US1831248A - Photographic printing machine - Google Patents

Description

Nov. 10, 1931. s, o ms 1,831,248

PHOTOGRAPHIC PRINTING MACHINE Original Filed Dec. 10, 1926 6 Sheets-Sheet 1 Fl l- INVENTOR, 2H0 kins, Y B

' ATTORNEYS.

Nov. 10, 1931. R. s. HOPKINS PHOTQGRAPHIC PRINTING MACHINE Original Filed Dec. 10, 1926 6 Sheets-Sheet 2 R0 INVEMTOR,

y 0 BY Nov. 10, 1931. R. s. HOPKINS 1,331,248

. PHOTOGRAPHIC PRINTING MACHINE Original Filed Dec. 10, 1926 6 Sheets-Sheet 3 IN VEN TOR.

NOV. 10, 1931. R s, op s 1,831,248

' PHOTOGRAPHIC PRINTING MACHINE Original Filed Dec. 10, 1926 6 Sheets-Sheet 4 Fl? E- INVENTOR,

4 S. HOULS,

Nov. 10, 1931- R. s. HOPKINS PHOTOGRAPHIC PRINTING MACHINE 6 Sheets-Sheet 5 Original Filed Dec. 10. 1925 WVVENTO 5H0 plains,

TTORNEYS NOV. 10, 1931. v R. s; HOPKINS 1,831,248

PHOTOGRAPHIC PRINTING MACHINE Original Filed Dec. 10, 1926 6 Sheets-Sheet 6 MXMS;

Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE BOY S. HOPKINS, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK PHOTOGRAPHIG PRINTING MACHINE Application filed December 10, 1926, Serial No. 153,882. Renewed May 2, 1981.

This invention relates to photography and more particularl to photographic printing machines. One j ect is to provide a machine in which a platen is operated by atoggle. An-

other object is to provide a suitable resilient toggle mount. Another object is to provide a two art platen, one section being adjustable relative to the other. Another object is to provide a platen in which good contact may be obtained with but little effort. Another object is to provide a suitable translucent platen, the translucent sections of which are carried by interengaging frames. Another object is to provide suitable means for varying the pressure required to o erate the platen. Another object is to-provi e a clamp cooperating with the toggle and ada ted to clamp a negative, mask or the like. till another object is to provide a toggle for movea ing a two part platen through a pivotal connection therewith, said mechanism having additional contacts for moving one part of the laten relative to the other, and still other obects will app-ear from the following specification, the novel features being particular ly pointed out in the claims at the end thereof.

Coming now to the drawings wherein like reference characters denote like parts throughout:

Fig. 1 is apart section and part side elevation of a printing machine constructed in accordance-with and embodyin a preferred form of my invention; parts being omitted for clearness;

Fig. 2 is an enlarged fragmentary detail partly in section of the platen, platen operating mechanism, and clamping dev1ce;

Fig. 3 is a perspective showing a portion of the platen and platen operating mechanism;

Fig. 4'is an enlarged side elevation of a portion of the printingmachine shown in Fi 1' Fig. 5 is a plan view of the printing machine shown in Fig. 1, portions of the platen operating mechanism being omitted for the sake of .clearness;

Fig. 6 is a erspective view of the clamp and pa er gui e;

Fig.2 is a front plan view of the printer shown in Fig. 1; K

8 is hinged at 10 to'the front member 11 of a frame 12 which is spaced beneath the top of the printer, and which carries a slideway 13 for a screen 14.

The top of the printer is provided with a printing panel 15 which is preferabl of sheet glass over the top of which is movab y mounted a platen 16. This pla en may be moved by a toggle consisting of links 17 and 18, the latter link being extended at 19 to form a bell crank lever and having a handle 20 by which the platen may be moved.

