US1312034A - Of rochester - Google Patents

Description

' .F. G, JONES,

ATT/TCHMENT FCIR COATING MACHINES. APPLICATION FlLED JULY 23. 1927.

12 553 I Patented Aug". 5 1919.

2 SHEETS-SHEET I.

Hum

L G. JONES.

ATTACHMENT FOR COATING MACHINES.

APPLICATION man J ULY 23.1917.

PatentedAugfl 5 1919.

2 SHEETS-SHEET 2.

J'UHN Gr. JONES, F ROCHES NEW YURK, hSSIG-NOR TU EASTM a bl KODAK GOANY,

0F WUCHESTE, NEW YURK, A COORATION 015 NE YOEK.

ATTACEN'JL FUR COATING-MACHINES.

Specification of Letters Patent.

Patented dog, 5, thin,

Application filed July 23, 1917. Serial No. 182,121.

To all whom it may concern:

Beit known that l, JOHN G. Jones, of the city of Rochester, in the county of Monroe and State of Newlork, have invented certain newand useful Improvements in Attachments for Coating-Machines; and l do hereby declare the followingto be a full,

. clear, and exact'description of the same, reference being had to the accompanyin drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates to machines for coating webs of paper, or other material, with substances applied in liquid, or

. semi-liquid form, and it has for its object to illll lid whereby, when applying a comparatively thin coating layer to a web, articles of foreign matter, grit, or undisso ved granules of.

ass beneath 0 these and coatlngimaterial may slip, or the coating gage, or knife.

other ends the invention consists in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel featuresbeing pointed out in the claims at the end of the specification.

ln the drawings: Figure l is a detail side elevation of a portion of a coating machine showin the general location and arrangement o the parts and mechanlsm comprlslng my present invention; 1

Fig. 2 is a top plan view thereof; FFig. 3 is an enlarged view of a portion of Fig. 4f is a front elevation of the scraper, Fig. 5 is a detail sectional view en on the line 5".'5 of Fig. 3; I

Fig. 6 is a similar view taken on the line fi -6 of Fig. 3;

Fig. 7 is an enlarged detail view of the cooperating working portions of the web suport and scraper.

reference characters throughout the drawings indicate similar parts,

The mechanism embodying my resent invention is adapted. to coating mac ines used for applying to a continuous ribbon, or Web, of paper, fabric, or other sheet material, a coating of fluid, or semi-fluid material, which it is desired to spread evenly across the face of the web. The general arrangement of such machines is well known, and l have, therefore, only shown a ortion of the forward end of a coating mac ine, comprising the coating roller 1, j ournaled on the frame 2 and rotating in a tray, or bath' 3 containing the coating material which it conveys onto the web indicated by A. The latter, it will be understood, is drawn from a supply roll, located in rearof the coating roll, and after passing the latter and having the coating thus applied evenly distrlbuted, or leveled, returns over one or moresupporting rollers, and is finally wound upon a rewinding arbor.

evices embodying my invention cooperate with the web after the coating material has been applied and are supported upon forwardly extending brackets a at op posite sides of the machine. The precise position of the cooperating web support.

