US1530677A - Watermarking apparatus - Google Patents

Description

Patented Mar. 24, 1925.

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rnnnnnrc r. xLUNn ANnnENnt-r. oBEnnANNs, or nam, PENNSYLVANIA, As-l VPQBA'ITION OF PENNSYLVANIA.

- l L PAPEBCOIPANY, 0l' BRIE, PENNSYLVANIA, ACOR- f Warmmiete nrrmmns.

Anuman ma zum as, mi. seran no. man.

To all wlwm it may concern:

Be it known that we, Fnnnamo P'. KLUND an'd HENRY F. OnnRMANNs, citizens of the United States, residing atl Erie, in the county of Erie and State of Pennsylvania, have jointly invented certain new and useful Improvements in Watermarking Apparatus; and we do hereby declare the followin to be a full, clear, and exact descriptlon of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of thisspecilicatiom This invention relates to watermarking paper. One of the features of this invention involves the application of a watermarking mechanism to a paper-markin machine at a suitable point between the couc -rolls and the drying cylinders of the machine, while the web is still wet and soft; the watermark ing rolls, being shortz and each carrying a suitable marking ydevice or devices operating underr suitable pressure upon the under surface of the damp sheet after it has left the couch-rolls, and as the sheet passes between a hard moving surface operating in opposition to the marking-rolls, such as a ress-roll, any suitable roll. or a traveling iiand suitable therefor; a preferable feature of this invention involves the making of the type, or other marking devices, of resilient material, such as rubber, so that in its operation upon the damp and soft web ofk paper as it passes between the watermarking rolls and a hard traveling surface, the faces of the type or other marking devices are more or less compressed by the pressure of the marking-roll upon the sheet, which spreads the faces of the type or other marking devices and carries portions of the paper fibre in contact therewith laterally in all directions and thereby produces an in` effacable watermark in the paper web.

Another feature of our invention consists inthe improvements in the mechanism for mounting and adjusting the watermarking rolls, whereby we secure a more eicient supportand adjustment of the rolls with relation to the face of the sheet upon which they operate.

known to thoseskilled in the It is well art, that the process of making paper on a pa er-making" machine .is practicallyl di'- vide into four steps: First, forming the f web of paper, which isy accomplished on anv endless band of wire netting having velv fine meshes; second, pressing vthe embryo paper-web in order to ex ress the surplus water therefrom; third, rying the paperweb in order to evaporate the water which is present in the' web after it leaves the presses; and finally, calendering the web',fso l as to nish it previous to forming the web into rolls or sheets. l c

We are aware that one method of watermarking paper is to bring a wire-covered roll carrying suitable designs into contact with a very soft mass of pulp, while it is being carried on an endless band of wirenetting. At this step the paper is in' a very pulpy condition, and when making certain grades of paper readily takes an impression.

On other grades of paper it is almostv impossible to secure a good plain watermark when the paper is treated to secure the watermark impression at the forming stage on the endless wire band or netting.

We are also awarethat it has been proposed to watermark paper by means of devices situated between the dandy and couchrolls, and at or near the dandy-roll, so that the embryo paper-web will have the desired lmpression imparted thereto before it passes through the couch-rolls.

Watermarking mechanism has also been utilized to mark the damp, soft sheet after itl has left the couch-rolls, and before it reaches the drying cylinders, as well as after it has passed through the machine to the calender rolls when it is in a perfectly dry condition. It will be observed, however,

that in every method of watermarking paper during its traverse through the paper-makmg machine, the mark has always been applied to the face orupper surface of the sheet in contra-distinction to the under or wire surface of the sheet; and it is well known to printers, and others using paper,

that the upper or face ysurface of the sheet.

has a better and smoother surface than the under or wire side of the sheet; and when watermarked on the upper face of the sheet the watermark more or less mars the smoothness thereof; this, it has been found, seriousl interferes with the use of such watermar ed paper when it is desired to print a? to the press-roll D, below the conveyor rolls as well as improvements in the marking mechanism whereby we are enabled to mark the sheet on the wire or under surface thereof, and lthereby overcome the objections made to papers watermarked on the upperV or face surface of the sheet.`

This we accomplish by providing mechanism preferably at one of the press-rolls of the paper-making machine for raising the sheet up against the upper-press roll, and thereby presenting the under or `wire face I of the sheet to the action of Watermarking devices operating against the front of such press-roll, and thereby impressing the watermark in the under or wire face of the sheet after which mechanism is provided for carrying the sheet thence up above and over such watermarking mechanism, and thence to the drying cylinders of the papermaking machine, in the usual manner, Whereby the watermark is impressed and located on the under or wire face of the sheet, which leaves the upper or face side thereof smooth and unmutilated thereby, while leaving a O permanent watermark in the sheet, fully effective for all purposes.

The features of this invention are hereinafter fully set forth and explained and illustrated in the accompanying drawings in which:

Figure 1, is a diagrammatic drawing of' a papermaking machine embodying the invention. p

Figure 2, is an end view in elevation of this improved watermarking apparatus.

Figure 3, is a detail View in elevation of one of the marking-rolls thereof, and its supaort.

l Figure 4, `is another detail view of the rear of one of the marking-roll supports.

In these drawings A indicates the forming wire; B, B the couch-rolls; C the conveyor felt; C its supporting rollers; D, D the first press rolls; E the second conveyor felt; E', E2 its supporting rollers; F, F the last press rolls; G the baby drier; and H the drying cylinders of an ordinary Fourdrinier 'paper-making machine.

