US1561517A - Rotary offset web-printing press - Google Patents

Description

B. J. J. GOULDING ET AL' ROTAR; OFFSET WEB PRINTING PRESS Nov. 17, 1925- Filed June s, 1925 Patented Nov. 17, 1925.

UNITED STATES PATENT OFFICE.

BENJAMIN JOSEPH JOHN GOULDING, OF LONDON, AND JOHN SHUTTLEWORTH, OF ALTRINCHA'M, ENGLAND. ASSIGNORS T0 LINOTYPE AND MACHINERY LIMITED,

OF LONDON, ENGLAND.

ROTARY OFFSET WEB-PRINTING PRESS.

Application filed June 5, 1925. Serial No. 35,256.

To all whom it may concern:

Be itknown that we, BENJAMIN Josnrn J OHN GOULDING, a British subject, and resident of London, England, and JOHN SHUT rLnwon'rH, a British subject, and resident of Alt-rincham, in the county of Chester, England, have invented new and useful Improvements in Rotary Offset Web-Printing Presses, of which the following is a specifi cation. l a

i This invention relates to rotary offset web printing presses and has for its object to provide new or improved means whereby the pressure bet-ween the impression transfer cylinders and the plate cylinders can be ad justed for varying impression during the running of the press, and whereby also the trilpping can be effected. special advantage attained by the invention is the considerable saving of time which it effects when the press is being pre pared for printing.

It has generally been found that before the-best printing can be obtained, it is often necessary to make several variations in the adjustment of the pressures between the cylinders; this is responsible for considerable delay, especially as, in someinstances. the plates have to be gummed up during the making of said adjustments, and the gum,

Washed off after the adjustments have been made and before a further trial can be made.

The means according to the present invention enable the pressure to be taken ed, that is to say, the surfaces to be moved out of printing contact after the 1 cylinders have been adjusted to give what is considered to be the correct pressure, and, after the press has been started, to be applied and gradually increased until the correct result is attained.

The invention will now be described by reference to the accompanying drawings which represent a preferred constructional form of said invention, and in which Figure 1 is a side elevation, partly broken away and in vertical section of the pertinent parts of a perfecting printing press embodying the improvements, and

Figure 2 is a transverse section of the same also partly broken away, and taken substantially on the line 2-2 of Figure 1.

In the arrangement as here illustrated, the two plate cylinders 1, 1 areniounted in stationary bearings 2 in the machine side frames 3, and the two impression transfer cylinders l, 4 respectively co-operating with the said plate cylinders, are located between thelatter at a slightly lower level.

The two impression transfer cylinders 4, 4 which simultaneously print on respectively opposite surfaces of the web X passed between them, are each rotatably mounted in two eccentric bushes or bearings 5 or 5 respectively. These bushes are each angularly adjustable in a block 6 or 6 respectively. which is ca able of being raised and lowered in a slight y inclined direction so as to increase and decrease respectively, the pressure between the two impression transfer cylinders 4L, 4 themselves, and between them and the plate cylinders 1, 1.

Each of the eccentric bushes 5, 5, is nor mally secured to its sliding block, 6, 6, by a clamping bolt 7 threaded into the latter and penetrating a curved slot in the flange of the former so that when said bolts are released, the bushes can be turned angular-1y in the res ective blocks. This turning of the bus es 5, 5 may be conveniently effected by means of eccentrics 8, each engaging a notch in the respective flange, and these means enable the pressure between the respective impression transfer c linder 4 or P and cooperating plate cyhnder l or 1, to be adjusted independently of the other correiponding pair of cylinders. As shown in igure 2, each of the eccentrics 8 is fast to ashaft 9 journalled in the respective block 6 or 6* and provided with a squared end 10 for the reception of a key by which it can be turned.

Each of the sliding blocks 6, 6, is connected as by a pin 11 to the upper end of an inclined screw rod 12 axially movable in guides 13, 14, 15, on the respective side frame 3, and on whose lower end is threaded the internally screwed boss of a spiral gear wheel 16. This wheel 16 meshes with a companion wheel 17 fixed with a capacity for angular adjustment, on a horizontal shaft 18 which is common to both of the screw rods 12 at the same side of the press, it being ex plained that what is here described for adjusting the impression transfer cylinders 1, 1 at one end, is duplicated, as shown in Figure 2, at the other side of the press for correspondingly adjusting the opposite ends of said cylinders. To permit of the just-named angular adjustment, the so-called companion wheel 17 is formed'in two parts, one part (the hub) rigidly attached, as by a key 19, (Figure 1) to the horizontal shaft 18 and the other part (the felly) attached to the hub as by slot and bolt connections 20, (see particularly the left-hand part of Figure l) which enable it to be clamped to it in different angular positions.