and scraper'with regard to the path of the web is not essential, but for convenience-in operation and ease of inspection l prefer the general arrangement of parts shown in the drawings, comprising a guide roll 5 from Y which the coated web passes upwardly into contact with the supporting surface, with which the scraper cooperates, from which i the web is carried rearwardly, as shown particularly in Fig. l. The supporting surface which engages the rear face of the web is preferably curved, and to this end is (formed bf a cylindrical bar 6, in the periphery of which one or more longitudinallylextending'grooves, or channels 7 are out, thus providing two parallel edges or and A t, whichare spaced to provide a short distance across the entire width of the web which is unsupported, thus allowing the web to yield laterally when necessary in a direction away from the scraper. The supporting edges of the slot, or channel, are, however, located sufliciently close to each other, depending upon the weight of the paper, fabric, or other material, so that as the latter is drawn across the face of the support it is held freeand yet the formation of wrinkles, or cockles prevented. The surface of the bar adjacent the edges a and b of the slots 7 constitutes the working face of the support, and as this part is subject to wear it is desirable to provide several of the slots 7 and to support the bar at its ends in boxes 8, in which it may be rotated andclamped by set screws 9 with one or another of said slots in operative position. The web A in passing through the machine is under tension and it is, therefore, desirable that the bar be supported intermediate its ends, especially if the webs are comparatively wide. Therefore, I have provided a brace extending in rear of the bar 6 comprising parallel guides 1010v attached at their ends to the boxes 8. Between the guides are cheek blocks 11, each containing a set screw 12 engaging a bearing block 13. The adjustment of the set screws 12 gives an added stability to the bar 6 to prevent it from bending rearwardly under the tension of the web across its forward face. Distortion of the bar. however, is not always due to the tension of the web and occasionally difliculty is experienced either as a re sult of thermal. changes, or internal strains, due to machining operations, and for this reason Lalso provide means for moving the bar rearwardly aswell as forwardly, by making the blocks 13 in the form of segmental collars, which are slipped over one end of the bar 6. In each of these collars is threaded a draw bolt 14 passing through the blocks 11. Thus it will be seen that the bar at one point may be thrust forwardly by a set screw 12 and at another point retracted by one of the bolts 14. This means of adjustment it will be seen provides great rigidity in the member forming the supporting sur- I face of the web, which may be adjusted here .and there throughout its length to bring the working face of said surface into a perfectly straight line. This arrangement of adjusting devices possesses a further advantage in that where it is desirable to apply a temperature controlling medium, such as steam, or cold water, to the supporting .surface the bar 6 may be made hollow, as

shown in Figs. 5 and 6, and-suitable piping conn'ections attached at each end, as indicated by 15, Fig. 2.

The cooperating element com rising the gage bar, or scraper, is prefera'b y mounted at right angles to the supporting surface in front of the groove 7 its point, or working edge, being preferablyilocated midway between the edges a and b of said groove, but slightly beyond the plane common to said edges. It is not intended that the working edge of the scraper shall engage the outer face of the web, but rather that it shall be separated therefrom a distance represented by the thickness of the coating layer to be applied, and as this coating is usually measured in thousandths of an inch delicate micrometer adjusting devices are provided for the scraper.

In the preferred arrangement of these parts the support 16 is mounted in boxes 17 on the outer ends of the brackets 4, and in order that the support and the scraper carried thereon may always have a definite relationship to the bar 6, the boxes 8, in which the bar is carried, are secured rigidly to the support b means of the bolts 8. The upper face of the support 16 is flat and at each end is a sliding block 18 between which lies a scraper 19, pivoted to the blocks by pins 20, which permit it to rotate from its normal full line position to the dotted line position shown in Fig. 6. The blocks 20 are, slotted and guided on pins 21 surrounded by bushings 22, which support cover plates 23. Beneath the latter is arranged a spring 24 in each of the blocks, which operates against the rear pin and the forward end of the slot, thus exerting a constant tendency on the scraper to move it toward the cooperating member, or web supporting surface. The exact pos tion of the scraper is determined very accurately by two adjusting screws 25 extending transversely through the scraper bar 19 at its opposite ends. The outer ends of the screws are pro,- vided with knurled heads 26, provided with graduations cooperating with an index member, or pointer 27, and at their inner ends the screws rest against web supporting members, and where the latter is made in the form of a bar, it is provided with accurately turned annular grooves, or channels 28, which are cut slightly deeper than the longitudinally ext ending recesses, or grooves 7. By this arrangement of parts it will be seen that the adjusting screws engage the curved surfaces of the bottoms of the grooves 28 on the radii of the circles so that when it is desired to disengage the scraperit may be easily tilted upwardly by rotating it on the pins 20 and when it is again forced downwardly into operative position the ends of the screws 25 engage the cylindrical surfaces of the grooves 28, which act as cams to force the blocks 18 backward against the tension of their springs 24.

The rigidity of the scraper bar and its perfect alinement with the cooperating web supporting surface is assured by providing it with another overlying bar 29 bolted lid nataoaa thereto at its ends, as indicated at in Fig.

