US1812199A

US1812199A - Press for obtaining photographic prints by means of electric light

Info

Publication number: US1812199A
Application number: US313819A
Authority: US
Inventors: Crayssac Leon
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-10-27
Filing date: 1928-10-20
Publication date: 1931-06-30
Anticipated expiration: 1948-06-30

Description

June 30, 1931.

L. CRAYSSAC PRESS FOR OBTAINING PHOTOGRAPHIC PRINTS BY MEANS OF ELEGTRIC LIGHT Filed Oct. 20, 1928 5 Sheets-Sheet l L. CRAYSSAC June 30, 1931.

PRESS FOR OBTAINING PHOTOGRAPHIC PRINTS BY MEANS OF ELECTRIC LIGHT Filed Oct. 20, 1928 3 Sheets-Sheet 2 June so, 1931. L. CRAYSSAC 1,812,199

PRESS FOR OBTAINING RHOTOGRAPHIC PRINTS BY MEANS OF ELECTRIC LIGHT Filed Oct. 20, 1928 3 Sheets-Sheet 3 I//// I 22' 6 MW 26 42 JMW WL Patented June 30, 1931 UNITED STATES PATENT; OFFICE LEON GRAYSSAC,- OF SETE, FRANCE PRESS FOR OBTAINING PHOTOGBAPHIC PRINTS BY MEANS OF ELECTRIC LIGHT,

Application filed October 20, 1928, Serial No. 313,819, and in France October- 27, 1927.

The present invention relates to an apparatus for obtaining photographic prints, the purpose being to make a handy light tight apparatus of reduced proportions with the possibility of usin the ordinary electric light current, with t e secondary purpose to be useful in develo ing by red light. These results are obtainaible by the apparatus according to the invention, which comprises a casing closed by a cover having a lid or platen linked or hinged thereto, a frame being mov ably arranged in this casing under said lid and resting on members pressing upwardly such as springs or eccentrics, said platen pressin upon a transparent panel, shutting off the rame on its upper side and carrying a margin plate with an opening window corresponding to the dimensions of the print to be obtained within the margin lines. The cover is provided with an edge or border under the shutter, projecting over the frame and having a lateral stop for the purpose of adjusting the margin plate independently of the frame in always the same position.

The drawings show a preferred embodiment of the invention.

Referring to the drawings: I

Fi 1 is a perspective view of a photograp ic printing and developing apparatus 0 according to the invention. 7

Fig. 2 shows a detail of an internal part of the printing and developing apparatus.

Fig. 3 is a side view of the inside of the apparatus.

Fig. 4 is a vertical section through the back wall which is provided with ventilation chimneys.

Fig. 5 is a perspective view of the upper 0 part of the apparatus in the open position.

Fig. 6 shows a vertical section through the part shown in Fig. 5 which contains a plu rality of opal glasses.

Fig. 7 is a vertical section of Fig. 6.

Fig. 8 is a front view corresponding to Fig. 6 showing the negative inserted in position.

Fig. 9 is a vertical section of Fig. 8, similar to Fig. 7.

Fig. 10 shows a perspective view of the up per part as shown in Fig. 5 ready to receive the negative print, film or glass plate.

Fig. 11 shows a modification of the lifting means of the frame in the casing.

The printing and developing apparatus according to the invention consists of a casing 1, provided on its upper part with a rheostat or electric resistance 2 and a switch 3 (Figs. 1,'2 and 3) controlling an incandescent electric lamp 4 for white light and an incandescent electric lamp 5 for red light. A cable or wire 6 leads the electric current into the casing to the lamps. The switch 3 renders it possible to expose either to nonactinic red light, or to aotinic white light; the resistance 2 renders it possible to diminish the intensity of the while light according to the degree of transparency of the negative for obtaining a copy of the kind desired. The lamp 4 is fixed onto a slide 7 slidably within guides 8 and 9 (Fig. 2). The position of the slide within the casing 1 can be changed by means of cords or strings 10 and 11v which pass through the side walls of the casing 1. The purpose of changing the position of the lamp 4 is to weaken the contours given by the margin plate on the negative print.