The construction of the platen and platen moving mechanism is best shown in Figs. 2 to 5 inclusive. From Fig. 5 it will appear that the platen 16 consists of two frames 21 and 22, the former having four sides and the latter three sides. Frame 21 is provided with offset arms 23 which carry bearings 24 through which shafts 25 pass. These shafts are movable in bearings 26 of the frame 22, and thus form a hinge connecting the two platen sections. Each frame 21 and 22 is covered with light transmitting pyroxylin covers 21' and 22' through which the printing operation may be viewed if desired. Any other H ht transmitting material may be used, but I h nd that orange or red sheet p roxylin is satisfactory, and in the form s own in Fig. 3 I have used two sheets to obtain the desired thickness.

The rearplaten frame 22 is provided with bearings 27 through which a shaft 28 passes, this shaft being carried b links 29 which are hinged at 30 to the brac ets 31.

It should be noted that shaft 30 lies beneath the level of the table top 1, because with the,

laten sections arranged at an intermediate evel between the toggle 16 and the pivot 30, there is no tendency for platen section 22 to ride up and make poor contact when section 21 is pressed down by): two point contact with the toggle as will hereinafter fully described. 11 other words, the toggle thrust is forward (toward an operator) as well as downward, and as )ivot 30 is located beneath the faces of the p aten such forward force draws the platen downward.

Coil springs 32 encircle shaft 28, one end 33 of the springs being held beneath screws 34 on brackets 29 and the other end 35 being affixed to a sleeve 36 which may be turned and fastened on shaft 28 by means of a set screw 37-. In-this wa the tension'on springs 32 may be adjuste so that they will counterbalance the weight of the platen which is at tached to shaft 28 by means of pins 38 passing through bearings 27.

. The offset side arms 23 of frame 21 are provided with bearin s 39 through which the shaft 40 passes. t best shown in Fig. 4, shaft 40 pivotally connects link 18 of the toggle to the outer platen section. Link 17 of the toggle is ivoted at 41 to a lever 42 carried by a sha 43supported, in a bracket 31. This lever is. extended at 44 and is pressed by the spring 45 toward the back 46 of the bracket. A set screw 47 limits the movement of the lever members and is supported on a stud 48 fitting into a tra ped hole 49 in the bracket. Screw 47 may e turned to adjust the tension on s ring 45.

The resilient support 0 toggle links 17 and 18 provides the force necessary to latch the platen in a closed position in the following manner: The toggle links 17 and 18 are pivoted to ether at 50 and link 18 is provided with a ifurcated end 51 which permits the links to fold. When the handle 20 is moved to lower the platen and the toggle approaches a straight line, spring 45 is placed under tension so that pivot 50 slightly passes a dead center. The force of spring 45 will retain the tog le links in this position as the movement 0? these links cannot pass further than the position shown in Fig. 4 because pad 52 on arm 19 strikes pad 53 which forms a part of the platen section frame. Pad 52 is preferably of some shock absorbing material such as rubber or leather.

It should be noted that the two platen section frames are hinged together by the stub shafts 24. If, because of manufacturing variations, the faces 21' and 22 of the two latens do not align up properly these may Be adjusted relative to each other by means of set screws 54 passing through lugs 55 contacting with ends 56 of frame member 22. (Figs. 4 and 5.)

As best shown in Fi 3, a spring 57 connects the lower part 0 toggle link 18 with the rear part 58 of platen section 22. This spring assists in movingithe rear platen section into contact with t e printing panel in advance of the front panel section, as shown in Fig. 2. The position of the pivotal pins 40, 41, and 50 is such that when the parts are"- in an inoperative sition, as shown in full lines Fig. 2, the p aten sections are in substantial alignment and the pads 52 and'53 are in contact. This is useful because as the handle is pulled to lower the platen the initial starting movement is through pads 52 and 53. Still more important, however, is that the two point contact between the toggle and platen, that is, pivot 40 and pads 52, 53, durmg the start of the downward movement section 21 of the platen is made to move through a path about }pivot 28 similar to the path through whie toggle arm extension 19 passes. During this movement, section 22 turns on pivots 24 so as to reach the printing panelfirst. After section 22 turns on pivots 24, the two point contact between the tog 1e and platen section 21 is also broken, and't is contact is not again made until the platen is lowered almost to the panel.