The horizontal shaft 18 is operatively con nected, as by bevel gearing 21, with a cross shaft 22, which operatively connects together the horizontal shafts 18 at the two sides of the press, and this cross shaft is provided with a hand wheel whose rim is preferably graduated or as shown, peripherally notched, so that, conjointly with a fixed yielding detent or pointer 24-, it will give indications of degrees of pressure which will enable the operator to adjust said pressure according to requirements, and, for this purpose the rim of the hand wheel 23 may bear any desired scale markings.

Each of the before mentioned wheels 17 meshes with a gear 25 secured to a transverse shaft 26 having fast on its respectively opposite ends a tommy head or equivalent device 27 by which it can be turned after the said whee 17 has been, for this purpose, released from the respective hub, this turning of the shaft 26, serving for effecting impression adjustments of the respective impression transfer cylinders at, l, independently of each other. After this adjustment has been made, the fellies are again tightly clamped to the respective hubs so that any subsequent turning of the hand wheel 28 will affect both of the impression transfer cylinders 4, equally.

It will be observed that the bolt and slot connections20 also provide a ready means of effecting any desired initial adjustment of either end of a cylinder a relatively to the other end, and that by virtue of the character of the means for laterally adjusting the impression transfer cylinders, said cylinders will be locked in any position of their lateral adjustment.

Having described our invention, we de clare that what we claim and desire to secure by Letters Patent is 1. In a rotary offset web printing press, the combination of two plate cylinders mounted in stationary bearings, two impression transfer cylinders located between them at a lower level, screw mechanism adapted to adjust each impression transfer cylinder to vary the pressure relationship between the cylinders during the running of the press, and means adapted to effect the said adjustment of the two impression transfer cylinders simultaneously and to the same extent.

2. In a rotary offset web printing press, thecombination of two plate cylinders tween the cylinders during the running of the press.

3. In a rotary offset web printing )ress, the combination of two plate cylinders mounted in stationary bearings, two inn pression transfer cylinders located between them at a lower level, gear-actuated screw mechanism adapted to adjust the two inipression cylinders simultaneously and to the same extent during the running of the press for varying the pre'sure relationship between the cylinders during'the running the press, and releasable devices which permit adjustment of either of the impression transfer cylinders independently of the other.

l. In a rotary offsetweb grinting press, the combination of two plate cylinders mounted in stationary bearings, two impressions transfer cylinders located between them at a lower level, gear actuated screw mechanism adapted to adjust the two impression cylinders simultaneously and to the same extent during the running of the press for varying the pressure relationship between the cylinders during the running of the press, and releasable devices which permit adjustment of either of the impression transfer cylinders independently of the other and either end of each of said cylinders independently of the other end.

5. In a rotary offset web printing press, the combination of two plate cylinders mounted in stationary bearings, two impression transfer cylinders located between them at a lower level, a bearing block at each end of each impression transfer cylinder, guides in which said blocks are slidable in an inclined direction, an axially movable inclined rod secured to each of said bearing blocks, and gear-actuated screw mechanism adapted to axially move all of said rods simultaneously and to the same eX- tent during the running of the press.

6. In a rotary offset web printing press, the combination of two plate cylinders mounted in stationary bearings, two impres sion transfer cylinders located between them at a lower level, a bearing block at each end of each impression transfer cylinder, guides in which said blocks are slidable in an inclined direction, an axially movable inclined screw rod secured to each of said bearing blocks, an internally screwed gear wheel threaded on the lower end of each rod and gearing adapted to rotate all of said gear wheels simultaneously and to the same extent.

7. In a rotary offset weh printing press, the combination of two plate cylinders mounted in stationary hearings, two impression transfer cylinders located between them at a lower ievel,'a hearing block at each end of each impression transfer cylinder, guides in which said blocks are slidahle in an inclined direction, an axially movable inclined screw rod secured to each of said bearing loloclzs, an internally screwed gear wheel threaded on the lower end of each rod, a horizontal shaft at each side of the press, a pair of gear wheels on each of the said shafts meshing with the two internally screwed gear wheels at the respective side, means adapted to effect independent angular adjustment of the gear wheels on the shafts, and gearing adapted to rotate the two horizontal shafts simultaneously.

8. in a rotary oi'fset web printing press, the combination of two plate cylinders mounted in stationary hearings, two impression transfer cylinders located between them at a lower level, a bearing block at each end clined screw rod secured to each of said bearing blocks, an internally screwed gear wheel threaded on the lower end of each rod, a horizontal shaft at each side of the press, a pair of gear wheels on each of the said shafts meshing with the two internally screwed gear Wheels at the respective side, means adapted to effect independent angular adjustment of the gear wheels on the shafts, gearing adapted to rotate the two horizontal shafts simultaneously, two independently rotatable transverse shafts, and a pair of gear wheels on each of said transverse shafts meshing with the gear wheels on the horizontal shafts at respectively opposite sides of the press. 1

In witness whereof we have aflixed our signatures hereto.

BENJAMIN JOSEPH JOHN GOULDING. JOHN SHUTTLEWORTH.

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