US783639A - Photographic-printing machine. - Google Patents

Description

PATENTE D FEB. 28, 1905.

W. T. MEAD. PHOTOGRAPHIG PRINTING MACHINE.

APPLICATION FILED DEC. 10. 1904 2 SHEETS-SHEET l.

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No. 788,639. PATENTED FEB.28, 1905. W. T. MEAD.

PHOTOGRAPHIG PRINTING MACHINE.

APPLICATION FILED 1330.10. 1904 2 SHEETS-SHEBT 2.

Z/IJZIZeJJQJJ I 7, fnvenZor. 1 \J a 6 (Cr/ N fag W J UNITED STATES Patented liebruary 28, 1905.

WILLARD T. MEAD, OF BUFFALO, NEWV YORK.

PHOTOGRAPHlC-PRINTING IVIACHlNE.

SPEGIFICATIONforming part of Letters Patent No. 783,639, dated February 28, 1905.

Application filed December 10, 1904. Serial No. 236,261.

To (ti/Z 11/71/0171, it ntay c0n0c7'n:

Be it known that LVVILLARD T. MEAD, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Photographic-Printing Machines, of which the following is a specification.

This invention relates to photographicprinting machines of that kind comprising a rotatable drum having a transparent peripheral wall and an enveloping curtain, between which the sensitized print paper or sheet and tracing or transparent original are introduced and subjected for a period of time to the ac tion of light within the drum to produce the print.

The invention is especially directed to machines for making blue-prints from tracings, but is not limited to such use.

The primary object of the invention is to provide an efficient practical photographicprinting machine of simple and inexpensive construction which can be fed or charged with rapidity and ease and discharged with equal facility.

In the accompanying drawings, consisting of two sheets, Figure 1 is a side elevation of a photographic-printing machine embodying the invention. Fig. 2 is a transverse sectional elevation thereof. Fig. 3 is a longitudinal sectional elevation thereof. Fig. 4 is a side elevation of a modified construction.

Like letters of reference refer to like parts in the several figures.

A represents a. stationary frame, which may be of any suitable form and construction, that shown consisting of connected sides having upright bearing extensions (1 for the rotatable drum and forwardly-mojccting arms or extensions a.

B represents the drum or cylinder, which preferably consists of two circular skeleton ends or heads I), which support and are connected by segmental cylindrical plates 0 of glass or other suitable transparent material. The heads of the drum are connected between the glass plates by bars or strips 0, which constitute supports for the longitudinal edges of the glass plates. A drum having a con tinuous cylindrical glass wall could be employed; but such construction is more expensive than that described, which is strong and desirable for ordinary work where excessively large prints are not required. A cylindrical drum is preferred; but a polygonal drum could be used. The drum is mounted to rotate about a horizontal axis in any suitable man n er. For instance, it is supported on fixed journals (Z, projecting inwardly from the bearing extensions a of the stationary frame, and it is turned by suitable means, the ends of the drum being provided with circular hand rails for this purpose. Any other means for turning the drum can be used.

F represents lamps which are located within the drum and furnish the light for printing. The electric lamps shown in the drawings are carried by a supporting bar or frame 7", secured to the inner ends of the stationary journals for the drum, and they are supplied with current by wires entering the drum through one of its journals or in any other known way. One or more lamps are employed, as may be found necessary.

Gr represents a curtain or apron, of thin flexible material, which is attached at one end to and is wound upon a roller H, arranged parallel to the drum, and is attached at its other or free end at it to the cylindrical wall of the drum B. The curtain-roller II is journaled in fixed relation to the drum in suitable bearings /1.' on the frame A and is provided with means for revolving it in a direction to wind the curtain thereon. A spring-operated roller,- such as the well-known window-slnule roller, can be used and is shown in Figs. 1 and 3. or the roller can be revolved to wind up the curtain by other means, such as a weight-motor H. (Shown in Fig. 4E.) \Vhen the drum B is turned forwardly, as indicated by the arrows, Figs. 1 and 3, the curtain (i is unwound from its roller and wrapped around the drum, the spring or weight for the curtain-roller being thus wound up. and when the drum is turned backwardly the roller H automaticall y rewinds the curtain thereon. The automatically-winding roller H always exerts a suflicient pull on the curtain to draw it taut around the drum, and thereby hold the tracings and print-paper securely against the transparent ioo wall ol the th-umand prevent thedisplacement and more reliable than it a vertical cylinder of the same.