As the handle is moved downwardly, the arts assume the position shown in broken ines as the paper is clamped on the printin panel, and when the platen is fully lowere the pads 52, 53 are again in contact, as above described. Thus there is a means in addition to the connection between the tog le and platen at 40 for starting the downwar platen movement and for pressing the platen against the printing anel 15. r

In order to old a negative or mask in position on the platen, and in order to form a guide for placing paper, there is an L-shaped clampin member 58. Referring to Figs. 5 and 6, t is clamping member is preferably faced with soft material such as felt or rubber 59 and arm 60 may be made relatively short. Two bolts 61 are carried by the ends of the masking member, these bolts passing through apertures in the lu 62 which are preferably integral with inks 29. Coil springs 63 encircle the boltsand nuts 64 are for adjusting the distance of the clamping member from the links 29.

The clamping member 58, as shown in Fi 2 and ,5, normally remains in contact with t e top 1 of the printing machine. The platen normally turns about shaft 28 so that a clamp 58 will remain in contact with the table when the platen reaches its normal open position. In order to move the clamp for inserting or removing the negative, mask, or the like the handle as shown in Fig. 2, should be moved further back than its normal open position. This causes links 29 to turn upon shaft 30, thus raising the clamping member. By releasing handle 20 the clamp will be moved back against the table and the platen will remain in its normal open position, as shown in dotted and dashed lines, Fig.2. Links-29 have the additional function of permitting the platen sections to adjust themselves for various different thicknesses of negatives, masks and different papers.

menace As shown in Figures 1 and7 a slidable hinge 68 by moving the brace 69, and so fold it down out of the way when not'in' use.

As shown in Fi 4, a second vignetting screen 70, preferably of ground glass, is carried by a frame 71,'which is affixed to a shaft 72 supported by a pair of bell crank levers 73.

. These levers are pivoted at 74to 'a pair of parallel links which in turn are pivoted at 76 to the printing machine. A. spring 77 is used to counterbalance the screen so that it may remain in any set position. A handle 78 (Big. 7) extends out through an arcuate slot 79 in the side of the printer and permits the screen to be moved up and down by the parallel links 75 and also to be swung from an operative osition to that shown in dot and dash lines, 1g.- 4.

A separate application, Serial Number 153,881, filed December 10, 1926, covers the vignettin apparatus described in the two paragrap s above.

The lighting system employs a point light source such as is described in m copending application Serial No. 129,230, led August 14, 1926 for photographic printer. In the present printer the housing 3 is divided into two compartments 79 and 80, see Fig. 1. Compartment 80 is separated from 79 by means of a wall 81 which has a door 82 mounted to slide in slot 83 by means of a handle 84. This gives access to the printing lamp 85 which is preferably of a high powered concentrated filament type, such as a 500 or 1000 w. Mazda. The lam 85 is mounted on a base 86 which may be adjustable in two directions for properly focusing the lamp, and which may be fastened in a desired position by a wing nut 87. I prefer to use a reflector 88 which is preferably movable on arm 89 hinged to a bracket 90 and pressed by spring 91 into position shown in full lines.

The partition 81 is provided with a pair of windows 92 and 93, the former for passing a restricted light beam from lamp 85,- and the latter for passing an'unrestricted light beam 94 which is mounted upon a suitable bracket 95. Lamp 94.- is the pilot lamp and is preferably orange or some other nonactinic color, although, if desired, a low powered uncolored lamp may be used.

Lamps 85 and 94 are optically spaced the same distancefrom the printing panel 15,

thus the light rays passing through the windows 92 and 93' from each of the lamps to the platen are of the same length and through the greater part of the distance traverse the same co'urse.- On top of the partition 81 there is a bracket 96 adapted to support a reflector .which is (preferably a mirror 97 This mirror is hinge at 98 to the partition and is provided with an arm 99 by which it ma be oscillated upon its hinge through the r0 100 connected to bell crank lever 1'01 pivoted at 30 to the bracket 31. The bell crank lever is also connected by means of achain 102 to the joint 51 of the tog le.

