US2172144A

US2172144A - Printing plate for rotary rib equipped printing cylinders

Info

Publication number: US2172144A
Application number: US227656A
Authority: US
Inventors: Oakes Gradie
Original assignee: PROCESS RUBBER PLATE Co
Current assignee: PROCESS RUBBER PLATE Co
Priority date: 1938-08-31
Filing date: 1938-08-31
Publication date: 1939-09-05
Anticipated expiration: 1956-09-05

Description

Sept. 5, 1939. I G OAKES 2,172,144

P INTING F R RIB EQUIPPED PRINTING CYLINDERS Filed Aug. 31, 1938 Patented Sept. 5, 1939 PATENT OFFICE PRINTING PLATE FOR ROTARY RIB EQUIPPED PRINTING CYLINDERS I Gradie Oakes, Chicago, Ill., assignor to Process Rubber Plate Company, Chicago, Ill., a coioray tion 'of Illinois Application August 31, 1938, Serial Nth-227,656

3 Claims.

The present invention relates 4generally to printing plates for use in connection with Multigraphs and Ihre printing apparatus. More Cparticularly the invention relates to that type of printing plate which comprises1 a type sheet of molded rubber andY a thin metallic substantially conterminous backing sheet together With a layer of cement or adhesive material between the two sheets for securing them together, and is adaptlu edto be applied to aA rotary Multigraph cylinder `having on the o er periphery thereof a series of laterally space longitudinally extending plate supporting and anchoring ribs with integral nlarged heads which project in opposite directions l5 in the direction of the circumference of the cylinder and define undercutgrooves between` the ribs.

One object of the invention is to provide a printing plate of this type which is extremely 20 simple in design and embodies novel and improved means whereby it may be applied and anchored to the Multigraph cylinder more quickly and readily than previously designed plates of the same general character. v

26 Another object of the invention is to provide a printing plate of the type and character under consideration in which the anchoring means therefor is-inthe form of side flanges which are formed integrally with, and extend inwardly O0 from, the side margins of the thinmetal backing i sheet and embody along the outer margins thereof inwardly extending bead formations for hooking or interlocking engagement with the` heads of the ribs which are adjacent to the side mar- U gins of the plate when the latter is applied to the cylinder.

VA further object of the invention is to provide a printing plate of the last mentioned character in which the bead formations are 'continuous and n extend .throughout the entire length of the.an

choring anges and in addition are substantially semcircular in cross-section so thatthe outerY portions thereof extend outwardulya approxi-c mately a 45 angle with respect to the anchoring 45 flanges and serve as the result of their angularity and when pressure is applied to the side margins provide a Multigraphl type printing plate which y is generally an improvement in the art and may I6 be produced at a low and reasonable cost.

(ci. 10i-315) Other Aobjects of the invention andthe various advantages and characteristics of the present f' printing plate will be apparent from a consideration ofV` the following detailed description.

The invention consists in the several novel fea tures which are hereinafter set forth and are more particularly defined by claims at the conclusion hereof.

In the drawing which accompanies and forms a part of this specification or disclosure and in l0 which like numerals of reference denote corresponding parts throughout the several views:

- Figure 1 is perspective view of an externally ribbed rotary Multigrap cylinder having ap. plied thereto a printing plate embodying the l5 invention;

Figure 2 is an enlarged transverse section taken on the line 2-2 of Figure -1 and illustrating in detail the manner in which the anchoring flanges with their inwardly extending bead formations v serve to hold the plate in hooked relation with the heads of the ribs that are adjacent to the side margins of the plate; and

Figure 3 is a fragmentary perspective view of the plate illustrating in detail the construction,

' ,design and character of the anchoring flanges at the slide lmargins thereof. s

The printing plate which is shown in the drawing constitutes the preferred embodiment of the invention. It comprises a type sheet 4 and 30 a backing sheet 5, and is adapted to be applied' choring ribs c. The latter, as shown in Figures 1 and 2 extend from one end edge of the cylinder to the other land embody integral enlarged flat sided heads c1 which project in opposite directions in thedirection of the circumference of the 40 cylinder and define undercut grooves-c2 between the ribs. As well understood in the art, the

. cylinder' C is` adapted to be rotated so as to bring the printing plate into successive engagement/with sheets of paper or the like'for printing 45 purposes.