In the lower part of the casing 1 is a drawer 12 having two or more compartments for receiving the copies after exposure or the papers for copies before exposure. A ceiling 13 prqvents light from penetrating into the drawer 12. The latter touches a vertical wall 14 betweenthe bottom of the casing and the ceiling 13, thus leaving a space for ventilation by means of openings 17 and 18 (Fig. 4). In the upper part of the back wall is an exhaust opening 19 for warm air which is protected by a chimney against the passage of light through it.

Wires

15 and 16 conduct electric current to the lamp and permit moving the slide 7.

A red window 21 at the side of the casing 1 enables the apparatus to be used as a red lantern during the development of prints. Hinges 24 provided on a lid or platen 22 render it possible to open the cover. The said laten 22 is lined or clothed with felt 25. he up r part of the front wall adjacent to the p aten 22 can be opened by means so as to form one half of a of hinges 38, 39 (Fig. 5) and is provided with a projectin sprin 26, which by means of its nose 27 ieeps the platen 22 closed. Below the closed platen 22 is a

movable frame

28, 29 provided with

horizontal rails

30, 31, 32 for carrying opal glasses, glass plates or-margin plates and the like (33, 34, 35 in Figs. 5 to 9). The

side walls

28, 29 of this frame are fixed to a back wall 36 (Figs. 7 and 9) and kept together at the lower part of their front side by a metallic bar'37. For putting

opal glasses

33, 34, 35 into the frame the hinged cover of the front wall is laid down as shown in Fig. 5

by lifting up two hooks 40 from their pins 41 fixed to this upper lid. For'reinforcement purposes, the flat sprin 26 is arranged hinge, the other half being fixed to the lower part of the front wall, thus transferring the strain into the half 42 of the hinge, i. e. to said lower part of the front wall of the casing 1.

Each

side wall

28 and 29 of the frame rests on a

metallic spring

43 and 44 respectively carried by two

rails

45 and 46 mounted on vtwo wooden borders or

rims

47, 48 on the side walls of the casin The

rails

45, 46

facilitate the sliding o the

springs

43, 44

when the

frame

28, 29, 36, 37 is pressed downwards. v v

The back wall 36 of the frame is guided by a vertical wall 49 within the casin A transparent panel 50 rests on the top 0 said frame, and carries an interchangeable metallic mar in cover 51 having an opening correspon mg to the dimensions of the print to be obtained or to the dimensions of the 1 negative print respectively. The upper edge of the front hinged cover is provided with a thin metallic border or rim 52Jprojecting in such a-ma-nner as to prevent the front edge of the margin plate on the panel 50 and the

frame

28, 29 from rising. A small portion of the back part of the frame meets with the under side of the cover adjacent to the platen 22, said underside being also provided along its whole length with a small projecting rim 53. In closed position the shutter 22 presses the

fpame

28, 29 slightly downwards so as to hold the sensitive paper'with the necwsary pressure against the negative, even if the negative is only a thin film.

The

frame

28, 29 is guided by

pins

54, 55 vertically movable in guiding

slits

56, 57. These pins are connected to a bridge member or-sti'rrup 61.,by

wires

59 and 60, said stirrup'surrounding.partiallythe casing 1, and being pivotally mounted in the side walls of said casing and being'furthermore provided with ahandle 62 at the front side for the purpose of lowering easily the

frame

28, 29 with in the interior' of the casing, if a negative 63 (glass or film) has to be introduced under the metallic rail 53 (Figs. 8 and 9). This having been done the margin plate is put of the casing for onto the negative in such a manner as to leave uncovered only those parts which are to be copied. The handle 62 is then released. The frame rises and the negative is kept immovable between glass panel and rim 53. The negative is ad usted in this manner for a number of copies not only by the immovab part of the cover, that is, its edge 64,

bu also by a lateral stop 65 perpendicular to said edge. Said stop passes into a slit provided on the platen 22 when the same is closed (Fig. 5). In this manner an equal margin on all copies will be obtained.

