US1265202A - Paste-applying mechanism. - Google Patents

Description

H. C. HERR.

PASTE APPLYlNG MECHANISM.

5, if 6 z 2 w/n. 1 of Patented May 7,1918. '2 SHEETS-SHEET 1 I H, C. HERB. PASTE APPLYiNG MECHANISM. APPLICATION FILED on. 21. 1913.

1,265,202. Patented May 7,1918.

2 SHEETS-SHEET 2.

Wtncsses 1377622 50) y C'- flar/ 922% m-VZZ ,W MW

UNITED STATES PATENT OFFICE.

HENRY G. HERR, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO SOUTH SIDE TRUST COMPANY, TRUSTEE, 0F PITTSBURGH, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

PASTE-APPLYING MECHANISM.

' Specification of Letters Patent.

Patented May '7, 1918.

Application filed October 21, 1913. Serial No. 796,448.

gheny and State of Pennsylvania, have invented certain new and useful Improvements in Paste-Applying Mechanism, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to paste-applying mechanism more particularly designed for use in connection with machines for forming cylindrical casings of a plurality of plies of wound paper or fiber stock. In the manufacture of such articles it has been found desirable to employ as a paste or adhesive silicate of soda, which forms a strong binder between plies, but which, when exposed to the air, quickly becomes incrusted. It is therefore necessary to continually remove the surface portion of the liquid to prevent such incrustation, this having been heretofore accomplished by providing an overflow at the desired height within the tank or receptacle. My improved construction is particularlyintended for use on windingmachines in which, in addition to the winding of the paper stock, a metallic reinforcement is wound-in intermediate the paper plies, and my improved paste-applying mechanism is adapted for coating notonly the paper but also the reinforcement. To this end the invention consists in various features of construction as hereinafter set forth.

In the drawings:

Figure 1 is a section through the paste receptacle, showing the same in relation to the winding-drum.

Fig.1 is an elevation of the mechanism for raising and lowering the paste-applying roll. 7

Fig.2 is a plan view thereof.

Fig. 3 is a cross section through the guides for the paper.

Fig. 4.- is an enlarged section of the paste applying roll illustrating various positions of adjustment thereof.

A is a winding-drum on whichthe cylindrical package is formed; B is a table from which the paper or fiber stock is fed tangentially to the drum A; and C is a table on the opposite side of the drum from which the reinforcing sheet is fed, which latter passes around a guide D imparting the desired curvature thereto and then is delivered tangentially to the winding-drum ad acent to the point of tangency of the paper stock.

To cause the overlapping plies of paper 5 stock to adhere to each other, the paste or adhesive is applied to the underside of the stock as it is fed to the winding-drum, but it is necessary first to feed a length of the stock suflicient to form one convolution upon the drum before the paste is applied, as otherwise the winding would adhere to the drum. This is accomplished by raising and lowering the paste roll which is partially immersed in the tank or receptacle for holding the paste, the specific construction being as follows: E is the tank or receptacle, which is mounted preferably beneath the table B. F is a paste-applying roll mounted upon a vertically-adjustable frame H controlled by a cam I, mounted upon a shaft I, actuated by a rock arm I which in turn is actuated by a cam, (not shown) the arrangement being such that the roll is lifted into contact with the lower face of the paper or fiber stock when the latter is to be coated, and is depressed when said stock is to remain uncoated so as to be'out of contact therewith.

The reinforcement is fed through the guide D as previously described and is embedded between plies of the paper stock, one surface thereof coming in contact with the surface of'said stock which has been coated withthe paste. It is desirable, however, to cement both of the surfaces, and for this purpose a second paste-applying roll G is arranged to contact with the under face of the metallic reinforcement. This necessitates the passing of the reinforcement strip between the rolls F and G, and, as I desire to avoid the use of two separate tanks for said rolls, a single tank is provided with a passage therethrough sufficient for the feeding of said reinforcement. This is preferably formed by spaced partitions J and K, which form therebetween a well or passageway through which the reinforcement may be fed, while upon opposite sides of said partitions are the chambers in which the paste is held. These chambers are connected to each other at opposite sides of the'receptacle by cross-passages J which permit the passage of the paste from one compartment to the other.