As shown in Fig. 8, t e mirror is normally closed by means of a spring 104 encircling the hinge 98. When the platen, however, is lowered by means of a handle 20, Fig. 1, a chain 102 turns the bell crank lever 101 about its pivot thereby pulling u the rod 100 and movin the reflector 97 to t e position shown in das ed lines, Fig. 8, in which the light rays from the printing lamp 85 are bent and reflected toward the printing panel. It will be noted in Fig. 8 a reflector behind lanip 85 has been omitted, and window 92a is smaller than Window 92. This, of course, reduces the light, but is satisfactory. I prefer to.

include the reflector.

I prefer to provide a switch, such as shown at 105 in Figs. 8 and 9 which will make and break the circuit oing to lam 85, since this materially exten s the life 0 the printing lamp. Each time the arm 100 is moved to its dashed line position, Fig. 8, shaft 98 moves a lever 106 which swings a mercury switch 105 about a pivot 107 to make the circuit. Obviousliy any desired type of switch may be employe As shown in Fig. 9 the wiring of my machine is simple. Printing lamp 85 is com nected by wires 108 and 109, the latter passing through switch 105 and the rheostat 110 to the mam wires 111 and 112, lam 9; may be connected to burn continuously, when switch 113 which controls the circuit is closed as shown.

As shown in Figs. 1 and 5, I provide a rheostat 110 which may be mounted between the brackets 31 and which may comprise a series of resistance points 114 mounted on a plate 115, there being a spring contact 116 controlled by handle 117 pivoted at 118 to a suitable shaft and controlled by a handle 119. I find it convenient to provide a scale 120 so th n; any lamp setting may be repeated at W1 If, for any reason, the operator desires to turn on the printing lamp 85 while the platen 16 is raised, a handle 119 of lever 121 (Fig. 4) may be moved from full to dashed line posiit the arm 123. This arm carries a cam 124 which moves bell crank lever 101 to a position in which the rays of lamp 85 are re-;

tion. This causes shaft 122 to turn and with raising the clamp 58. If part of the negative prints too readily, vignetting material may be laid upon the screen 14 or the screen 7 according to the results desired, as fully described in my copending application Serial the extent and result of the vignette.

No. 153,881, filed Sept. 10, 1926. The operator looking down upon the platen may observe the effect of the vignetting material by means of the light rays coming from the pilot lamp 94; Since the pilot and printin lamps are opti cally spaced similarly with respect to the platen the operator may accurately change The platen may be then lowered by handle 20 and section 22 will contact with the paper P in advance of section 21, and thus hold it in a desired position. passes a dead center (which is after the platen is fully lowered) it pulls chain 102 and, through the mechanism above described, mirror 97 to the position shown in Fig. 1 and makes the circuit of lamp 85. The light rays from the printing lamp will then be reflected by mirror 97 through the same path as the light rays going from the pilot lamp 94. The rheostat 110 may be used to vary the intensity of the printing lamp so that an exposure of a useful duration for the particular work may be employed.

For instance, if it is desirable to hold back a portion of the negative during the printing operation, the door S'may be open J and the operators hand or a card may be moved in the path of the light rays passing to the printing panel. During this operation an operatormay look through the platen 16 since the platen faces 21 and 22 are transparent. The color of these platen faces is such that the printing light will not blind the operator.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a photographic printing machine, the combination with a printing panel, of a two part platen having panel contacting faces mounted to move thereover, a hinge connection between 'the two platen sections, one platen section overlapping the other, and

means on one platen section adapted to co section for-adfaces whereby operate with the other platen justing the two contacting they may be made to lie substantially in the same plane.

2. In a photographic printing machine, the combination with a printing panel, of a two part platen having panel contacting faces mounted to move thereover, a hinge connection' between the two platen sections, one platen section overlapping the other, and means on an overhanging portion of the platen for adjusting the relative position to As the toggle pivot 51' part platen having panel contacting faces mounted to move thereover, a. hinge connection between the two platen sections, one platen section overlapping the other, and a set screw carried by a portion of the overhanging platen section adapted to impinge upon the other platen section whereby the relative position of one panel contacting face may be altered with respect to the other.