In this improvement we place a series of sheet conveyor rolls e, e', e2, to receive the sheet L when it leaves the press-roll D, which rolls c, e and e2 carry the sheet to the conveyor felt E as it passes around a roll E2 adjacent to the roll e2. Adjacent e, e and e", is located the watermarkin mechanism, which operates against sai press-roll. is preferably constructed and located in the manner hereinafter described.

In the frame I of the machine below the rolls c, e', e2 and adjacent to the press-roll D there is mounted a transverse shaft J; and on the shaft J there are mounted and keyed thereto a series of arms K required to support a series of marking rolls, which it is desired to have operate on the sheet L as it passes up over the press-roll D. The arms K are provided at their lower ends with both downward extensions M adapted to receive adjustin screws M, and with lateral projections provided at their outer ends with slotted bearings N adapted to receive supports O pivoted on trunnions O in the slotted bearings N.

In these supports O are rotativel mounted the stems of -yokes P carr 'ing t e marking rolls Q.. The supports (y) are provided on their upper and'outer ends `with ears o, o, through which set-screws o', 0, operateagainst corresponding ears p, of the yoke P, whereby the stem can be rotatively adjusted in its support O. This support O is also split and provided with clamping bolts and nuts O2 by means whereof the stem of the yoke P can be firmly clamped therein.

\ To ears n on the rear part of the supports there is secured the lower portions of vertical leaf springs R which extend upwardly approximately to the top of the arm K, while the lower ends of saidsprings extend downwardly below where they are clamped to the ears n of the support O substantially as far as the projection M of the arm K, Where the spring is engaged by the adjusting screw'M.

In the upper end of the arm K there is also mounted an adjusting screw S provided with a lock-nut S', which screw engages the upper end of the spring R, the

This watermarking mechanism p, on the stem l adjusting screws S and M operating to rock the support O on its trunnions O k slotted bearings N in the lateral projections N of the arm K, whereby the support O can be rocked forward and backward to adjust the marking-roll Q toward and from the press-roll D; and adjust the pressure of the roll Q against the press-roll D by the tension given to the spring R by the and by the adjusting in the of' the spring R; and at the'same time that part of the' mechanism comprising the support O, the yoke I, the marking-roll Q, and the spring R can be removed and replaced as desired by lifting the trunnions O of the support O out of their slotted bearings N in the lateral projections N of the arm K.

In operation tie wet, soft sheet L passes between the press-rolls D, D', and thence between the press-roll D and the markingrolls Q, and thence it passes over lthe series of rollers e, e', c2, to and upon the conveyor felt E, by which it is conveyed between the press-rolls F F from which it passes to the dryer cylinders G and H of the paper making machine; thus we are enabled to effectually watermark the sheet on its under or wire surface, leaving the upper or face side of the sheet smooth and unimpaired by water marks thereon. In Fig. 1, we have illustrated, diagrammatically, a Foundrinier paper machinehaving but two pairs of press-rolls, but it is well known that some manufacturers use such greater number of press-rolls. It is therefore obvious that our invention can, without departing -from the scope thereof, be located at some other press-roll between rLthe first and last, so that the aper after being marked, will ass throug at least one pair of rese-rolls Ibefore it enters the driers.

avin thus described our invention so as to ena le others to construct and utilize the same, what we claim as new and desire to secure by Letters Patent is:

1. In a watermarking mechanism for pa r-making machines, a bracket adapted to e supported on some stationary part of the machine frame, an adjusting screw mounted in said bracket, an arm pivoted on said bracket, flexible means connected with said arm adapted to co-operate with said screw to control the forward thrust of ysaid arm, and a watermarking-roll mounted 1n the free end of said arm.

2. In a watermarking mechanism for paper-making machines, a bracket adapted to be supported on some stationary part of the machine frame, bifurcated arms on said bracket terminating in upwardly o en t c nion bearings, an upwardly exten ing arm on said bracket, an ad]ustmg screw 1n said arm, a swinging arm, transversel trunmons jon said`arm'adapted to be mounted in said machines having a Y tures.

trunnion bearings, means to flimit the downward swing of sald arm, iexible means se.

cured to said swinging arm adapted tori'co operate with said adjusting screw to limit the upward swing of said arm, and a watermarking-roll mounted in the free end of said swinging arm.

3. In a watermarking mechanism for paper-making machines, a transverse bar secured in the frame of the machine, a bracket mechanism removably secured .on said bar, upwardly and downwardly extending arms on said bracket mechanism, an

adjusting screw in each of said arms, horizontally extending bifurcated arms on said mechanism having upwardly slotted trunnion bearingsjtherein, a sleeve mechanism transverse trunnion-pins on said sleeve mechanism adapted to be dropped into said slotted trunnion bearin a leaf spring secured to said sleeve mec anism and adapted to be engaged by said adjusting screws downward and upward swing f whereby the of said sleeve mechanism is controlled, an

-arm secured in said sleeve mechanism, and a y watermarking-roll secured in the free end of said arm. Y

4. In a watermarkingv mechanism for paper-making machines, a bracket 'secured upon said stationary part of the machine trame, a sleeve member horizontally pivoted in 'said bracket, means to ilexibly control the vertical' swinging movement of said sleeve, an arm rotatably secured in said sleeve, means `to control and limit said rotation, and a watermarking-roll mounted in the free end of said arm.

5. In a water marking mechanism for paper-making machine, a bracket secured on some stationary part of the machine frame, a sleeve member horizontally. pivoted in said bracket, means to flexibly control the vertically swinging movement of said sleeve ears on opposite sides of said sleeve,

set screws in said ears, an arm rotatably secured in said sleeve, ,and oppositielg disposed ears on said 'arm adapted to set screws, whereby the rotative movement of said arm in said sleeve can be controlled. In testimony whereof we aix oursigna- FREDERIG P. KLUND. HENRY F. oBERMANNs.

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