US1062294A - Photographic-printing apparatus. - Google Patents

Description

Patented'May 20, 1913. k 2 BHEETSfBHEET 1. a A

L. J. MITCHELL.

PHOTOGBAPHIG PRINTING APPARATUS. v APPLICATION FILED JUNE 8, 1911. 1,062,294.

'MSI 1 L. J. MI'JICHBLL. l PHOTOGRAPHIG PRINTING ATPABATUS. APPLICATION FILED JUNE 8, 191'1.

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Patented May 20, 1913.*

fUNiTED STATES PATENT OFFICE' Apparatus,

LoUIs J. lislu'rcHELL, 0E EitEsNo, oA'LrEoENrA.

PHo'roenArrrIc-PEINTING AEPAEATUS.

T all Awhom t may concern Be it known that I, LOUIS J. MITCHELL, citizen of the United States,` residing at Fresno, in the county of Fresno and State of California, have invented new and useful Improvements in Photographic -Printing of which the following is a specilication.

Y A This invention relates to appara-tus for 1-0' the printing andexposure of photographic vfilms and plates.

VThe object of the present `invention is to provide a simple,

ratus wherein may be exposed and printed,

photographic .or other sensitized negatives,

films, or sheets of material; andf'to provide an apparatus which can' be operated quickly.

and effectively and is adjustable "to accommodate photographic paraphernalia of different sizes and in which the-devices to be' exposed or printed maybe subjected to natural or artificial light rays.

` verse, horizontal section on Other objects of theI invention will be made manifest in the followingspecifica- 25.

tion.

The invention consists of the parts and the construction and combination of parts as' hereinafter more fully -described and claimed, havinglreference to the accompanying drawings, in which- Figure 1 is a vertical, transverse section through the apparatus. Fig. 2 is'a transthe'line XX, Fig. llooking downward. Fig. 3 is a view ofthe plate holder. Fig. 4 is a view of the lamp frame. Y

The present invention comprehends a device for the exposure ofy sensitive photooperators graphic paper, films, or plates,

and includes in its illustrated embodiment a casing 2 of suitable material, shape and size, which is provided adjacent to one of its sides with brackets or devicesg by whichv the casing 2 may be suspendedin juxtaposition to an opening through casing 2. The casing 2 is provided with an casing, and a front board 5 forming the front of the casing, and in thisis provided an opening, as 6, of-suitable area to'be disposed with relation to a window or other opening so that light may -have access tothe interlor of the'casing 2.A

Upon the outer si e of the back 4, which Specification of Letters Patent.

Application filed I une 8, 1911.

substantial, portable appaan. opening 13, of

'tive .sheet or film is reproduce which naturallight rays- P `may be admit-ted into the interior of theboard 4 forming the back of the i Patented May 20,1913. seriaiNp. 632,083. v

may be arranged in a vertical position, is mounted aplate holder 7, of suitable material and size, adjustably clamped against the back 4, by means ofa screw or other equivalent device 8 passing through a slot 9 made in the upper portion of the plate holder 7. The lower vertical edges of the plate holder 7 are bent to form plate receiving flanges 10, of sufficient width to receive between their facing edges a negative, indicated at 11, which is supported by stops 12 adjacent to the lower edge of the plate holder 7. The platehlder is provided withsu cient area to practically expose the entire area of the negative when the latter is placed inposition against the rear of the plate holder 7 and between "theflanges 10. When pictures or negatives of different sizes are tobe exposed to the light, ldifferent sizes of plate holders may be provided to accompany the apparatus and that particular plate holder 7 which is b est Iadapted to f it a given negative may be 1nserted in position upon the back'4 of the apparatus and clamped in its proper adjusted position by the screw 8. That portion of thev back 4 of the casing 2 which is adjacent to the normal position of the plate holder 7, is made with an openingv 14 of approximately the size of the largest plate to be exposed in the casing.- The opening 14 is closable normally by a pair of coperative shutters 1 5, vertically pivoted upon spindles 16, which are mounted in bearing flanges 17, attached-to a"frame 18 surrounding the openingt14 in the back 4. In the normally closed positionthe shutters 15 are swung toward andv overlap each other effectively' cutting out the lightrays coming -through the opening '6 of the front of the apparatus, thereby permitting the operator to adjust a sensi- 19' in position` upon the indicated at 11, whereby a picture d upon the sensitive ymedium 19 laced against the negative 11. l

