US945697A - Photographic-printing apparatus. - Google Patents

Description

PHOTOGRAPHIG PRINTING APPARATUS.

APPLICATION FILED 31111.3(),1909.

Patented Jan. 4, 1910.

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. i q WILLIAM B. CONAWAY AND CARROLL L. STEVENS, OF AURORA, INDIANA.

PHOTOGRAPHIG-PRINTING APPARATUS.

Patented Jan. 4, 1910.

Application filedhJanuary 30, 1909. Serial No. 4?5,104..

' mechanism to illuminate the print or printing frame for the desired length of time, and then cut off the light.

Another object is to provide means whereby th sp ed of the driving or transmitting mechanism can be varied to provide for long exposures or short exposures.

Anotherobjcct is to provide improved means for controlling the lighting circuits.

lt further consists in certain details of form, combination and arrangement, all of which will be more fully set forth in the description of the accompanying drawings, in Which Figure 1 is a horizontal section on line 2) o of F 1g. 2. through the dials and cabinet,

front, and showing part of the driving and light controlling. mechanism in elevation. l ig. 2, is a front elevation of the dials, with part of the cabinet broken away to show the driving mechanism, part of which is shown in elevation and part in central section. Fig. 3 is a perspective view of a sliding latch plate detached. Fig. 4, is a plan view of a. clutch ring and its clamping lever (16-' tach ed. 7

' ()ur improved mechanism is adapted to be used in connection with a cabinet having one or more openings to receive photographic printing frames. and within the cabinet preferably a series of electric lights so arranged to illuminate the face of the print ing frame when in circuit.

In order to secure with accuracy the exact quantity of light necessary to print the photo raphs we provide 'one or more dials A,-A one for each printing frame, which are preferably secured to the wall a of the cabinet, preferably below the respective printing compartments. Hands or pointer members B B are loosely jouri'ialed so as to ,travel over the face of the dials, and when clutched to the driving mechanism. to be driven at a uniform rate.of speed o fer the face of the dials until they reach the zero point on the dials when they are automatic ally tripped to release the clutch mes-hair ism, and also to break the circuit through the lights which, illuminate the printing frame.

The pointer, members are power driven preferably by an electric motor C- of either shunt or alternating type, which we find will, under ordinary circumstances rim a a sufficiently uniform rate of speed for me purpose. The motor shaft /,--is provided with a worm which meshcs ,with and drives a worm wheel D loose on shaft E. The hub of worm wheel D carries a pinion (l and a clutch member (.l', which also travel loosely on shaft E. A spur gear ]L- carried by a shaft H meshes with and is driven by pinion d. Shaft H is supported in a journal box ll, and at. its opposite end carries'a pinion h which meshes w th and drives a spur gear F loosely mounted on shaft E, said gear F carrying a clutch member f. The ratio of the gears (Z /r h F is preferably such that the gear I travels at one fifth the speed of the pinion- (Z.

The shaft E is mounted in journal boxes 0 e and provided at opposite ends with worms G G- which mesh with and drive worm wheels 9 g which are rigidly secured to the hollow shafts I I which are gournaled in the hubs a of the dials A. The forward ends of the shafts I I are enlarged to form clutch members 'i 1 to which the pointer members B B are clutched when in use. A clutch member J splined to the shaft E is adapted to be shifted endwise on shaft E by means of a lever 5 which is pivoted to the journal b0); 71 so as to shift clutch memher J into engagementwith clutch member d or clutch member 7' as desired, to change the speed of shaft E relative to that of motor c.

The pointer members B B are ivotall supported in position by means o'f yokes attached to their inner faces andjournaled in recesses 1) formed in the clutch members i i. Iointers B B are provided with ring shaped clutch members K ivotedfto the pointers at 70 and split at 70 andqadapted to grasp the clutch members i iand to thereby cause the pointers, B, B, to travel over the face of the dial. The ends, [0 k of the split ring are closed togethertri grasp the member, 2', or 2', by means of a lever, 70*, which is let into a recess, 7c, in the ends,

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tacts and an electric light employed to illuminate a photographic print, while said pointer is engaged with and being driven by said shaft, and to break said circuit at said electrical contacts open said circuit when said pointer is disengaged from said shaft.

4. In a mechanism of the character indicated, an electrical circuit, an indicating dial, a pointer adapted to travel over the face of said dial, a shaft adapted to drive said pointer, a clutch member carried by said ointer adapted to alternately engage and disengage said shift, a motor adapted to travel at a asbstastiall uniform rate of speed, speed changing mec anism interposed between said motor and said pointer driving shaft, means controlling the change of speed of said pointer driving shaft relative to the speed of said motor, and a spring actuated latch carried by said pointer, the movements of said latch controlling the movements of the clutch member employed to clutch said pointer to its driving shaft and to control the movements of a contact serving to open and close said electric circuit in which is included an electric light em-' ployed to illuminate a photographic print, and means to actuate said latch to stop said pointer at a predetermined point.

5. In a mechanism of the character indicated, in combination with one or more indicating dials having pointers adapted to travel over their faces, with means for automatically tripping and stopping said pointers at predetermined points, a motor adaptedto travel at a substantially uniform rate of speed, a shaft adapted to receive motion from said motor at different ratios of speed, means for changing the ratio of speed of said driven shaft, and mechanism transmit ting motion from said driven shaft to one or more shafts employed to drive said pointers.

6. In a mechanism of the character indicated an indicatin dial, a pointer adapted to be driven over t e face of said dial at a substantiallynniform rate of speed, a clutch member carried by said pointer and adapted to engage and disengage said pointer with its driving shaft, a spring actuated latch moving in unison with said clutch, means for tripping said latch at a predetermined point to release said clutch and sto the pointer, a pair of electrical contac s forming the terminals of an electrical circuit, and a contact actuated by the move-' ments of said latch to closeusaid electric circuit at said electrical contacts @hile said clutch member is engaged to mve said pointer, and to open said circuit when said clutch member is disengaged.

In testimony whereof we have affixed our signatures in prmence of two Witnesses.

WILLIAM B. CONAWAY. CARROLL L. STEVENS.

Witnesses:

CASSIUS W. MCMULLEN, HARRY R. MCMULLEN.

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