US1285842A - Offset-web mechanism. - Google Patents

Description

l. TORNBERG.

OFFSET WEB MECHANISM.

APPLICATION FILED MAR. 9, 1911.

Patented Nov. 26, 1918.

a /Quit 35 ulated in the same manner as the other v UNITED STATES PATENT OFFICE.

ISIDOR TORNZBERG, OF NEW YORK, N. Y., ASSIGNOR TO B. HOE AND CO., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

OFFSET-WEB MECHANISM.

' Patented Nov. 26, 1918.

Application filedMarch 9, 1917. Serial No. 153,545.

To all whom it may concern:

Be it lmown that I, IsmoR TORNBERG, a citizen of the United States, residing at New York city, county of Kings, and State of New York, have invented certain new and useful Improvements in Offset-Web Mechanism, fully described and represented in the following specification and the accomtween the freshly printed side of the web and the second impression cylinder of each set of printing and perfecting cylinders, to prevent offset of ink upon the blanket of the impression cylinder, which ofi'set would cause a smut or smudge upon the-following Web. In order to obtain printing of very fine quality, such as letter press, it is desirable to provide an ofiset web for each of the sets, to insure no ink being deposited on the impression cylinders.

The use of two separate oifset rolls, however, has the disadvantage of imposing more care by the press operator, as these ofi'set rolls have to be braked when the press is stopped or slowed down or otherwise manipoperating parts of the press. Furthermore, there is valuable time consumed in attending to the charging of the two rolls so that after being wound up they will unwind in reverse position to present a fresh side to the web. In many classes of printing, however, where the quality does not have to be as fine as letter press work, for instance, there is no necessity for the use of an offset roll for each of the second couples, one such roll preventing offset for bothof the couples sufliciently for the purposes required. In many instances, it happens that a printer will desire to pr1nt both hlgh quality work, requiring two offset rolls, and

a somewhat lower grade of work, requiring but one offset roll. If, however, the machines as heretofore vconstructed are built for but one oflset roll, they cannot, without considerable change in the mechanism, be made so that two ofiset rolls may be used.

The invention has for its especial object the provision of an arrangement whereby in a printing machine employing two sets of printing mechanism, each set'including printing and perfecting couples, either two offset web rolls may be employed, one for each of the second couples of each set, or one oli'set web roll may be employed for the second couples of both sets, without requiring any changes in the mechanism by which the result is effected, or any changing or shifting of the mechanism, and without the addition of any parts.

For a complete understanding of the invention, reference may be made to the ac companying drawing, in which Figure 1 is a diagrammatic side elevation of a two-roll printing machine, that is, a printing machine having two sets of printing mechanisms, each including a printing and perfecting couple, showing the improved arrangement where two offset rolls are employed, one for each web;

Fig. 2 is a diagrammatic side elevation of the second or upper printing couples shown in Fig. 1, illustrating the improved arrangement where one offset web roll is employed for the second printing couples of each set;

Fig. 3 is a view similar toFig. 2, showing the run of one offset web after it'has been once used and rewound ready for ananother pasage through the machine.

Referring now to the drawings, the invention has been illustrated in connection with a rotary web printing machine of the class known in the art as a two-roll machine, in which there are two sets of printing and perfectin couples 1, 2, 3, 4, each couple including orm cylinders 5 and impression cylinders 6, each of the sets of couples being supplied fromweb rolls 7, 8. The form rolls 5 are inked in any usual manner by inking mechanism 9.

Machines constructed in accordance with the invention will have the sets, of couples spaced apart and in the space between the sets, so as to be between the web paths, will be located a pair of offset web roll sup ports. These supports may be of any suitable character, as frames 10, 11 arranged back to back and provided with lipped grooves 12 for receiving the spindles 13 of the offset rolls. The supporting frames 10, 11 may be of any suitable character, and as shown are made part of the side framework 14 of the machine. The supports are duplicated on the other side of the machine, being part of the side frame thereof, the space between the side frames at this point being left open and free for the offset web to pass therebetween for a purpose hereinafter referred to. Located adjacent the supporting frames at opposite ends is a pair of ofi'set roll spindle supports which may be in the form of rolls 15 for receiving the empty spindles 13 on which the offset web is rewound after it has been passed through the machine.

