US748135A - Offset-preventing mechanism for printing-presses. - Google Patents

Description

No. 748,135. PATENTBD DEC. 29, 190E.

. H. A.1W.. WOOD. oEEsET PREVENTING MECHANISM FOR-PRINTING RESSES.

AEPLioATIoN EILED SEPT. 21, 1896. RENEWED MAY 90s HOMODEL. V r

3 SHEETS-SHEET 1.

Witnesses. I inventor, WQ K L, H.A'.W.Wood. X 3? 3 MEE W Attorneys,

m: moms Ptrzns co. momumm. wAsumcTQN, 01c.

I No. 748,135.

PATENT-EDDE'E. 29, 1903.

I A. W. WOOD. oEEsET PREVENTING MECHANISM FOR PRINTING PEEssEs';

APPLICATION EILED sEPT. 21. 1896, RENEWED MAY 8. 1903. N0 MODEL. s EHEET$-EHEET 2.

I nve ntor. H. A.W.'W00d- *1 I )Xyidfid Attorney-8 Witnesses.

PATENTEDDEG. 29,1903.

' H. A. W. W001).. OFFSET PREVENTING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED SEPT. 21, 1896. RENEWED MAY 8. 1903.

' a SHEETS-SHEET a N0 MODEL.

Inventor HAWWoodf Wurisses Attorney-3.

UNITED STATES Patented December 29, 1903.

PATENT OFFICE.

HENRY A. WISE WOOD, OF NEW YORK, N. Y., ASSIGNOR TO THE CAMPBELL PRINTING PRESS AND MANUFACTURING COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

OFFSET-PREVENTING MECHANISM FOR PRlNTlNG-PRESSES.

SPECIFICATION forming part of Letters Patent No. 748,135, dated December 1903- Application filed September 21, I896- Renewed May 8,1903. Serial No. 156.280. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. WISE WOOD, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a new and useful Improvement in Offset-Preventing Mechanism for Printing-Presses, of which the following is a specification.

The object of my invention is to provide simple and efficient devices for preventing offset in printingpresses.

An oifset-preventing device constructed according to my invention is especially applicable to the ordinary double-cylinder sheet-perfecting printingpress. In a press of this character the side of each sheet printed by the first impression-cylinder necessarily comes in contact with the second impression-cylinder when the second side of the same is printed.

Ink from the freshly-printed side of the sheets will therefore be set 03, as it is called, on the surface of the second impression-cylinder, and the ink thus set oif is apt to be 011"- set onto the succeeding sheet or sheets, proz5 ducing blurs or blots upon the first printed side.

In its preferred form an ofiset-preventing device constructed according to my present invention is arranged to handle a plurality of offset-sheets, preferably two sheets being employed, and is provided with sheet-transferring devices and devices for rendering the offset-sheets capable of further use, which are arranged to cooperate so that one oEset-sheet will be secured upon the surface of the second impression-cylinder of a printing-press while the other offset-sheet is being rendered fit for further use.

In the accompanying three sheets of drawings, Figure 1 is a partial side view of a printing-press provided with ofiset-preventing devices constructed according to my invention. Fig. 2 is a sectional view of the same. Figs.

3 t0 6, inclusive, are diagrammatic views illustrating dilferent relative positions of the offset-sheets; and Figs. 7 and 8 are detail views illustrating the mechanism which I preferably employ for actuating the sheet-gripping devices.

An offset-preventing device" constructed so according to my invention comprises means whereby at intervals of a number of rotations of an impression-cylinder an offset-sheet will be taken from the impression-cylinder and another sheet supplied thereto, the sheet thus 5 5 removed being held and so manipulated that at the end of one of said intervals the same will be transferred back onto the impressioncylinder and the sheet then on the impression-cylinder removed, so that said two sheets will be alternately transferred onto and from said impression-cylinder. When the sheets are not on the impression-cylinder, the same are preferably subjected or acted upon by devices which will render the same capable of further use.

In its prefered form my ofiset-preventing device comprisesa scrubbing-cylinder havin g sheet-cleaning devices codpei'ating therewith, two transfer-cylinders, one transfercylinder being arranged to strip an ofisetsheet from the impression-cylinder of a printing-press and to transfer the same to the scrubbing-cylinder and the second transfercylinder being arranged to strip the 0E- set-sheet from the surface'of the scrubbingcylinder and transfer the same back to the impression-cylinder. By adopting this arrangement and employing two ofiset-sheets on offset-sheet maybe secured in place on the surface of the impression-cylinder while the second ofiset-sheet is being scrubbed or cleaned.