If it is necessary to avoid copying some ative glass plate or the film and according to the sensitiveness of the sensitive paper. When this has been done the red lamp 5 is lighted, the lamp 4 being at the same time automatically extinguished. The sensitive paper is then introduced, the platen 22 is closed and the red light changed to white light by actuating the switch 3. 'During the exposure the white lamp may be displaced by means of the

cords

10 and 11 in order to weaken the contours of the margin lates on the After exposure the red light is again copy. lighted and the sensitive paper is changed.

When all the copies have been made, the apparatus is used as a red lantern by lighting either the white lamp 4 or the red one 5 according to the sensitiveness of the paper exose p As'shown in Fig. 11 the

frames

28, 29 could also be lifted up or raised by means-of eccentrics 70 to be actuated from the outside pressing the frame on to the shutter 22 after 0 directly on said eccentrics or indirectly by inserting a metallic strip 71 between eccentrics and frame.

The casing 'is light-tight, the a paratus very simple, having no pegs but on y a sim: ple lever for lowering the frame. The mar-' gin plates can easily be removed or exchanged after having opened the front shutter, because only the uppermost margin plate is held at its front part by the rim 52 of the front shutter.

osing. The frame may rest;

tight casing,- a cover on said casing, illumiv nati-ng 'meansarran ed within said casing, a frame arranged a ve sa1d illuminating- 50 6. In an apparatus for obtainin photoa li ht adapted to cover t e upper means so as to be slidablewithin said casing, a platen forming. art of said cover and frame, a transparent panel on t 0 top of said frame upon which panel the negative is placed, a rim fixed to said cover located below the platen and projecting over said frame, a hinged front on said vcasing, a rim on said hinged front and means for pressing said frame upwards towards said rims in such manner as to hold both the negative and said panelfirmly in position between said frame and 'said rims even during the changing of the print.- I

2.. In an apparatus for obtaining hotographic prints, a combination as speci ed in claim 1, wherein said frame is connected with external means for movi it.

'3. In an apparatus for obtaining photo- 7 art of said 7 for obtaining photoing the latter upwardly against the platen a rim fixed to the cover along the side adj a cent to the platen, said rim lying under the latter and projecting over said frame, anel and margin plate, a lateral stop for a justing a negative independently of the frame, a hinged front on said casing, a rim on said hinged front projecting over the transparent panel and margin (plate, a spring member adapted to keep sai platen and said hinged front ,in closed position, a plurality of rails in said frame for insertion of different margin plates and 0 al glasses for regulating the lighting efiect o the electric light, and means on the outside of the casin for moving the frame" away from theto s utter.

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

LEON CRAYSSAC.

the positive, the negative and said 5. In an apparatus for obtainin' photographic prints, thecombination o a light tight casing, an'electric lam therein, means for shiftin said lam ,'a rame arranged above said amp and s 'dable in said casing,

- white-or the red lig ance for graduating the lighting eflct, means 1 for moving the white llght to and fro, a

I 5 frame arranged abovefsaid lights and slid a platen forming part of the cover of said casing and covering, the top part of said frame, a transparent panel on the top of said' frame, means for raising the frame and pressing the latter upwardly against the platen, a rim fixed to the cover alon the side adjacent to the platen lying under t e platen and projecting over the frame, a lateral stop for adjusting a ne ative independently of the frame, a hinged ront on sa d casing, a rim on said hinged front projectin" over the w transparent panel and means or keeping both the platen and the hinged front in close position.

graphic prints the combination '0 t' ht'ca smg, a cover on said casing,'an e ectrlc circuit within said'casing containing, an

electric white light and an electric red light, a switch for lighting and interchanging the t and anelectric resistable in said casing, aplaten forming part I top of said frame, a margin plate on the top ofsaid frame, a panel under said margin plate, means for raising frame and pressof the cover of said casing and covering the I