4. In a photographic printing machine, the combination with a printing panel, of a two part platen mounted to move thereover, said platen including two frames of substantially similar proportions, arms on one frame extending to each side of and being pivotally attached to the otherframe, portions of one frame overhanging portions of the other frame, and means extending between the overhanging frame and the frame lying beneath the overhanging frame for adjusting one frame relative to the other.

5. In a photographic printing machine, the combination with a printing panel of a two art platen mounted to move thereover, said platen including two frames of substantially similar proportions, arms on one frame extending to each side of and being pivotally attached to the other frame, portions of one frame overhanging portions of the other frame, and set screws passing through the overhanging frame adapted to impinge upon the other frame whereby the relation between the two frames may be adjusted.-

6. In a photographic printing machine, the combination with a printing panel of a two part platen hinged to move thereover, said two part platen including a pair of frames, one frame including a rectangular frame member having four edges, the other frame member having three edges, both frames supporting transparent panel contacting faces, the fourth edge member of one frame contacting with the transparent face of the other platen member forming a fourth side to the frame therefor when the platen is in an operative position upon the printing panel.

7. In a photographic printing machine, the combination with a printing panel of a two part platen hinged to move thereover, said two part platen including a pair of frames, one frame including a rectangular frame member having four edges, the other frame member having three edges, both frames supporting transparent panel contacting faces, the fourth edge member of one frame contacting with the transparent faceing the frames relative to each other, whereby the fourth side member of one frame may be adjusted to contact with the unsupported edge of the transparent face of the platen section supported by the three sided frame member.

8. In a photographic printing machine, the combination with a panel, of a platen movably mounted to move to and from the panel, a toggle for movin the platen, a pivotal connectlon between t e platen and one end of the toggle and a mount for the other end of the toggle including a pivoted lever and a support, and a spring pressing a portion of the lever toward the support.

9. In a photographic printing machine, the combination with a panel, of a platen movably mounted to move to and from the panel,

.a toggle for moving the platen, and a mount for the toggle including a pivoted lever and a support, a stud carried by the support, and a spring encircling the stud and adapted to press a portion of the lever toward the suport. P 10. In a photographic printing machine, the combination with a panel, of a platen movably mounted to move to and from the panel, a toggle for moving the platen, and a mount for the toggle including a pivoted lever and a support, a threaded stud carried by the support, and a spring encircling the stud and adapted to press a portion of the lever toward the support, the spring tension being adjustable by turning the threaded stud.

11. In a photographic printing machine,

' the combination with a panel, of a platen movably mounted to move to and from the panel, a toggle for moving the platen, a pivotal connection between one end of the toggle and the platen, and a mount for the other end of the toggle including a pivoted lever and a support, means for resiliently pressing a portion of the lever toward the support, and

- means for limiting the movement of the lever towards the support.

12. In a photographic printing machine, the combination with a panel, of a platen movably mounted to move to and fromthe panel, a toggle for moving the platen, connections between the platen and one end of the toggle, and a mount for the other end of the toggle including a pivoted lever and-a supand a stud carried thereby extending through the opening-in the lever, and a. sprmg encircling the stud, adapted to move the lever with respect to the support.

15. In a photographic printing machine, the combination with a panel, of a platen movably mounted to move to and from the panel, a toggle for moving the platen, and a mount for the toggle including a pivoted lever having an opening therein, a support, and a stud carried thereby extending through the opening in the lever, a spring co-operating with the stud to create a spring tension tending to move the lever with respect to the support, and means for limiting such movement.

16. In a photographic printing machine, the combination with a printing panel, of a platen movable to cover and uncover the panel, a toggle having one end pivotally attached to the platen, a support, and a resilient connection between the support and the other end of the toggle.