3. This bar 29 is of sufficient dimensions and tensile strength in comparison with the bar 19 so that the latter may be deflected transversely at the center by providing defleeting pressure screws 31 and 32, which engage opposite sides of the bar 29 and are carried in studs 33 and 34f. Since the scraper is subject to wear and in certain classes of work may require frequent sharpening, or renewal, T prefer to provide the bar 19 at its inner edge with a 'longitudi nally extending groove in which is detach ably secured a strlp- 35, the edge 35 ofwhich may be formed as desired.

Tt is desirable in some classes of work that the temperature of the knife, or scraper, be maintained as nearly as possible to that of the web supporting surface with which it cooperates, or in case the coating materialwhich is applied to the web A be heated, that the [scraper should be'likewise heated and maintained at such a temperature thatthe coating material is not cooled when brought into contact therewith. To this end the support 16 is provided with piping con nections 16 by which a temperature controlling medium, such as water, or steam, may be circulated through the support. The latter is also provided wlth a flat top against which the scraper bar 19 rests throughout its length so that the temperature of the sup port is readily transmitted to the scraper.

- till hill till

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Tn operation the knife, or scraper, is p0- sitioned with its edge 35 directly in front of the groove 7 at the front side of the supporting bar 6, as shown in Figs. 5, t5 and 7. By means of thescrews 25 the scraper is zmoved inwardly and outwardly at one, or both ends, and if need be, is sprung at the center by means of the tension bolts 31 and 32, and the bar 6 is also made perfectly straight by means of the bearing blocks l3, and the screwslfl and ll. The purpose of these adjustments, as it will be understood, is to provide two' absolutely straight parallel opposing surfaces, one of which supports the web while the other determines the thickness of the coating layer applied thereto; The web A, which is threaded between the scraper and the bar 6, receives an excess ofthe coating material from the roller l, which is carried upwardly, as shown in Fig. 7, into contact with the edge of the knife, or scraper, which distributes the coating evenly in a thin sheet. I

.Tn coating papers, especially with mate rials which contain substances of a granular,

or crystalline nature, dimculty is experi-.

enced if it happens that these particles are not thoroughly dissolved, and also if dust, or other foreign particles of matter are carried in the coating solution, because, especially when the coating layer is thin, such gritty particles will lodge in front of the shoulders a and b, which are so close togather that the web lies flat between them, but which are separated sufiiciently to perunit the web to be deflected, at any point between its extreme edges sufficiently to allow the undissolved granule of the coating mate- ..rlal, or some foreign substance, such as a piece of grit, to be carried around or beyond the edge of the scraper without either tearing the paper, or streaking the coating thereon,

T claim as my invention:

1.v Tn a coating machine,the combination with a bar having a groove across which a web of paper to be coated passes, of a scraper arranged to cooperate with the web between the edges of the groove in said bar.

2. Tn a coating machine, the combination with a web supporting member having a bearing face against which the web to be coated bears, of a scraper positioned in front of the support and out of contact with the face of the web thereon, said bearing face having a groove the edges of which sustain the web at each side of the working edge of with a'bar having a curved face over which a web to be coated passes having a longitudinally extending channel across which the web travels, of a scraper opposing said chan nel having provision for one adjustment transversely toward and fromthe bar and movable bodily into and outof operative position.

' 4:. Tn a coating machine, the combination with a bar having a curved faceover which a web to be coated passes having a longitudinally extending channel across which the web travels, of a scraper provided with a working edge facing said channel and havm provision for a micrometer adjustment Uative to the bar and rotary movement to carry it bodily into and out of its adjusted posltion.

5. Tn a coating machine, the combination with a hollow bar having a narrow longitudinal groove in its face, of a scraper located in front of the bar having a narrow working edge positioned between the edges of the groove, a hollow support for the scraper, means, foradjusting the latter and pipe connections for supplying a temperature controlling medium to said bar and support.

6. Tn a coating machine, the combination with a bar for supporting a web to be coated,

of a scraper. extending substantially at right angles to the face of the bar, means on the scraper engaging the bar for effecting adjustment of one of said parts toward and from the other.

7. In a coating machine, the combination with a rigid support having a face over which a web to-be coated passes, of a scraper located in front of said face, adjusting devices for the ends of the scraper cooperating with the support and means carried by said scraper for independent? adjusting the center thereof toward and rom the face of the support.

JOHN G. JONES.

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