The type sheet li is formed of molded rubber and embodies .on the outer face thereof integral raised impression or print forming characters 6. The latter are adapted to be inked during rotation of the cylinder C and make the desired impressions whenl brought into contactwith the f worln/A Preferably the type sheet is rectangular.

The backing sheet 5 .is formed of thin metal and underlies the type sheet 4. It is substantialf 5454 ly conterminous with the latter and embodies on the outer face thereof a layer 'l of cement or adhesive material whereby the type sheet is secured thereto. In mounting the printing plate on the cylinder C, the backing sheet 5 together with the type sheet is adapted to be bent into arcuate form.

In order releasably to secure the plate in place two anchor flanges 8 are provided. i These flanges are formed integrally with and extend inwardly at substantially right angles from the side margins of the metallic backing sheet 5. They are adapted to t within the undercut grooves c2 between the ribs c ofthe cylinder C as shown.in`

Figure 2, and embody along the outer parts thereof inwardly extending bead formations 9. These formations are continuous and extend from one end of the anchoring flanges 8 to the other. They are adapted when the plate is applied to the cylinder to underlie vand maintain hooked relation with the heads of the adjacent ribs of the cylinder and serve to hol-d the plate in abutting relation with the underlying face portions 0f the subjacent rib heads c1. The flanges because they are formed integrally with the side margins of the backing plate 5 are capable of being sprung outwardly to a limited extent. The bead formations 9 are semicircular in cross-section with the result that the outer portions thereof extend outwardly at approximately a 45 angle with respect to the inner parts of the flanges 8 and hence when `they are placed against the top faces of the heads and pressure is applied to the side margins of the plate, they urge or direct the anchoring flanges outwardly and cause them to enter the adjoining undercut grooves c2 in such manner that the bead formations snap into gripping or hooked relation with the heads of the adjacent ribs c. The inner parts of the flanges are substantially at and are adapted to fit flatly against the adjoining flatsides of the heads of the adjacent ribs when the plate is in connected relation with the cylinder (see Figure 2). As a result of the fact that the inner parts of the flanges abut flatly against said adjoining side faces of the rib heads when the plate is in place the plate is effectively held or locked against movement circumferentially of the cylinder. When the plate is in place the inner portions of the bead formations 9 underlie the heads of the adjacent ribs c and the outer portions of lsaid formations project outwardly, that is, in spaced relation with respect to the ribs and are in such position that they may be readily engaged by a pry or other tool in connection with the removal of the plate from the cylinder.

'Ihe plate because ofthe anchoring flanges with the bead formations therein is adapted to be ap- .plled to the cylinder in two different ways. In the rst place it may be applied to the cylinder by rst bending or warping it into arcuate form and then placing it in alignment with one edge of the cylinder. After so placing or positioning the plate the ends of the anchoring flanges that are adjacent to the adjoining end edge of the cylinder are inserted into the contiguous ends of the adjoining undercut grooves c2 and the plate is slid axially with respect to the cylinder until it is properly positioned with respect to the cylinder end edges. 'I'he other mode or way of applying the plate to the cylinder comprehends rst inserting one of the anchoring flanges into one of the, undercut grooves c2 and then shifting the plate in the direction of the other anchoring flange in order to bring the bead formation of the one flange into hooked relation with the other flange outwardly in the direction of the entrance of the adjoining undercut groove. In response to further pressure on the plate said other flange is caused to enter the aforesaid groove and the bead formation 9 thereof snaps into hooked relation with the head of the adjacent rib.

The plate may be removed either by sliding it axially or lengthwise with respect to the cylinder in order to disengage the anchoring flanges 8 from the adjacent ribs on the outer periphery of the cylinder or by placing a pry under the outer portionv of the bead formation of one of the anges and then springing outwards the one flange until it c1ears` the head of the adjacent rib of the cylinder.

