US1898610A - Web perfecting rotary printing press - Google Patents

Description

Feb. 21, 1933:. H. M. BARBER WEB PERFECTING ROTARY PRINTING PRESS Filed July 1, 1931 lNVENTOR ATTORNEYS Patented Feb. 21, 1933 UNITED STATES PATENT HOWARD M. BARBER, or rAwcA'rUox, CONNECTICUT, ASSIGNOR To 0. :e. oo'rrnnm. a; c:

sous conrnuy, or WESTERLY, nnonn ISLAND, A CORPORATIONYOF DELAWARE wEBrERFEc'rInG ROTARY PRINTING rREss Application filed July 1,

The object of my invention is to provide non-printing means in a web perfecting rotary printingpress, for exerting a uniform blotting pressure on the non-perfected web throughout its printedportion, whereby the appearance of the printed portion on the first printed side of the web will be improved by the elimination of the variation in tone so prevalent where the printed matter on the first printed side of the web does not coincide with the printed matter on the second printed or perfected side of the web. This is particularly advantageous Where pictures are the impression or printed matter on the second printed side of the web is subjected to blotting pressure by the form cylinders of the second printing unit which causes the said portion to offset to a greater extent and thus present a lighter and duller tone than where no pressure has been applied. This non-uniform pressure produces different shades in the impression on the first printed side of the web and the uniformity of the impression is therefore destroyed.

This variation in tone in the impression on the first printed side of the web is caused by the ofiset web on the impression cylinder of the second printing unit taking off more ink from the first printed side of the web where pressure is applied thereto by the form cylinders of the second printing unit. I

To eliminate this variation in tone on the first printed side of the web due to this offsetting and to ensure a uniform tone and color in the impression on the first printed side of the web, I have provided an auxiliary pressure means which coacts in the present instance with the impression cylinder of the second printing unit before the web passes to the form cylinders of that unit for perfect- 1931. Serial No. 548,138.

Fig. 1 represents a diagrammatic side View 7 e of so much of'a double four color web perfecting rotary printing press as will give a clear understanding of my invention;

Fig. 2 represents a detail face view of the perfected side of a web, illustrating a 0011-. dition where the impression on the first printed side of the web does not coincide with the impression on the-second printed side of the Web, as commonly occurs; and

- Fig. 3 represents a detail face view of pressure roller which, in this instance, has its surface built up to exert pressure on the 7 non-perfected web. at this point which will not receive pressure from-the form cylinders of ]the second printing unit in perfecting the we -The first multicolor printing unit may comprise an impression cylinder 1 and four form cylinders2,3, 4, 5, coacting therewith to print the first side of the web 6 in'four colors. v

The second multicolor printing unit may comprise an impression cylinder 7 and four form cylinders 8, 9,10, 11 coacting therewith,

to perfect the web by printing in four colors 50 von its opposite side. V r

' The offset web is denoted'by 12 and it is passed in the usual manner around the impression cylinder ,7 of the second printing unit. 7

The means which I have shown for exertingblotting pressure upon the desired portion or portions of the non-perfected web against the olfset'web 12 before the web is perfected by the form cylinders 8,9, 10,11, ,7 comprises a cylinder 13 mounted in position to engage the non-perfected web as it passes around'the impression cylinder 7 of the second printing unit over the offset web 12 and before the non-perfected web is engaged by the form cylinders of the second printing unit. i I

This pressure cylinder 13 is used to exert pressure upon the entire non-perfected Web or upon any desired portion thereof by building up the face of the cylinder withany suitable material asmetal, paper, etc. In the present instance the face of the pressure cylinder 13 is built up as shown at 14, to exert blotting pressure upon the non-perfected web at those points which will not receive pressure from the form rollers S, 9, 10, 11 when perfecting the web. t a The form cylinders 2, 3, 4, 5 of the first printing unit may be positively driven from theimpression cylinder gear 15 through the gears 16, 17, 18 and. 19 respectively. The

.form cylinders 8, 9, 10, 11 of the second printing unit may be positively driven from the impression cylinder gear 20. through the gears 21, 22, 23 and 24 respectively, The blotting pressure cylinder 13 may also be positively driven from the impression cylinder gear 20 through the gear 25. Theimpression cylinder gears Y15 and 20 of the two printing units may be driven in unison through the gears26, 27, bevel gears 28, 29, shaft 30, bevel gears 31, 32 and gears 33, 34:. .Fromthe above description it will be seen that I have provided non-printing means whereby the impression on the first printed side ofthe web may be subjected to blotting pressure in whole or in part, as the case may be, to obtain a uniform tone and-color which is so much tobedesired in web perfecting work.

- -While I have described my invention in connection with a double multicolor Web perfecting press I do not wish to limit myself to .of the'non-perfected web.

web on the impression cylinder for exerting blotting pressure on more or less of the non perfected web.

3. In a web perfecting rotary printing press, first and second printing units, and a non-printing pressure cylinder coacting with the impression cylinder of the second printing unit for exerting blotting pressure on more or less of the non-perfected web.

In a web pe'rfecting rotary printing press, first and second printing 'units, an offset web passing around the impression cylinder of'the'second' printing unit, and a nonprinting pressure. cylinder coacting with the offset web onthe second impression cylinder for. exerting blotting pressure on more or less .5.- In; a web perfecting rotary printing press, first and second ;printing units, and anon-printing pressure cylinder havingits face built up at predetermined points for .of its impressionwhich will not be. subjected to pressure. by the form cylinder or cylinders of the second sprinting unit. I

In testimony, that I- claim the foregoing as my invention, I have signed myname this 29th day of June, 1931., v i Y HOWARD M. BARBER. 1

sucha press but contemplate the use of this auxiliary pressure means in connection with presses which perfect-in one or more colors.

It isevident that various changesmay be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, and hence I do not intend to be lim- V ited to the particular embodiment herein shown and described, but

What I claim is 1 In a web perfecting rotary printing press, first and second printing units, and

non-printing means coacting with the second it printing unit for exerting blotting pressure on more or less of the non-perfected web.

'2. In a web perfecting rotary printing 7:

press, first and second printing units, an offset web'passing around the impression cylin der of the second printing unit, and nonprinting means coacting with said offset

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