US1561174A - Printer's bearer strip - Google Patents

Description

Nov. 1o, 1925. 1,561,174

A J. KYLE PRINTER' s BEARER STRIP Filed July 1e, 1925 Patented Nov. 10, 1925.

UNTTED STATES JOI-IN KYLE, OF PHILADELPHIA, PENNSYLVANIA.

PRINTERS BEARER STRIP.

Application led July 16, 1925.

To all whom t may concern Be it known that I, Jol-IN KYLE, a citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a new and useful Printers Bearer Strip, of which the following is a specification.

My invention relates to a new and useful bearer strip for printing presses, which is adapted to impart a constant and uniform surface speed to the inking rolls of the press as they pass over the form o-r plate, regardless of the amount of type or printing area in said plate or form.

In printing from forms or plates, in which the area covered by the type or printing surfaceis relatively small and scattered over the entire form or plate and particularly in printing individual lines, such as rulings or the like, there has been considerable diiiiculty in inking the form, because the inking rolls received their rotary motion from contact with the printing areas. Thus, if there was a blank space between several detached printing areas, then the printing roll would cease to rotate until it was again engaged by the next succeeding printing area. When thus engaged suddenly, the rolls w1ll scrape 'off considerable ink on to the edges of printing surface or type, before such printing surface sufficiently engages the rolls to revolve them again.

Furthermore, in printing individual lines, and particularly lines extending longitudinally of the direction of travel of the inking rolls over the plate, such lines of printing surfaces soon wear a groove into the relatively soft and plastic surface of the inking rolls, if such printing areas are depended upon, to revolve the rolls.

Various attempts have been made to overcome these difiiculties in printing, that is, in the inking of detached or narrow lines of printing surfaces. One of the means resorted to has been a strip of wood or metal, commonly known as bearer strip, of the same level or height as the printing surface, clamped or strapped in with the plate or form, or clamped alongside thereof, which strip, extending longitudinally of the direction of travel of the rolls would engage and revolve the same. This method, however, has not been entirely satisfactory because within a relatively short time the bearer strip wears a groove into the relatively soft and plastic surface of the inking rolls by Serial No. 43,961.

traveling over the same area and thereby would become ineffective, that is, would not continue to revolve the rolls.

Attempts have also been made to provide suitable annular friction surface of a rigid material such as metal, alongside the rolls and on the same shafts or spindles, of the diameter as the inking rolls, which annular friction surface would be frictionally engaged by a hard and rigid straight surface thereby revolving the rolls. This method, however, has also been found to be ineffective, because the diameter of the rolls decreases gradually after constant use, due to the gradual drying out of the roll material, and the attendant shrinkage of the rolls. Due to the different diameters thus obtained between the rolls and the annular friction surface, it was found that the surface speed of the rolls would not equal the actual speed with which they travel over the form, thereby also causing a slight scraping off of the ink, on to the edges of the type, which, as will readily be seen, will prevent a clear impression or print from the plate.

In order to overcome these difficulties I have devised a bearer strip having a relatively wide body of a lesser height than the printing surface, and adapted to be clamped in the frame alongside of the plate or form, to extend longitudinally of the direction of travel of the ink rolls, and having thereon a relatively narrow strip of the same level as the printing surface and disposed atan angle to the body, and hence at an angleto the direction of travel of the rolls.

By my novel construction, the ink rolls will be engaged by the narrow surface of the bearer block in constantly varying positions, and thus no groove will be worn into the surface of the rolls. Furthermore, since the rolls do not ride onto the form and the bearer strip in the same position any two times, the bearer surface of the bearer block will also engage a different initial position upon the rolls.

For the purpose of illustrating my invention, I have shown in the accompanying drawings forms thereof which are at present preferred by me, since they will give in practice satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized 'and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein` shown and described.

Referring to the drawings Figure 1 represents plan view of a plate or form set up with two bearer blocks Vem-` bodying my invention.

Figure 2 represents an end elevation of the same.

Figure 3 represents a perspective view of a bearer block'V embodying my invention.

Referring. tothe drawings, in which like reference Characters indicate like parts, l designates theA metallic frame commonly employed on printing presses,in which the form isA madefup., of'suitabletype or plates 2, by tlievrneansy of the, clamps 8. One or several bearer blocksV 41 of my novel construetionv may be clamped inside the. frame in', a manner shownin Figure l, disposed longitudinally of the direction'of travel of theA inkv roll,l 5;. The bearer block i-v is proA vided with.; parallel edges G, whereby the saine is. clamped, and an upper surface 7 which below, the printing,y surface. The bearer strip.y 8, protruding from lthe upper surface'; ofthe blpckhis; formed integrally therewith, and is disposed at an angle to the body,V of thuebearer;` block. TheA upper surfacefofY thestrip islsubstantially on the level of the printing',v surface.

In setting.. up` a.l forni, one or several of these bearerblocksr may bemcla'mped. in the franiesand thefheightof the bearer surface 8 may then1 be` adjusted. byY backing it up, if necessary., vithfthlel Sheets. Ot Para, HS iswell knpwn in the art.

It will now; be.apparent that Ixhave de-v vised, a, novel and, useful printers bearer strip, which, embodies the. features47 ofv advantage enumerated asy desirable` in the; statev nient of the 'inventionl and' the above de? sc riptiomandwhile I: have, inthe present instance, shownandg described a preferred embodiment thereof whichwill give in practice satisfactory and reliable results, it is to be understood that such embodiment is isceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention, what l claim as new and desire to secure by Lettersv Patent is:-

l. A printers bearer strip of the character stated, comprising an. elongated body portion having substantially parallel longitudinal sidesand anupper surface of a lesser height' than the height of the printing surface, and an elongated bearer strip on said upper surface, disposed at an angle to said parallel sides. Y

A printers bearer strip of the characterdescribed, comprising an4 elongated body portion having substantially parallel longi# tudinal sides and an upper surfaceof lesser height than thedieight of the printing surface, and a bearer strip on said. upperV surface formed. integral with. said. body portion, and disposed at an, anglez to said, parallel sides.

3. A printers bearer strip of the character stated,f comprising an elongated body portion` having substantially parallel longitudinal sides and of a heightless than the height of the printing surface andan upper elongated bearer; strip carried by said. body portion, disposed at an. angleto said par-al# lel sides. i

A. printers bearer strip. of the character stated, comprising an elongated body portion having. substantially parallel. longitudinal sides and ofy a height less thanthe height ofjthe` printing surface, and an upperelongated. bearer strip carried by said body portion, and formed integral therewith, disposed at airanglel to said parallelsides'.

Y JoHN` KYLE.

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