17. In a photographic printing machine, the combination with a printing panel, of a platen movable to cover and uncover "the panel, a toggle having one end pivotally attached to the platen, a support, and a resilient connection between the support and the other end of the toggle including a resiliently mounted toggle carrying lever.

18. In a photographic printing machine, the combination with a printing panel, of a platen movable to cover and uncover the panel, a toggle pivotally attached to the platen, a support, a resilient toggle carrier mounted on the support, a ivotal connection between the support and t eresilient toggle carrier. 19. In a photographic printing machine, the combination with a printing panel,of a platen movable to cover and uncover the panel, a toggle pivotally attached "to the platen, a support, and means for permitting limited movement of the toggle with respect to the support comprising a resiliently mounted member pivoted to the toggle and to the support.

20. In a. photographic printing machine, the combination with a printing panel, of a platen movably mounted with respect there to, a pivotal support for the platen, including a a link, a pivotal support for the link, and a clamp mounted on the link and adapted 3x: be operated thereby.

21. In a photographic printing in? i the combination with a printing panel, of

a platen movably mounted with respect the to, pivotal support for the platen including a link, a pivotal support for the link, and a clamp carried by the link, a resilient member associated with the l nk and clamp tending to separate the parts.

22. In a photographic printing machine, the combination with a printing panel, of a platen movably mounted with respect thereto, a pivotal support for the platen, including a link, a pivotal supportfor the link, and a clamp carried by the link, a resilient member associated with the link and clamp tend-- ing to separate the parts, and means for limiting the possible movement of the clamp from the link under the impulse oi the re silient member.

23. In a photographic printing machine, the combination with a printing panel, o." :1 platen movably mounted with respect thereto. a pivotal support for the platen including a link, a pivotal support for the link, means for moving the platen about its pivotal sup port to and from the platen without moving said link, said means being also capable of further movement when the pie n is moved from the panel to move the link.

24. In a. photographic printing machine, the combination with a printing panel, of a platen movablymountcd with respect thereto, a pivotal support for the platen. including a link, a pivotal support for the link. means for movin the platen about its pivotal support to and from the panel without moving said link, said means being also capable of further movement when the platen is moved from the panel to move the link, a clamp car-- ried by the link, said clamp being normally in an operative position in which sheet material may be held against the printing panel. but moved from clamping position by moving the link.

25. In a nhotogra hic prir inc machine, the comb-i i with a printing panel of a pin on mova v mounted with respect there )port for the platen ll lCllllu" to, a pivotal 5; a link, a. pivotal support for the link. means for moving the platen about its pivotal port to and from the panel withon' ,i said link, said means being capable of further movement when the platen is moved from the panel to move the li a clnnnii carried bv the link, means for resi tlv moving' the clamp from the hill and men? ior limitmg such movement, said clamp l'ieing rendered inoperative by movnn g said link.

26. In a photographic printing machine, the combination with a printing panel. of :1 platen movably mounted with respect there to. a pivotal support for the platen including a link, a pivotal support "for the link, n'ieans for moving the platen about its pivotal support to and from the panel without moving said link. said means being also capable of further movement when the platen is moved cu: in p rection including the link.

27. In a photographic printing machine, the combination with a printing panel, of a platen movably mounted with respect there to, a hinged support for the platen comprising a link pivotally attached to the printing machine and to the platen, and :2 r uping member supported by said lixrh and normally contacting with the printing nurchine.

28. In a photographic printing machine, the combination with a printing panel, of a platen mounted to move thereover, a hinged suppoit for the platen including a link pivotall y attached to the platen and to the printing: nuuibine frame, and means including a spring tending to turn the platen about the pivot by which it is connected to the link. whereby the platen may be raised without raising the link.

29. In a photographic printing machine, the combination of a printing panel, of a platen mounted to move thereover, a hinged support for the platen including a. link upon which the platen is pivotally mounted, a support upon which the link is pivotally mounted. and a spring encircling the pivotal connection between the platen and link one end of said spring being anchored to the link, and the other end of the spring being anchored to the platen, said spring increasing in tension when the platen is swung about its pivot to ward the printing panel, and decreasing in tension when the platen is raised from the printing panel.