Secured to the -outside of the back 4 of 'the apparatus, and below'the exposure opening 14, is a guide nal recess 21 formed in its side adjacent to the surface of the back 4. In this recess there is loosely mounted a movable stop strip 22, vapproximately equal in length to the length of the recess height to be approximately even with the lower edge of the opening 14, and adapted negative,

block 20, having a longitudi- 21, :ind ofl suiiicien v spring 36, releases `the to be pressed forwardly to rest under the lower edge of the negative 11, when inserted in the plate holder 7, by expansible springs 23 concealed in pockets 24 formed for its reception in the vblock 20. The function of the vstop strip 22 is to support the sheet of sensitized material or paper 19, when placed by the operator against the negative 11 inv the plate holder 7, so that the lower edge of the sheet 19 to Vbe printed will rest upon the upper horizontal edge of the-stop strip 22. Having thus inserted a sheet 19 to be printed against the negative, the operator depresses a pedal 25, so as to pull downwardly an expansible link 26, here shown in the form of a tightly coiled, helical spring, to the upper eye 27 of which is connected a cord or other suitable flexible connection 28, passing over a guide roller 29 appropriately mounted on the back of the apparatus. The other end of the flexible connection 28 is then connected at 30 to a lever 31, which is pivoted in bearings 32 fastened upon the surface of the back 4.

The lever 31 is bent across from the ivoted portion supported in the brackets 32 to form a bail 33 the back 4 of the apparatus. Upon the bail 33 rests a pressure pad 34, hinged at 35 and adapted to be swung upwardly about its pivots or hinges 35 when the operator depresses pedal 25 and rocks'the lever 31 on its bearings 32, so that the tion of the bail 33, engaging the back of the pad member 34, forces this forwardly against the sensitized paper 19 and holds this firmly against the negative shown at 11. as the operator depresses the pedal 25 and keeps the flexible link 26 under sutiicient tension to hold the bail 33, by reason of its lever 31 and the flexible connection 28 under sufficient tension, a firm pressure is maintained o-n the sheet, As the operator releases the pedal 25, the lever 31 is released and the pad 34 is quickly about its hinges 35 by a contractile spring or` equivalent device 36, connected at one end adjacent to the upper'portion of the pad 34, and the other end is connected to a projecting portion 37 of the back plate '4. The pressure pad 34 being swung backwardlyunder thecontractile action ofthe printing paper 19 from pressure against the negative 11 and if permitted to swing back very 'quickly the pressure pad 34, having fastened on its rear surface a flexible abutment member 42, the

latter will trip a pawl 38, hinged at 39, and. pawl suiiiclently o pull rapidly rock the backwardly the stop strip 22, whic is Sconnected to the pawl by a, link 38 passing through an opening 38a formed adjacent to the upper edge of the block 20. The tripping movement of the pawl 38 is at times so rapid that the card or sheet 19 does notl reaching horizontally across .pawl 38 the arm 42 horizontal por-y drawn backward.

channel 40 provided between the plate 20 The channel 40 leads to ay j vided to catch the sheets as they are allowed to fall, as will be explained later.

The object of preventing the release of certain of the printed sheets 19 is to allow the operator to pick the sheet from in position behind the to obtain proofs for determining the length of time of exposure. To obtain these proof copies he releases the pedal 25 quickly, as

before stated, so that the spring arm 42 on the back of the pressure pad 34 will trip the pawl 38 very rapidly.