For preventing the scum forming on the surface of the adhesive, conduits L and M are connected to the tank E, one entering the compartment in which the roll G is located, while the other connects with the overflow in the compartment having the roll F. The two compartments being connected by the passages J, the liquid will flow from the one to the other and the surface portion will pass toward the overflow and pass outward through the conduit L to the supply tank, being then returned through the conduit M. The roll F is constantly rotated when out of contact with the lower face of the paper or fiber strip by gear wheels 0 and P. The wheel 0 is constantly driven from any suitable source of motion and through the intermeshing teeth drives the wheel P, which is upon the shaft of the roll F. lVhen, however, the frame H is lifted, the wheel P will be disengaged from the wheel 0, but the contact of the roll F with the moving strip of paper will continue the rotation.

The raising and lowering of the roll F will cause a fluctuation of the liquid level in the compartment of the tank in which said roll is located since the overflow will be temporarily out out. which will allow an abnormal quantity of liquid to accumulate. This abnormal quantity of liquid will be displaced by the roll when the latter is in lowered position, which might result in the slopping over of the liquid from the tank when the roll is again lowered, by reason of the fact that the liquid is constantly entering through the conduit M but only passes out when the level of liquid is above the overflow.

Such a result I have avoided by placing the overflow in the compartment having the roll F, and by making the entrance L, to the overflow pipe L of suflicient capacity to take care of the accumulation during the interval in which the roll is raised. The compartment containing the roll G is connected with the compartment containing the roll F by the restricted passages J, which regulate the flow, so that the level in the comlimit the thickness of the film of adhesive carried upward by said roll. Furthermore, I have provlded means for varying the thickness of the film depending upon the relative positions of the roll and the scraper. This latter adjustment is effected by the raising and lowering of the roll, which, when in a position tangent to the plane of the paper, indicated by the dotted line F in Fig. I, will receive a greater thickness of film than when further elevated into the position F Such a result is obtained by rea son of the relation of the scraper Q, to the pivot center H of the frame H, and it will be noted that the higher the frame is elevated the nearer the periphery of the roll approaches the edge of scraper. Thus, when the paste is first applied to the paper a comparatively thick film is deposited, to firmly cement the paper to the reinforcement, as well as to fill the interstices in the latter. When, however, the end portion of the paper strip is reached, if an equally thick film is provided, a surplus would be squeezed out and smeared over the outer face of the package, but such a result is prevented by the raising of the roll to decrease the thickness of the film, as above described.

The location of the paste-roll F is necessarily some distance from the point of tangency of the paper strip with the winding drum A, and as the underside of the strip is coated with adhesive it cannot be supported upon a table. I therefore provide supporting guides It which, as shown in Fig. 3, are arranged below the paper strip, but are in the form of thin bars having a very limited area of contact with the strip. Coating ofthese guides with adhesive is prevented by the cutting of grooves S in the paste-roll F,so

that in depositing the film of paste a narrow strip is left uncoated. which strip registers with the guide B. This will not, however, interfere with the adhesion, for the thickness of film on the paper is suflicient to spread out and cover the unpasted strip by the pressure of one convolution upon another during the winding.

To insure the adhesion of the end of the strip to the adjacent ply, it should be pressed in contact and held for an instant to permit the adhesive to set. For this purpose I have provided a presser bar T, which is supported by resilient arms T over the winding drum A, the lower face of said bar being concaved and being in a position above the end of the paper strip upon the completion of the winding operation. The space between thebar T and the drum is sufficient for the free passsage of the forward end of the paper strip when it is fed into engagement with the drum, but after oneconvolution has been wound on the drum, a second convolution will press against the concave face of the bar T and the pressure will be increased the greater the number of convolutionsf Thus at the end sure is applied by the bar T against the paper, and this is suflicient to insure permanent adhesion of the end of the strip to the underlying ply.