In machines constructed. in accordance with the invention, guiding means will be provided whereby a separate offset web may be led between the second printing couples of each set, as the couples 2, 4, and back to separate rewinding spindles, or one offset web may be led through both of the second printing couples of each set and back to one spindle. These means may be of any desired character. In the particular construction illustrated, referring first to Fig. 1, there is shown two offset rolls, one for each of the second printing couples. These rolls are marked 16, 16" and are supported in the grooves of the frames 10, 11. The offset web, as, for instance, .web 16, is led over guide rolls 17 between the paper web and the impression cylinder 60f the print ing couple 2, so that it will be between the impression cylinder and the freshly printed side of the web, the offset web being then rewound on one of the spindles 13. The other offset web 16 is similarly led over suit able guide rolls 18 between the other paper iweb and the impression cylinder 6, of the printing couple 4: and back to the other rewinding spindle 13. If, now, it be desired to produce a somewhat lower grade of printing, necessitating but one offset web roll, a. single ofiset web may be led between the second couples of each set. suitable guides being provided for this. Such a construction is illustrated in Figs. '2 and 3. Referring to these figures, an offset web roll, as 16, is supported in the frame 11 and. led over the guide rolls 17 between the paper web and impression cylinder of the couple 2, then over a guide roll 19 located in the side frames above the web roll supports and down under the frames 11 and 10 and about midway thereof to and over the guide rolls 18, by which it is guided between the other paper web and the impression cylinder of the second printing couple a and back to a rewinding spindle 13 located adjacent the fran'ie 10. After the offset web is passed through the machine and has been rewound on spindle 13, it is transferred to the supporting grooves 12 of the frame 10 and run through the machine in the reverse direction to that shown in Fig. '2, as illustrated in Fig. 3, it being rewound on a spindle :21 located adjacent the frame 11.

It .will be seen from the construction described that an improved arrangement has been produced by which either one or two offset rolls may be used in a machine without necessitating any mechanical changes or adjustments and a very simple and effective construction produced. It will also be understood that changes and variations may be made in the specific construction of the various parts and that the invention is 'not to be limited to the precise details shown.

What is claimed is:

1. In a printing machine, the combination with a. plurality of sets of printing and perfecting couples, each set including form and impression cylinders of a source of web supply for each set, a pair of oflset web roll supports and means whereby a pair of offset webs may be led from the supports through the second couple of each set or one offset web may be led from one of the same supports through the second couple of both sets.

2. In a printing machine, the combination with a plurality of sets of printing and perfecting couples, each set including form and impression cylinders, of a source of web supply for each set, a pair of offset web roll supports located between the web rolls, and means whereby a pair of offset webs may be led from the supports through the second couple of each set, or one offset lweb may be led from one of the same supports through the second couple of both sets.

In a printing machine, the combination with a plurality of sets of printing and perfecting couples, each set including form and impression cylinders, of a source of web supply for each set, a pair of offset web roll supports located between the web paths, supports for offset web roll spindles adjacent the supports, and guides whereby a pair of offset webs may be led from the supports through the second couple of each set to each of the spindle supports or one ofi'set web may be led from one of the same supports through the second couple of both sets to one of the spindle supports.

4. In a. printing machine, the combination .with a plurality of sets of printing and perfecting couples, each set including form and impression cylinders, of a source of web supply for each set, a pair of frames for supporting ofi'set Web rolls located beleading one ofiset Web from one of the same tween the Web paths, rolls for the ofiset Web supports through the second -eouple of one roll spindles adjacent the supports on opposet to and through the second couple of the 13 site sides thereof, guides for leading a pair other set and back to one of the roll spindles.

5 of oflset Webs from the roll supports In testimony whereof, I have hereunto through the second couple of each set to set my hand.

each of the spindle supports, and guides for ISIDOR TORNBERU.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

Images