If the operator releases the pedal gradually, the action of the spring 36 connected to the pressure pad 34 is the pad 34 will swing back slowly and the abut-ment arm 42, fastened to the back of the pad 34, engages the projecting pawl 38 and this will be sustained in a partly open positionby the arm 42, thus allowing the pawl 38 to slowly swing on its pivot 39 and actuate the stop strip 22 to release the printed sheet 19. When the operator inserts the next sensitive sheet 19 into position behind the negative and pressesfirmly upon the outwardly tilted, pressure pad 34, which is temporarily interrupted in its movement by the abutment of the arm 42 upon the will yield outwardly and pawl 38, which yielding action 1s automatic when the pedal 25 is released rapidly and the spring 36 allowed to exeroise its full contractile tension or pull on the pressure pad 34. After fonce -having obtained a proof and determined the time of exposure a given negative requires to produce good prints, he no longer has to release pass over the the pedal 25 rapidly but may allow it to riseA slowly, as the contractile spring 36 will pull back the pressure pad 34 and through the instrumentality of the' pressure pad 34 thus will depress the bail 33. The pawl 38 is sustained in its normal vertical position by reasonf of the expansion of the spring 23 pressing against the stop strip 22 which is connected to the pawl 38 by the link 38. When the pressure pad 34 swings backwardly and the yiel'dable arm -42 engages the pawl 38, t-he latter is rocked, pulling on the link 38 and so moving the stop strip 22 as to permit a printed strip, resting upon its upper horizontal edge, to slip downwardly into the receiver 41. When the yield'able arm 42 has swung a given or limited distance,the pawl 38 becomes released-and is pulled backwardly into vertical normal position, and the stop strip 22 again assumes a position to receive and support upon its upper edge the next inserted card or sheet The foregoing portion of this description relates to the means for holding a negative and pressing a sensitized sheet in posiretarded, so that receiver 41 pronegative 11 when he desires tion against the negative so that the sheet can be exposed to light rays. This exposure of the sensitized sheet or strip to light rays `is lcontrolled, 'as' hereinbefore stated, by

by depressing the pedal 25 through means of its connections 26 and 28 with the lever 31, the shutter members are then automatically opened by reason of suit-able connections? with 4the pedal 25. These connections comprise in the present'instance-a yflexible link or cord 43, one end of whichis conneted to the lower eye of the spring 26, and then passes upwardly through the spring over vthe guide roller 29 and other guide rollers 44 and is then connected to a crank arm 45 at the lower end of one of the spindles 16. The other crank arm 45 is con` nected to a contractile spring 46, one end of which is fastened to a stationary projection orrpart 47 on the inside of the cover member 4." V I lVhen apull is transmitted to the crank arm 45 through the depression of thepedal 25`andv the connection 43, the crank armv swings in an arc to open one shutter 15,at-

the upper end of the supporting spindle 16 of which is formed another crank arm 48 swinging in an 'arc similar to that of the lower crank arm 45.t The upper crank arm 48 is connected by a transversehorizontal link 49 to a crank 50 formed upon the spin-A dle 16 of the other shutter section; the relation of the cranks 48 and 50 bein'g as shown 1n Fig. 2, that. is, one at substantially right angles to the other, so that the link 49 will swing the crank 50 and its shutter section 15 to open the latter.

Q For the purpose of permitting the sensitlzed sheet to betirmly pressed against the negative bythe pressure pad 34 before the' shutters 15 are opened, I make the flexible link or cord 43, which operates the shutters, sufficiently longer vthan the cord 28,which Voperates thev pressure pad, to allow the spring 26 to become operative to pull the cord 28 as soon as the pedal' 25 is depressed.

When the pressure pad 34 is topped in its motion by thev face of the negative, Vthen further pressure on the pedal 25 causes the spring 26.to distend s0 that the lower eye moves away rom'the u per eye 27 and thus takes up the slack in t e cord 43 which is connected to the lower eye of the spring.

.Assoonas the cord 28 has become tight and.

the pad 34 ress'ed against thefnegative, then whenA the s ack is taken out of the cord`43 -pulling on the tappet of ciently to be encountered and depressed by the distension of the spring 26 and the 'cord 43 becomes tight, this will pull on the lower'crank 45 of theshutter spindle and swing the crank in an arc of approximately 90 or more and at the same time shift the horizontal link' 49', mounted on the upper cranks 48 and 50 by their respective shutter spindles 16, to open the other shutter 15.

