Dec. 31, 1946. 2,413,664 w. c. TOLAND PRINTING PLATE MEANS Filed July 22, 1942 '4 l5 ll‘ "'9 ' 1/ ,2 ' )0 / . 121113211503‘. l’atented Dec. 31, . smo- STATES2,413,664I PRINTING PLATE omens William Craig Toland, Broohline, Mass, assignor > - 'to William Craig Toland, trustee ' Application July 22, 1e42, Serial No. assets 3 Claims. toilet-areas) 1 2 5 are strips l of adhesive material, such as for This invention relates to'printing and more es-‘ example Scotch tape. pecially to planog'raphic printing plate means. Surfaces 5% oi the marginal portions 3 are An object of the invention'is to improveplano- . roughened to provide a lithographic grain cor- . graphic printing plates and to devise a composite printing plate member‘ in which metal and other responding to usual grained surfaces of litho- ‘ graphic printing plates. The grained surfaces t materials are combined with‘ a view to forming are adapted to being etched and treated with a non-stretch ?exible printing plate, whichis‘ aqueous mixtures, thereby to form water~recep cheap, easy to handle and sufficiently durable to tivegrease-repellent, ricneprlnting portions of a withstand clamping on a lithographic printing ‘ ' . press. Another object is to provide a printing Hi planographic printing plate. Mounted in the opening 2 in abutting relation I plate holder in which colloid. plates and other , with respect to inner edges of the marginal por typeset paper or plastic plates may be detach tions 3 is a paper printing element t, which is abiy supported. The invention also aimsto pro preferably of a thickness corresponding to the ‘ vide improved means of securing paper printing depth of the opening 2 so that the surface of the plates to a printing member. ' printing plate element @ lies in the same general The nature of the invention will be more fully plane with respect to the grained surface or‘ the understood from the following description of the > support 5. The ‘strips ‘E securely hold the ele drawing and discussion relating thereto. ' in the accompanying drawing: . ment @ in the base of the support 9, while per , mitting it to be lifted away when so desired. As illustrative of actual dimensions, we may Figure l is a plan view illustrating a plano= graphic printing plate support of the invention; . Fig. 2 is a cross section taken on the line 2—2 provide a support of zinc or aluminum having a thickness of .015 inch, with the opening 2 having of Fig. l and further illustrating a printing plate element mounted in the support; and a depth of .006 inch, and with the printing ele- > ' Fig. 3 is an enlarged fragmentary cross sec; tional View of a modification of the invention. The invention generally includes a frame or ment 6 having a similar thickness of .006 inch. The printing‘ plate element '8 is preferably formed of paper, plastic or other materials, and the thickness of the plate, in which is detach- . non-printing portions 9. includes printing portions 8 and nonaprinting support constructed of a relatively iiexibleand portions 9. The non-printing portions 9 of the durable material such as sheet metal, which is adapted to be secured to a lithographic printing 30 printing plate element .8 are arranged to occur in abutting relation‘ with respect to the grained press by clamping means commonly employed for non-printing surfaces 5i oi the support it so that ‘ this purpose. The frame or support is formed the grained surfaces ii are a continuation of the with an opening extending throughout a part of ' As a result of this arrangement there is pro ably supported a paper or plastic printing plate. The surface of the paper or plastic printing plate vided a composite planographic printing surface, in which the grained metal surface of the support cooperates with the non-printing portions of the frame, which is grained to constitute non-print printing element to maintain water-receptive ing portions adapted to constitute a continuation ink-repelling character at all points except where of non-printing areas of the paper or plastic 40 printing portions of the printing element 6 occur printing plate. inside of its marginal edges, Referring more in detail to the drawing, nu occurs ?ush with the surface of the support or meral i denotes a frame or support member which may, for example, comprise a thin sheet of aluminum or zinc of the type commonly em ployed for lithographic printing plates. The sup By this means the line ofabutment of the . printing element with the support is maintained from intersecting any of the printing images of 45 the printing element and no line in printed sub‘ port i is formed with an opening 2 which ex tends throughout a substantial part of theinner - surface of the support vi, to leave'outer marginal portions 3. - ject matter can subsequently appear. The out= line itself does not become transferred since at all points where the margin line occurs both the support and the plate element are water-recep In a preferred embodiment of the invention, 50 tive and hence will repel ink. _ A number of advantages are derived from the composite printing structure'relating to the use of paper and plastic materials for the printing end thereof, is extended to form grooves 5 of , ‘element 6. In using paper or plastic printing slightly increased depth. Located in the grooves 65 plates, it is customary to clamp such _ plates the opening 2 extends throughout a part only of the thickness of the support I, as is better shown in Fig. 2 of the drawing. The opening 2, at either 2,418,664 , 4 , ‘ tightly to a roll and this subjects them to composed of paper having lithographic coatings stresses which may, in some circumstances, tend which may be treated to render them'suitable for lithographic printing. Various other means of fastening the printing element in the support may be desired to be employed. For example, the edges of the printing element may be beveled ‘to ?t‘ with correspondingly beveled edges in a ‘ to cause the plates to crack. Such plates may ‘' also be subject to stretching