US1962627A - Paper making machine - Google Patents

Description

June 1934- c. w. VALENTINE El AL 1,962,627

PAPER MAKING mourns Filed Dec. 9, 1931 fl/ INVEWN TOR5 fwd 407 W YW Z" l a 7 ATTORNEYS Patented June 12, 1934 PAPER MAKING MACHINE Charles W. Valentine, Watertown, and Napoleon Rigabar, Carthage, N. 31., assignors to The Bagley and Scwall Company, Watertown, N. Y., a corporation of New York Application December 9, 1931, Serial No. 579,834

3 Claims.

This invention relates generally to improvements in paper making machines and specifically to improvements in devices for transferring the Web from the paper making machine proper to the drying mechanism by which the moist paper web is dried.

In paper making machines of theFourdrinier type, for instance, the formed Web or sheet of paper is carried from the making wire to what is Iknown as a pair of press rolls by means of a traveling felt, and is taken from the press rolls to a series of heated dryer drums or cylinders by which the wet web is dried, and in this class of machines the wet Web of paper iscarried to the press rolls I by means of continuous traveling carriers, commonly known in the art as felts.

The web of paper as it comes from the press rolls is wet and is easily broken, and various devices have been suggested for transferring this wet web from the press rolls to the dryer cylinders.

Among these proposals is one in which there is provided a pick-up. or transfer flexible carrier, such as a felt, which takes the web from the first set of felts andcarries it to the dryer cylinder, the wet web of paper adhering to the under side of the pick-up or transfer felt. In constructions embodying this proposal, however, the transfer felt passes around certain guide rolls, which are so arranged as to cause a substantial wrap or lap {of the felt and the web carried thereby around the surface of the dryer cylinder. This construction has the disadvantage that the degree of pressure against the dryer depends upon the tightness or looseness of the felt, and further the substantial arc of contact frequently results in 1y no arc of contact between it and the dryer cylinder, the requisite pressure of the felt against the cylinder being obtained by an adjustable pressure roll to eifect the transfer of the wet web to the first dryer cylinder. A further object of the invention is to provide a construction of simple form which can be readily installed in a paper making machine and can be easily reached for repair and adjustment.

With these and other objects not specifically referred to in View, the invention consists in certain novel parts, arrangements and combinations which will be described in connection with the accornpanying drawing and the novel features pointed out in the claims hereunto annexed.

In the drawing,-

The figure is a side elevation, partly broken away, of a preferred construction, the paper making machine per so being omitted as unnecessary for an understanding of the invention. a

In the particular construction illustrated, there is shown the last pair of rolls, which are known in the art as press rolls, the upper one of these being marked 1 and the lower one 2, these rolls being suitably supported on shafts 3, 4 and driven in any suitable way, not illustrated. Passing between these press rolls are the regular felts 5, which form a continuous loop and travel in the direction of the arrows and act to carry, on their upper: surface, the wet web of paper coming from the machine, these felts passing .over suitable guide rolls, which, if desired, may be adjustable, two of which are shown, marked 6, 7.

Also passing between the press rolls 1, 2 is a flexible continuous traveling carrier in the form of a felt, this felt being termed the pick-up or transfer felt, marked 8. This felt is a continuous one and travels in the direction of the arrows and is driven by its contact with the'upper press r011. This pick-up or transfer felt acts to pick up the wet web of paper from the felt 5 and carries it to the first dryer cylinder 9 of the dryer section of the machine.

In accordance with the invention, means are provided for so guiding this felt that it engages with the cylinder 9 and on a line tangent to the surface of the cylinder, so that there is substantially no arc of contact between the felt and the cylinder, the necessary pressure being supplied as by a roll hereinafter referred to. To efiect this, therefore, the felt 8, after it leaves the roll 1, passes over a guide roll 10, suitably supported in standards 11 supported on suitable framing 12, it being understood that this construction is duplicated on the other side of the machine but is not shown. This guide roll 10, it will be observed, is so arranged relatively to the press roll 1 that the felt in its travel from the press roll to the guide roll passes in a straight line and touches the surface of the cylinder without any wrap or arc of contact. This construction is convenient, in that the press roll 1 is utilized as one of the guides for guiding the felt as described, but it will be understood, of course, that if desired other suitably arranged guide rolls may be employed.

The necessary pressure for taking the wet web off the felt onto the dryer cylinder is effected by the provision of a presser device, which acts to press the felt against the surface of the cylinder at the point at which the felt engages this so" i surface. This pressure therefore is controlled independently of any tightness or looseness of the felt and provides a very much more effective arrangement for transferring the wet paper sheet from the felt to the dryer surface than in the construction above referred to.

This presser means may be of any suitable character, but in the particular construction illustrated this is in the form of a roll 13 mounted in suitable bearings 14 supported in a bracket arm 15, in turn supported bythe standard 11, before referred to. In the construction shown, this roll, where a roll is used, is adjustable to and from the dryer cylinder 9, this adjustment being conveniently effected by means of a screw 16 and an operating hand-wheel 1'7. It will be seen that with this construction there is no substantial wrap of the felt about the dryer cylinder, and the presser means employed are entirely independent of the felt and the pressure is controlled independently of any tightness or looseness in the pick-up felt, resulting in a very effective transfer of the paper to the surface of the dryer cylinder.

The transfer or pick-up felt 8 is, as before stated, a continuous one, passing over guide rolls 18, 19, one of which may be adjustable if desired to adjust the tension of the felt, the felt also passing around another roll, not shown, and traveling continuously in the direction of the arrows.

After the web of paper W is transferred to the first dryer cylinder, it goes to the other dryer cylinders, one of which is shown, marked 20. The dryer cylinder 9 is, in the best constructions, mounted in anti-friction bearings so as to be freely rotatable and is driven by the, contact therewith of the transfer or pick-up felt 8, though, of course, if desired it may be driven in any other suitable manner.

While the invention has been shown and described in its preferred form, it will be understood that various changes may be made in the specific construction and arrangement of the parts and in the particular presser means employed, the construction illustrated being a preferred one, and changes and variations may be made in this construction without departing from the invention as defined in the appended claims.

What is claimed is:

1. In a paper making machine, the combination of a dryer cylinder, press rolls, means for forwarding a web from the machine to the press rolls, independent flexible transfer means for forwarding a paper web from the press rolls to the dryer cylinder and by which the cylinder is driven, guides on opposite sides of the cylinder for guiding the transfer means on a straight line tangent to the periphery of the dryer cylinder so that there is no substantial arc of contact between the transfer means and the surface of the cylinder, and adjustable presser means acting to press the transfer means against the cylinder at their point of contact.

2. In a paper making machine, the combination of a freely rotatable dryer cylinder, press rolls, a felt for forwarding a paper web from the machine to the press rolls, a second felt for transferring a web to the dryer cylinder and by which the cylinder is driven, guides for the transfer felt arranged to guide it on a straight line tangent to the periphery of the cylinder with substantially no arc of contact with the cylinder surface, and an adjustable presser roll pressing the transfer felt against the surface of the cylinder at its point of contact therewith.

3. In a paper making machine, the combination of a pair of press rolls, a felt running between the same for forwarding a paper web, a

"transfer felt engaging one of the press rolls and taking the web from the first felt, a freely rotatable dryer cylinder driven by the transfer felt, guiding means for the second felt arranged to guide the same at a tangent to the dryer cylinder so as to leave substantially no arc of contact, and an adjustable presser device independent of the second felt for pressing it against the cylinder.

CHARLES W. VALENTINE.

NAPOLEON RIGABAR.

Images