30. In a photographic printing machine, the combination of a printing panel, of a platen mounted to move thereovcr, said platen including a pair of relatively movable members each having a paper contacting face, a. toggle pivoted to the platen, a, support on which the other end of the toggle is mount-- ed, on extension on one toggle arm, an opereting handle carried thereby, said extension on the toggle arm having contact with a platen section when the platen is pressed against the panel.

31. In a photographic printing machine. the combination of a printing panel, of a platen mounted to move thereover, said platen. including a pair of relatively movable members each having P1 paper contacting face, a toggle pivoted to the platen, a support on which the other end of the toggle is mounted, an extension on one toggle arm, an oneratine handle carried thereby, said extension on the toggle arm having a platen contacting member, a contact pad on a platen section, the member and pad being brought into engagement by lowering the platen upon the printing panel.

32. In a photographic printing machine, the combination of a printing panel, of a platen mounted to move thereover, said platen includirg a, pair of relatively movable members each ha Vll'lff a paper contacting taco, a. toggle piv ted to the platen. a support on which the other end of the toggle is mounted an extension on one toggle arm, an operating handle carried thereby, said extension on the toggle arm including a pad positioned so that said pad will engage a platen section, when said platen is in engagement with the panel, and when said platen is fully raised from said printing panel.

33. In a photographic printing machine, the combination of a printing panel, of a platen mounted to move thereover, said platen including a pair of relatively movable nien'zbersi-iach ha vinga paper contacting face, a toggle pivoted to the platen. a support on which the other end of the toggle is mounted, an extension on one toggle arm. an operating handle carried thereby. said extension on the toggle arm having a platen contacting memher, a contact pad on a platen section, the member and pad being brought into engagement by moving the toggle to a position in which the platen is either open or closed, said pad and the member beings: adapted to separate during movement of the platen between these two positions.

In a photographic printing machine, the combination with a printing panel, of a platen movably mounted thereove-r, a toggle pivoted to and adapted to move the platen, a support to which the toga-1e is pivotally attached and means supplementary to the pivotal connection between the toegle and platen for assisting in parts of the downward movement thereof.

In a photographic printing machine, the combination with a printing panel. of a two part platen movable thereover, and a toggle pivotally connected to the platen for moving the same, a support to which the tog- ,eflc is pivotally attached. a. link pivoted to the platen. and a pivotal support for said link located below the level of the platen, whereby pressure applied t* the platen through the toggle tends to cause a downward movement of the platen about its pivotal support.

36. In a photogra hic printer. the cornhinat on with a printing panel, of a platen movably mounted thereover, a support. and a toggle connected to the support and pivotallv connected to the platen, means for attaching the platen to the support including a link, said link being pivotally mounted beneath the level of the printing panel to the support and being nivotallv attached to the platen. said toggle being adapted to exert a downward and outward force from the support upon the platen, said force causing the pivoted end of the platen to be drawn downwardly against the panel.

37. In a photographic printer, the combination with a printing panel, of a platen movable thereover, a support, and a toggle connected to the support and pivotally connected to the platen, a pivotal support for the. platen including a link, hinged to the platen and pivoted to the support beneath the level of the panel, a spring tending to turn the platen about the hinge, the toggle being adapted to exert a downward and outward thrust from the support upon the platen, whereby the platen is firmly pressed upon the panel.

38. In a printing machine, the combination with a'panel, of a platen movable thereover, a support. a toggle pivotally connected to the support and pivotally connected to the platen, a link, connections between the link and the platen including a pivot, said link being pivotally attached to the support, said last mentioned pivot being located beneath the level of the printing panel, whereby the platen is supported between the two pivotal con nections therewith, said toggle being adapted to press the platen downwardly and outwardly from the support into contact with the panel.

Signed at Rochester, New York, this 6th day of December, 1926.

ROY S. HOPKINS.

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