and shrinking when exposed'to water as it is employed in. lithographic Printing. . It will be seen that possible cracking of the paper plates from being clamped on a roll is sub modi?ed support, and other changes made use stantially reduced or overcome by the composite of. ’ structure. With respect to the clamping, it is 10' While we have shown a preferred embodiment pointed out that the marginal edges of the metal of our invention, it should be understood that support are available for clamping in the man ner common to all metal lithographic plates. various changes and modi?cations may be re The paper plate is directly secured by the adhe sive strips which are especially effective due to 15 the recessed arrangement of the paper, plate in , the support whereby edges of the paper are snug sorted to, in‘ keeping with the spirit of the in vention as de?ned by the appended claims. We claim: 1. A planographic printing plate‘ comprising in combination; a thin, ?exible, support member ly ?tted against the edges of the plate. With presenting marginal surface portions adapted to respect to stretching or shrinking, it should be constitute non-printing portions, said surfaces observed that by con?ning the paper plate in the 20 surrounding an opening in spaced relation to opening 2 of the support, with the edges of the the outer edges of the support member, an in . plate in abutting relation to the edges of the sert planographic printing plate secured. within opening 2, there is less opportunity for the paper the said opening and substantially ?lling the same to become extended. At the same time by at with its edges lying in abutting relation to the teaching‘ the plate element to the support by 25 walls of the opening, said support member pro means of adhesive strips, i, or by adhesive placed viding substantial clamping edges for securing over the entire under surface of the plate ele the said planographic printing plate to a print ment, this member is further prevented from ing cylinder. shrinking. - - ' The use of the frame or support 5 eliminates 30 handling of plates in many instances since the support may be clamped on a lithographic print .ing roll or other type of printing member, and locked in a correct position to carry out a print irig operation. Thereafter paper printing plate elements may be inserted and removed from time to time as required, with considerable sav ing of time and labor. It is also pointed out that the use of the frame or support 5 is particu larly adapted to small sized plates which are not of themselves adapted to be clamped on print- ing machines. ‘Various other advantages are present also, such .as savings in development 1a bor, reduction in the amount of developing mate. rial used, and the like. I The support I may be formed in various ways 2. An article of the character described com prising; a thin, ?exible, metal planographic plate support, said support being formed with a recess in the plate support surface in spaced relation . to the outer edges thereof, said recess ‘being de ?ned by retaining edges, a planographic print 35 ing plate element mounted in the said opening ‘with its edges lying in abutting relation with respect to the said retaining edges, said sup ‘v port presenting a marginal portion which is adapted to provide non-printing portions lying in 40 the same plane with the non-printing portions of ‘ the said printing plate element, said marginal portion being further adapted to provide clamp ing edges for securing the support and plate around the drum of a printing cylinder, thereby 45 to substantially remove tension from the print as by forming the opening 2 with a, die, or cut ting the opening out, or casting a metal sheet lng element and to cooperate with the said re taining edges of the opening in maintaining dimensional stability in the said printing ele having this general formation. It may be de sired to modify the construction of the support, 50 3. An article of the character described com as for exampleby using two supporting plates, prising; a thin, ?exible, sheet-metal support, one of which is formed with an opening land said support having marginal ‘grained surface one of which is not. Still further, it may be portions ‘adapted to function as non-printing por desired to provide a support in which the open tions of a planographic printing plate, said sup ing is cut all the way therethrough, or the open 55 port having an opening formed therein which ing may be desired to be directly incorporated in extends throughout a part only of the thickness a printing roll or platen in a, lithographic print ment. ing machine. - ' » ‘ of the support,‘ a planographic printing plate element formed of paper and resinous materials The printing plate element may also be de sired to be employed with a printing element such 60 secured in‘ the said opening, said plate element being normally resistant to water, means for se as illustrated in Fig. ,3 in which ‘a plate I0 is curing the planographic printing element within made up of layers of paper It and resin material the opening, said plate element presenting print ing portions and non-printing portions, said non ing it adapted to form non-printing surfaces l4, and on which may be formed printing por-_ 65 printing. portions being supported in the plane of the grained surface of the said support, and tions ii. In connection with the modi?cation of said grained surface providing a clamping mar Fig. 3, it is intended‘that the coating l3 will pref gin for securing the support and plate element erably be formed -'of polyvinyl alcohol and clay, around a printing cylinder without substantial although other colloid materials such as gelatin, glue' and others may be desired to be employed. 70 pull being exerted on the edges of the‘ plate element. Still other, types of printing elements may, be ‘l2,'over which is applied a water-receptive coat- _ utilized such as printing elements composed en tirely of plastic materials, or printing elements WILLIAM CRAIG TOLAND.