Mounted in the cylinders of my oifset-preventing devices are the ordinary sheet-grippers, and said sheet-grippers are connected so that they will be actuated only when a number of sheets have been printed. By means of this construction an offsetsheet will be kept upon the impression-cylinder until it has become soiled, when it will be stripped 0d and cleaned, a new or clean sheet being automatically provided for replacing the olfset sheet which is removed.

Referring to the drawings and in detail, A designates the ordinary side frames of a printing-press; B, the bed thereof; 0, the first impression-cylinder; D, the second impression-cylinder; E, a feed-board, and F a flydelivery mechanism for removing the printed sheets from the second impressioncylinder and depositing the same upon a delivery-table Gr. These parts may be of any of the ordinary or approved constructions and need not be herein described at length.

Journaled in the side frames of the press substantially over the second impression-cylinderis acylinder H, which I term the scrubbing-cylinder.

Cooperating with the cylinder H, I provide sheet scrubbing or cleansing devices. In their preferred construction these cleansing devices comprise a fountain K, which is arranged to deposit a supply of oil and benzene on the surface of the soiled offset side by means of the rollers 10, 11, and 12. Instead of using oil and benzene other cleansing fluids may be used.

Engaging with the scrubbing-cylinder H and preferably driven in opposition thereto are a plurality of scrubbing or cleansing rolls. as 13 and 14, which engage a common roller 15. Two transfer-cylinders I and J are arranged to cooperate with the scrubbingcyl-' inder H and the impression-cylinder D, the cylinder I being arranged to strip the soiled offset-sheet from the surface'of the impression-cylinder D and transfer the same to the scrubbing-cylinder H, the second transfercylinderJ being arranged to strip the cleansed oifset-sheet from the surface of' the scrubbing-cylinder H and transfer the same back to the surface of the cylinder D.

Mounted in the impression-cylinder D in addition to the usual grippers-for the printed sheet are a set of grippers 16 for engaging the offset-sheets.

The transfer-cylinder I, the scrubbing-cylinder H, and the second transfer-cylinder J are provided with sets of grippers 1'7, 18, and

19, respectively.

The gearing for driving the'parts may be arranged in any preferred or desired manner.

As shown most clearly in Fig. 1, 20 and 21 designate the ordinary gears, carried by the impression-cylinders C and D.

The transfer-cylinders I and J are provided with gears 22 and 23, which mesh with and are driven from the pression-cylinder D.

The scrubbing-cylinder H is provided with a gear 24, which meshes with and is driven from the gears 22 and 23.

The oil-depositing rollers 11 and 12 are preferably driven by their friction against the scrubbing-cylinder; but,"if desired, they may be positively driven in any desired manner.

Secured upon the end of a shaft of the roller gear 21 of the im- 15 is a gear 25, which meshes with and is driven from the gear 24.

The scrubbing-rollers 13 and 14 are preferably frictionally driven from the roller 15; but, if desired, these rollers may be positively geared together.

The four sets of grippers 16, 17, and 18 for handling the oEset-sheets are preferably arranged to act only after a plurality of sheets have been printed by the press. Each of these sets of rippers is secured upon a rock-shaft in the ordinary manner, which is provided at its end with a cam 26, having a slot or groove 27 formed therein, as most clearly illustrated in Fig. 8. A movable carriage 28 is mountedinside of the framework of the press and is provided with a plurality of projecting pins 29, which may be brought into position to actuate the grippers. The carriage 28 will be shifted into operative position by means of a bell-crank lever 30, connected to a link 31, having a roller 32 journaled thereon in position to be operated bya cam 33. The cam 33 is preferably geared to turn once for every twenty sheets printed on the press. As shown, the cam 33 is secured upon a shaft 34, having a worm-wheel 35 secured thereon which is driven by means ofa worm 36. The Worm 36 is driven by means of bevel-gears 37 and 38, the bevel-gear 38 being secured upon a cross-shaft which may be driven in any desired or preferred manner from the ordinary parts of the printing-press. The carriage 28 is normally held in its retracted or inoperative position by means of a spring 39, connected to the link 31.

