in a strip, and the pictures successively and quickly printed, thus making it unnecessary to cut the strip into individual films for printing purposes.

A further feature of the invention resides in the provision of a very simple type of mask-for printing machines by the use of which the printing process may be easily and quickly accomplished.

With the above and other objects in view, this invention has particular'relation to certain novel. features of construction, operation and arrangement of parts, an example of which is given in this specification, and illustrated in the accompanying drawings, wherein Figure 1 is a vertical sectionalview of a printing machine, with the mask applied thereto.

Figure 2 shows, a horizontal sectional view of the machine showing a plan view of the mask thereon.

- Figure 3 shows a plan view of the mask; and, Q

F i gure 4 shows an edge view thereof.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 designates the casing of the printing machine whose upper side declines forwardly and is provided with the transparent printing table 2. The numeral3 designates the platen which is suitably mounted by means of the hand operated lever, or handle 4, and the toggle/links .5, 5, so that it may be firmly pressed against the paper in printing, and raised therefrom when the printing process has been completed. In the casing 1 there is a lamp 6, wired in circuit with a. suitable battery, or other source of electrical energy, and the electrical circuit is equip ed with an automatic switch 7 through w rich the circuit is completed, the instant the platen presses against the paper and broken simultaneously with the raising of the platen. This obviates all possibility of exposing the paper before or after it is in absolute contact with the negative. The parts of the printing machine hereinbefore described are of conventional construction and are adverted to for the purpose of a clearer understanding of the advantages and method of use of the improved type of mask presently to be described.

This mask is in the form of a rectangular plate 8, preferably of copper, and having the marginal perforations 9, 9, near one edge, to receive the

hooks

10, 10, above the table v2, to hold the mask superimposed in proper relation above the table.

The mask also has an opening 11 therethrough, usually rectangular in form, through which the paper is exposed to the light. This opening is of the required size to accommodate the negative, masks with openings of different sizes being used for different sizes of negatives or pictures. Spaced from one side and from one end of the opening are the rib-like abutments 12 and 13, against which the corresponding margins of the print paper 14 abuts, and

these abutments hold the paper in proper position over the opening 11, so that the picture, when printed, Wlll be centered on the paper, with a uniform margin, thus dispensing with the necessity of trimming the completed picture.

The strip of films 15 is passed over the table 2, and underneath the mask without obstruction, so that negatives of a continuous strip may be printed successively without the necessity of cutting the strip into individual negatives.

What I claim is:

The combination with a printing machine having a printing table formed with a transparent portion, said machine also being provided with hooks, of a mask adapted to rest on said table and having an opening adapted to align with said transparent portion, upstanding abutments on the upper surface of the mask, said abutments being arranged in substantially right angular relation to each other and spaced from one side and one end respectively of said opening, said mask having perforations through which said hooks are adapted to engage to hold the mask in proper alignment with said transparent por- 10 tion.

In testimony whereof I have signed my name to this specification.

FREDERICK HAMMOND.