The herein described printing plate may be manufactured at a low and reasonable cost because of the simple design of the anchoring anges t. Because of the bead formations on the anchoring flanges the plate may be applied to the Multigraph cylinder C in an expeditious manner and with facility and may also be readily emoved by way of a pry or any other suitable ool.

Whereas the bead formations 9 have been described as extending from one end of the anchoring flanges to the other, it is to be understood that they may be of interrupted or series design. It is also to be understood that the invention is not to be restricted to the details set forth, since these may be modied within the scopel of the spirit and scope of theinvention.

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

l. As a new article of manufacture, a printing plate adapted for use with a rotary printing cylinder having on the outer periphery thereof a plurality of laterally spaced longitudinally extending plate supporting ribs with enlarged heads extending in opposite directions circumferentially of the cylinder and defining undercut grooves between the ribs, and comprising a type sheet of flexible and elastic material, a thin backing sheet of flexible resilient metal having the type sheet secured to its outer face-and adapted together withsaid-type sheet to be bent into arcuate form and pressed into abutment with the heads of the ribs, and means for releasably secu/ring the two sheets in place consisting of flanges formed integrally with and projecting inwardly from the side marginsof the backing sheet and having the inner parts thereof substantially flat and extending at substantially right angles to the side margins of said backing sheet and having their outer parts shaped to form bead formations, the inner portions of which extend inwardly and the outer portionsof which extend outwardly at sub- ]stantially degree angles with vrespect to said to ex outwardly beyond said adjacent rib heads, said flangesbeing adapted after outward ilexure thereof and in response to further inward pressure on the side margins of the two sheets to enter the adjacent grooves and then snap inwards towards one another into a position wherein the inner portions of the bead formations underlie and are in hooked relation with the heads of the adjacent ribs and the outer portions of said formations project outwards away from said adjacent ribs.

2. As a new article of manufacture, a printing plate adapted for use with a rotary printing cylinder having on the outer periphery thereof a plurality of laterally spaced longitudinally extending plate supporting ribs with enlarged flat sided heads extending in opposite directions cirthereof andvadapted together with said type sheet to be bent into arcuate form and pressed into inwards to form continuous full length bead formations of substantially semicircularv cross section, the Vouter portions-of said formations ex' tending at substantially degree angles with respect to the inner parts of the flanges and being adapted in response to initial inward pressure on the side margins of the two sheets to slide outwards on the adjacent rib heads and cause the anges to nex outwardly beyond said adjacent ribl heads, the flanges being adapted after out-l ward nexure thereof and in response to further inward pressure on the side margins of the two sheets to enter the adjacent grooves and then snap inwards towards one another into a position wherein the inner partsl thereof nt atly against 'the contiguous side faces of said adjacent rib inder having on the outer periphery thereof a plurality of laterally spaced longitudinally extending plate supporting ribs with enlarged heads extending in opposite directions circumferentially of the cylinder and defining undercut grooves between the ribs, and comprising a type sheet of' flexible and elastic material, a thin backing sheet of readily flexible metal havingjthe type sheet secured to its outer face and adapted together with said type sheet to be bent into'arcuate form for placement against the heads of the ribs, and

means for releasably securing the two sheets in A place consisting of angesconnected to andv projecting inwardly from the side margins ofthe backing sheet and having the inner parts. thereof l n substantially at and extending at substantially vright angles to the side margins of said backing sheet and having their outer partsl shaped to form inwardly extending portions and outwardly extending portions, said flanges being'adapted when the two sheets are placed against the ribs and the side margins of the sheets are pressed inwardly, to enter the adjacent grooves and then snap inwards into a position wherein the inwardly extending portions of the outer parts thereof underlie and are in hookedrelation with the heads of the adjacent ribs and the outwardly extending portions of said outer parts extend said adjacent ribs.

outwardly with respect to l GRADIE OAKES.