The operation of my oifsetpreventing mechanism is most clearly illustrated in the diagrammatic views shown in Figs. 3 to 6, inclusive. As shown in Fig. 3,one offset-sheet a, shown in heavy lines, is being stripped from the surface of the impression-cylinder D by the first transfer-cylinder '5, while a second ofiset sheet I) is being stripped from the scrubbing-cylinder H by the second transfer-cylinder J. In Fig. 4 the soiled offset-sheeta is beingtransferred to thesurfaceofthescrubbingcylinder H and the second offset sheet is being transferred to the impression-cylinder D. The soiled offset-sheet will be retained upon fihe scrubbing-cylinder H while a number of sheets are being printed by the press, and the soiled oEset-sheet has time to be thoroughly cleaned. As shown in Fig. 5, the offset-sheet a, has passed nearly onto the surface of the scrubbing-cylinder H and the offset-sheet b has passed substantially onto the surface of the second impression-cylinder B. In Fig. 6

the offset-sheet a is being transferred back to the impression-cylinder D while the offsetsheet I) is being transferred to the scrubbingcylinder.

Iam aware that many changes may be made in offset-preventing devices by those who are skilled in the art and that certain parts of my invention can be used in difierent locations and in connection with different forms of printing-presses without departing from the scope of my invention as expressed in the claims. I do not wish, therefore, to be limited to the constructions which I have shown and described; but

What I claim, and desire to secure by Letters Patent of the United States, is

1. In a device of the class described, the combination of an im pression-cylinder, means for supplying an oifset-sheet to said cylinder, and removing another offset-sheet from said cylinder, and then, at an interval of a number of impressions, transferring the sheet previously removed back to the impression-cylinder, and removing the sheet then on the impression-cylinder.

2. In a device of the class described, the combination of an impression-cylinder of a rintin -nress means for automatically su i p a I a plying said cylinder with an ofiset-sheet and removing an offset-sheet therefrom, and, at an interval of a number of impressions, removing the sheet thus supplied to the impressioncylinder, and restoring the sheet previously on the impression-cylinder, and means for making said offset-sheets capable of further use while removed from the impression-cylinder.

3. In a device of the class described, the combination of an impression-cylinder of a printing-press, a cylinder as H, and means for automatically transferring two offset-sheets back and forth between said impression-cylinder and said cylinder H at intervals of a number of impressions.

4. In a device of the class described, the combination of an impression-cylinder of a printing-press, a cylinder asH, means for antomatically transferring two ofiset-sheets back and forth between said impression-cylinder and said cylinder H at intervals of a number of impressions, and means for rendering the offset-sheets capable of further use While on the cylinder H.

5. In a device of the class described, the combination of an impression-cylinder of a printing-press, devices for rendering offsetsheets capable of further use, and means for automatically transferring offset-sheets back and forth between the impression-cylinder and said devices.

6. The combination of an impression-cylinder of a printing-press, cleaning devices and sheet-transferring devices arranged so that one ofiset-sheet will be secured upon the surface of the impression-cylinder whilea second oifset-sheet is being cleaned.

7. The combination in a perfecting printing-press of the two impression-cylinders, a cylinder as H arranged in connection with the second of said impression-cylinders, cleaning devices cooperating with said cylinder H, and devices for transferring ofiset-sheets back and forth between said second impressioncylinder and said cylinder H.

8'. In a device of the class described, the combination of an impression-cylinder of a printing-press, a scrubbing-cylinder and two transfer-cylinders,one being arranged to strip a soiled oEset-sheet from the impression-cylinder and to transfer the same to the scrubbin g-cylinder, and the second being arranged to strip an offset-sheet from the scrubbingcylinder and to transfer the same to the impression-cylinder.

9. The combination'of an impression-cylinder of a printing-press, sheet-cleaning devices and transfer devices arranged so that one ofiset-sheet will be secured upon the impression-cylinder while a second oifset-sheet is being cleaned, and means for operating the transfer devices only when a number of sheets have been printed.

10. The combination of an impression-cylinder of a printing-press, a scrubbing-cylinder, cleaning devices cooperating with said scrubbing-cylinder, transfer-cylinders, grippers mounted in the impression-cylinder, the scrubbing-cylinder and the transfer-cylinders, a movable carriage having projecting pins for actuating said grippers, and means for bringing said carriage into operative position when a number of sheets have been printed, said parts being arranged to cooperate so that one offset-sheet will be secured upon the impression-cylinder while a second offset-sheet is being cleaned.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

H. A. WISE WOOD.

Witnesses:

HENRY W. COZZENS, .Tr., LOUISE PEOKHAM.

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