in the machine shown in Figs. 1 to 3 the curtain-roller is yournaled in the tor\vardly and curtain were employed. l claim as my invention W l. The combinationot'a rotatable drumhav- 5 projecting arms m ol the frame, and the curing atransparent peripheral portion, a source 5 tain extendstherefrom in a substantially horiof light within the drum, a curtain attached at zontal direction to the drum, passing over 2 one end to said drum, and a roller to which the guide and supporting roller which holds otherend ot'said curtain is attached,and which the curtain up against the cyliinlrical wall of is rotated in fixed relation to the drum to wind 10 the drum. 'llhe guide-roller at all timesholds said curtain thereon,substantially as set forth. 7

the curtain against the peripheral lace ol the 2. The ctnnlnnationota rotatabled rum havdrum, and while the curtain-roller itself could ing a transparent peripheral portion, a source be located at the place occupied by the guideof light within the drum, a roller iournaled in roller and the latter dispensed with, as illusliXed relation to the drum, a curtain attached 5 trated in Fig. i, in which H re 'iresents the to said drum and to said roller and whichis 75 cin'taii'i-roller, such arrai'igement is not so 1 unwound from said roller by the rotation 01 desirable, because the curtain-roll decreases t the drum in one direction, and means for rein diameter as the curtain is unwound therevolvingsaid roller t0 rewind thecurtain therefrom and the curtain may not at all times be on when the drum is rotated in the opposite held lirmly against the drum. The guidedirection, substantially as set torth. 8o roller .l is preterably pressed ,\ieldin$ 1,'l.\ i 3. The combinatioi'i ot a rotatal)ledrumhavagainst the drum 'by springs beneath its i inga transparentperipheral portion, a source journals, so as to hold the curtain tightly o1" light within the drum, a curtain attached against the drum and prevent injury to the at one end to the drum and adapted toenvehip 5 latter in case a hard object should be carried the drum when the latter is rotated in one di- 8 between the guide-roller and the drum by the rection, a guide-roller over which the curtain curtain. A horizontal teed-board li, suppasses, and meanstor maintaiiiing the curtain ported by the frame-arms 1/ in trout ot' the taut at all times, substantially asset lorth. curtain -rollcr H, is preferably employed. 4t. The combination ol a rotatabledrumhav- 3 which, together with the horizontal portion ing a transparentperipheral portion, a source 0 ot' the curtain, forms a horizontal teed-table ot light within the drum, a roller journaled in on which to place the tracings and print-pzwer iixed relation to the drum, a curtain attached when feeding the machine. to said roller and to the drum, means for windlhe drum can be held against backward roing the curtain on the roller, and a roller tation by the pull of the curtain, by a ratchet which presses the curtain against the periph- 95 and pawl Jig. 1, or by any other device. cry of the drum, substantially as set forth.

in operation the tracings and print-paper 'lhecoml)ination ot' ahorizontal rotatable are placed in proper relation on the horizondrum having atransparentperipheral portion, tal teed-table and the drum 8 rotated 'lor- 1 asourceotlight within thedrum, a horizontal 40 wardly. As the drum and curtain (1 move in teed-board, a roller journaled adjacent tosaid 10 the same direction the tracings and printteed-board,andacurtainattachedtosaid roller paper will be gripped and carried in between and extending in asubstantially horizontal dithe drum and curtain and tirmly held by the 1 rection toward and attached to the drum, sublatt against thedrum. A single large tracstantially as set forth.

ing and printer several small ones can be t'ed 6. l,hecombination olahorizontalrotatable I05 into the machine to rest on each glass plate ol 1 drum havingatransparent peripheral portion, the drum. Yl'hen the drum is charged, the i a source of lightwithin the drum, ahorizontal lamps F are lighted and the drum allowed to I roller journaled in lixed relation in lrontol' the stand stationary until the printing is etlected, i drum, a curtain attached to said roller and exalter-which the pawl is tripped and drum i tending inasubstantiallyhorizontal direction H0 turned in the reverse direction or bacl \vardl The curtain-roller ll rewiuds the curtain H thereon, and the tracings and prints are discharged onto the teed-table.

ts the leetttable. curtain, and drum are horizontal, the machine can be readily charged with a number ol small tracings and printol them beingdisplaced, and thus spoiled. lhe

machine is theret'ore .much easier to operate toward and attached to the drum, and a roller t'or holding the curtain against the periphery ot' the drum, substantially as set l'orth.

\Vitness my hand this Tth day 01 l,)ecem|n r, liltlt.

TILL/X hi) 'I. M EA 1 \l'itnesses:

tlnantns \V. PARKER, Enwam) U. Haul).

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