In operation the winding drum A being rotated and the paper strip being fed thereto by mechanism (not shown), the paste is applied to the strip as follows: The normal position of the roll F is one in which it is out of contact with the paper strip, and in such position it is constantly rotated by the intermeshing gears O and P, so as to prevent incrustation with dry adhesive. The roll G is not rotated excepting where it is in contact with the metallic reinforcement, but the hard surface of the reinforcement will scrape off any incrustation which maybe formed on this roll.

lVhen a sufficient length of the paper strip is fed beyond the roll F to form one convolution on the drum A, said roll is raised through the medium of the cam I and timed operating mechanism therefor (not shown). This will disengage the intermeshing gears O and P, and will also contact the periphery of the lOll F with the underside of the paper strip to deposit thereon the film of adhesive applied to the roll. This will continue until the greater part of the paper strip is wound upon the drum, but before the end of the strip passes the roll F, the latter is raised to its highest position F by the cam I, which, by the closer proximity from the scraper Q to the periphery of the roll, will decrease the thickness of the film of adhesive. This, as above described, will avoid the squeezing out of the adhesive at the end of the strip and the smearing of the same over the outer face of the package.

WVhat I claim as my invention is:

1. A paste-applying mechanism, comprising a paste-holding receptacle having two compartments, paste-applying rolls respectively in said compartments, means for raising and lowering one of said rolls, means for supplying and removing paste from the receptacle, and a restricted connection between said compartments for supplying the paste from one to the other and for limiting the fluctuation in level in the compartment for the stationary roll occasioned in the other compartment by the raising and lowering of the roll.

2. A paste-applying mechanism, comprising a plurality of paste-applying rolls, means for raising and lowering one of said rolls, a common paste receptacle provided with separate compartments for said' rolls and a passageway therebetween, means for feeding a sheet to be pasted through said passageway intermediate said rolls, a restricted connecting passage between said compartments external to said passage for said sheet, and means for maintaining a supply of paste to said receptacle.

3.111 a paste-applying mechanism, the combination with a paste-applying roll of means for raising and lowering said roll at predetermined intervals, a paste recep 'tacle in'which a portion of said roll is immersed, means for feeding paste into and out from said receptacle to maintain a constant supply therein, and an overflow for receiving the displaced paste when said roll is lowered in the receptacle.

4. In a paste-applying mechanism, the combination with paste-applying roll, of timed means for raising and lowering said roll, a receptacle for the paste having a supply connection thereto, and an overflow connection, said overflow having an entrance of sufficient capacity to receive the displaced paste upon the lowering of the roll in said receptacle.

5. The combination with means for feeding a paper strip, of a paste-applying roll arranged beneath the path of said strip, a receptacle in which said roll is partially immersed, means for vertically adjusting said roll to contact the periphery ofv the same with said strip and to also raise the roll into a higher position of adjustment, and means for varying the thickness ofthe film of paste upon said roll applied to said strip, the thinnest film being applied in the highest position of said roll.

6. A paste-applying mechanism, comprising a plurality of paste-applying rolls, acommon paste receptacle having separate compartments for the respective rolls and a passageway therebetween, means for feeding a sheet to be pasted through said passageway and between said rolls, means for raising and lowering one of said rolls, and means for maintaining a substantially constant level of the paste in the other compartment.

7. In a paste-applying mechanism, the combination with a paste-holding receptacle, of a roll, timed means for raising and lowering said roll, and means for positively rotating said roll in one position of vertical adjustment, said means being inoperative in the other position of adjustment.

In testimony whereof I afiix my signature in presence of two witnesses.

HENRY C. HERB.

, Witnesses:

C. C.-MoRRIsoN, E. F. RrrENoUR.

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

Washington, D. G. v

Images