US1167857A

US1167857A - Photographic-printing machine.

Info

Publication number: US1167857A
Application number: US2785315A
Authority: US
Inventors: Eric A Thorberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-05-13
Filing date: 1915-05-13
Publication date: 1916-01-11
Anticipated expiration: 1933-01-11

Description

E. ALTHORBERG. PHOTOGRAPHIC PRINTING MACHINE.

- APPLICATION FILED MAY 13, 1915.

' 1,167,857, I Patented Jan; 11, 1916.

E. f7 THOHBEHG is a specification, reference being UNITED STATES PATENT OFFICE.

m A. rnonnnne. or BISMARCK, NOR H DAKOTA.

rnoroenarnrc-rmnrme macnnm -machine for use in-printing pictures either I from plates or films, and in which electric lightis used as a printing agent.

The primary ob ect of my invention is to provide a very simple, compact, and effective printing machine, particularly adapted for small negatives and including a casing provided in its bottom with an electric light and having ,a'cover, which, when closed down to confine the negative and sensitized paper in a position, to be printed, will automatically close the circuit through the light, and which, when opened to remove the printed picture and film, will automatically break the circuit through the light.

A further object of the invention is the provision, in connection with a-photographic printing casing of the character described, of means whereby. a dry battery may be supported within the casing whereby to energize the electric lamp mounted therein.

A further object of this invention-is to provide a manually actuatable switch in con- 'nection witha lamp circuit as well as a switch controlled by the opening and closing of the cover of the casing whereby the circuit through the lamp may be broken by the actuation of the switch, and in this connection to provide akey, which, when removed, will break said circuit, and which, when in place, will close the gap in the circuit.

A further object of the invention is to so construct the machine that it may be used either for printing from filmsv or fromplates. 7

Still another object of the invention is to provide means whereby the electric lamp mounted within the casing may be electrically connected to anysource of power exterior to the casing where it is not powble or desirable to use the dry batteries previously referred to.

Other objects the following description.

Specification of Letters 2atent. Application filed May 18, 1915. Serial No. 27,853.

- corner of the casing; Fig. 5 is a fra sectional view of one end wall of t e casing showing the key switch whereby the circuit will appear in the course of Patented Jan. 11, 1916.

My invention is illustrated in the accompanying drawing, wherein:

Flgure 1 is a perspective view of my photographic printin device; Fig. 2 is a vertical section thereo parallel to the front of the casin and looking toward the front thereof; g. 3 is a fragmentary sectional view of one end wall of the .casing, showing the means for raising the cover; Fig. 4 is a fragmentary sectional view of the rear lower through the lamp is closed.

Referring to these drawings, 2 designates a box or casing which is shown as rectangular in form and which may be made of any.

suitable material, such as wood or metal, but which will be preferably made of wood. Disposed below the upper edge of the side wall of the casing is a ledge or flange 3 adapted to support a glass plate. Mounted upon the upper end of the casing is a cover 4 which ispreferably hinged to the casing,

as at 5. Attached to-this cover upon its inside face is a strip of cloth or felt, designated 6.

' The bottom 7 of the casing 2 is likewise hinged to the casing by hinges 8 so that the bottom may be. opened up, and mounted upon this bottom are the spring fingers 9 for detachably supporting a dry battery in place upon the bottom 7. Disposed above the bottom 7 in spaced relation thereto is a false bottom 10, upon which is mounted a socket 11 for the reception of an electric lamp base, and preferably made in one piece with this socket is a reflector 12 which is oblong or oval in form.

The socket 11 is adapted tobe connected to a dry battery 11 by means of a wire or conductor '13 which is arranged in any suitable manner within the space between the bottom -10 and the false bottom and which is adapted to operatively engage 'one of the Egles of the battery 11. The lamp 14 may of any suitable character, but preferably 1a tungsten lamp is used, and one of the terminals of. this lamp is adapted to electrically engage a sprmg contact 15, mounted upon the lower face of the false bottom 10, this sprin contact being in turn electricallz1 enga 'ch leads with a conductor or wire 16 w entary upward in any suitable manner through the casing or box, as for instance through channels formed in the side wall of the box, to a spring contact 17 constituting a normally open switch or circuit breaker which coacts with the contact 18, this contact 18 being in turn connected by means of a wire 19 to the other pole of the battery in a manner which will be later stated.