In operation,

paratus, he may place against the negative and in front of the pad 34, a sensitive card or sheet and by depressing the pedal 25 pulls the pad 34with firm pressure against the sensitive card so as to hold it in close contact with the negative. As stated, immediately after the pad has been swung into position against the negative, a further movement of the pedal takes the slack out of "the operating cord 43 and the shutter sections 15 are swung open to allow light to have access to the interior of the casing 2 and 'through the opening'14, thence reaching the"I sensitized cardlor print through the negative. Having determined by trial'the length of time that each print should be ex posed, theoperator releases pressure from the pedal 25 when the shutters have re-, --mained open a .certain 'length'.of time,

4and

they are automatically closed.` by theconafter the voperator has ad-A A justedl the negative from which prints are to Y be made over the' opening 14 of the ap-l traction of the spring 6 which is dist-ended j when'the cord 43 'pulls lon the crank 45.V

The closing of the shutters4 15 takes place at th primaryupward' portion ofthe movement of the pedal 25. vAs soon as they are closed the spring 36 becomes eHective Vto pull backwardly the pressure pad 34 and permits the abutment arm 42 to engage and swing backwardly the pawl 38 this in turn the stop strip 22 trom the top edge of which the printed card or sheet falls- 4 through the channel' 40 into ythe receiver 41.

It is important lin photographic establishments wherevarious numbers lofprints of diere'nt negatives are being cdnstantly produced, that the operatorbe relieved of the burden of keeping a metal tally of the number of printstfrom each negative. For this purpose I, have shown mounted uponv the back plate 20 a suitable counting device 50,

which projects upwardly suiby the pressure pad 34 when this is swung back fully so that each printl released by the opening of the pressure pad 34 will-fbe counted and registered' uponv the counting v device 50a. vThis' apparatus may be used in natural light or, when necessary, the ex-y posures can be made by artificial hght by reason vofthe closing of a suitable electric circuit 51 at the proper instant, `preferably just before the shutters 15 are opened. circuit 51 includes contact members 52, one

of which is stationary andthe other being The is moved, the shutters moved into circuit closing engagement with the stationary member. As shown, the stationary member 52 may be mounted upon the back 4 of the apparatus and the movable member mounted upon the pad 34, so t-hat when the t-wo members are brought into contact a circuit will be completed through wires in the circuit 51 to cause the illumination of incandescent lights 53 fastened in suitable sockets having connections in the circuit 51; the lights being mounted in a detachable frame 54 which may be connected to the casing 2 by means of the brackets or fastening devices indicated at 3.

Having thus described my invention,what I claim and desire to secure by Letters Patent, isv I. A- photographic printing apparatus comprising a suitable casing having a front and a back, each having an opening, shutters pivoted at the sides of theopening and operating inside of the casing, a foot pedal,`

a link connecting the shuttersfor Ysimultaneously movmg the same, a spring for maintaining the shutters closed, a Hexible, re-

silient device connecting the pedal and one of the shutters whereby,. when the pedal v are opened, a tiltable actuator journaled on the casing, a medium connecting the actuator and said pedal, an automatically opening platen pivoted on the back and bearing upon'the tiltable actuator, and a p ever the opening therein against a plate 1n which may be held a sensitized sheet, said actuator being effective when the pedal is pressed to force the platen up, further moveate holder adjustable upon the backv ment of the lever acting through the flexible l device to open the shutters.

2. In a photographic print-ing apparatus, the combination of a casing having a back with an aperture,l shutters pivoted at the sides of the opening, a link connecting the shutters to operate the same in unison, a spring for automatically closingthe shutters, a pla'te holder on the back and'adjacent to the opening, a collecting box below the aperture, a sheet stop at the lower edge of the plate-holder in a recess formed for its reception in the casing, springs projecting the stop forward beneath the edge of the plate-holder, a conduit extending from the stop to the collecting box, a tripper con'- nected to the stop for pullingy it back to openthe conduit to allow printed sheets to drop, a platen for pressing sheets on a negative, its retracting spring, a resilient arm on the platen for engaging the tripper, a tiltable actuator journaled on the case for pressing 'the actuator against the plateholder, a pedal, a connection coupling the pedal and the actuator, and an eXtensible connection coupling the pedal and the shutters, the initial movement of the pedal lifting-the platen and the subsequent movement opening the shutters and operating conversely on the release of the pedal.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses. l

' LOUIS J Q MITCHELL. Witnesses J. W. HARPER,

G. McCULLooH.

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