The spring contact 17 and the contact 18 are preferably mounted in a recess 20 formed in the upper edge of the box, preferably upon its front wall. When the cover 4; is entirely closed the front edge of the cover will contact with the spring 17, causing it to electrically engage the contact 18 and close the circuit through the lamp. When the cover is raised, however, the spring 17 breaks the circuit through the lamp and battery.

Preferably the wire 19 leads to a metallic sleeve 21 which is mounted in the wall of the casing 2 and which is spaced from a spring contact 22, this spring contact being in turn electrically connected by means of a wire 23 to the opposite pole of the battery to which the wire 13 is connected. There is thus a break in the circuit between the battery and the lamp, not only between the spring 17 and the contact member 18 but between the sleeve 21 and the contact 22,

and this gap, between the sleeve 21 and the contact 22 is closed by means of a key 24 which is insertible into the end of the box through a key hole 25, and this key, when inserted, will close the gap at this point. The key is formed with a notch 24 in it, and a spring 24 just inside of the key hole opening engages with the notch and holds the key firmly in place but permits the key to be readily withdrawn. The key 24 practically constitutes a switch manually operable for the purpose of breaking the circuit of the lamp even though the cover is securely closed, thereby saving the battery. Until the key is inserted in the key hole 25 there is no possible chance of the battery being used .up by having the cover of the machine closed. Preferably the cover is urged to a partly open position by means of-a spring actuated plunger 26 mounted in a recess in the end wall of the casing 2, and the cover may be held down or closed either by hand or by means of a latch 27.

Preferably, and in order that the machine may be connected to a source of electricity exterior to the casing or box, I connect the

wires

23 and 13 by

wires

28 and 29 to binding posts 30. By this means the batteries, such as ordinary dry cells, storage batteries, or batteries used on automobiles, may be connected to the machine, or the machine may be used in connection with electric lighting.

In the practical use of my invention when printing from film negatives, the film and sensitized paper are disposed in the usual manner upon a glass plate 31 which is sup ported upon the ledge 3. Immediately thereafter the cover 4; is closed and this, through its engagement with the spring 17, closes the circuit through the lamp and battery, provided of course that the key 2 1 has been previously inserted in position. After a sufficient time has elapsed, the cover is released, whereupon it will immediately spring up under the action of the spring pressed plunger 26, and the "circuit through the lamp will be broken. The negative and print may be thenremoved and a new film substituted. Where a plate negative is used the glass plate 31 is of course dispensed with. i

In the practical use of my machine I intend that it shall be equipped with an ordinary dry cell or set of cells of small voltage, as for instance, about four volts, together with an electric bulb of the same voltage. It is, of course, to be understood that the invention is not. limited to any voltage. Of course when a storage battery is connected to the lamp, a lamp of the same voltage as the storage battery must be used.

This printing machine is of particular advantage to those who do not live where electric light is available, and by its use prints from negatives of medium denseness may be made in from eight to twelve sec and, therefore there is no possible chance of the battery. being used up without doing its roper work.

aving thus described my invention,

what I claim is:

1. In a photographic printing machine, a casing having a bottom movably connected therewith and a false bottom spaced from the first named bottom, a lamp operatively supported upon the false bottom, means 1n the casing disposed above the lamp for supporting a negative and sensitized sheet, a cover movably connected to the casmg, means in the space between the first named bottom and false bottom for supplying the lamp with electricity, and a normally open switch in said casing and in the lamp cir- .cuit, said switch being engageable by the negative and sensitized sheet, a cover mov-- ably connected to the casing, a battery removably disposed-upon the first named bottom, means for electrically connecting one of the poles of said battery to one of the lamp contacts, means for velectrically connecting the otherpole of said battery to the other contact of the lamp, including a spring member with which the base of the lamp is adapted to engage, and normally spaced contacts mounted upon the upper edge of the casing and included in said connecting means and adapted to be placed in electrical engagement with each other by the closing of the cover;

3. In a photographic printing machine, a

casing having a hinged bottom, a false bottom disposed above the hinged bottom, a lamp operatively 'supported'upon the false bottom, means in the casing dlsposed above the lamp for supporting a negative and sensitized sheet, a cover hinged to the casing, a battery removably disposed upon the hinged bottom, means for electrically connecting one of the poles ofsaid battery to one of the lamp contacts, and means for electrically connecting the other pole of said battery to the other contact of said lamp including a spring member with which the signature in the presence of two. witnesses.

ERIC A. THORBERG.

Witnesses: LILLIAN C. THonBnRe, IDA K. THORBERG.