US565121A - Attachment for paper-making machines - Google Patents

Description

(No Model.)

B. RILEY. ATTACHMENT FOR PAPER. MAKING MACHINES.

No. 565,121. Patented Aug. 4, 1896.

UNITED STATES PATENT OFFICE.

EDIVIN RILEY, OF LIVERMORE FALLS, MAINE.

ATTACHMENT FOR PAPER-MAKING MACHINES.

SPECIFICATION forming part of Letters Patent No 565,121, dated August 4, 1896.

Application filed January 27, 1896. Serial No, 576,970. (No model.)

To aZZ whom it may concern.-

Be it known that I, EDWIN RILEY, a citizen of the United States, and a resident of Livermore Falls, in the county of Androscoggin and State of Maine, have invented a certain new and useful Improvement in Attachments for Paper-Making Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in paper-making machines; and it is designed particularly to be applied to fast-running Fourdrinier machines. In this class of machines, where the edge of the paper comes near the end of the press-roll, the water which is pressed from the felt has a tendency to travel along by the ends of the rolls on the edge of the felt, keeping it wet. This water works in onto the edge of the paper, making a wet edge, which consequentlyfills up the edge of the felt, causing the paper to break on the press-roll. This occurs most frequently in fast-running machines where time enough is not given for the water to run down over the face of the roll.

The object of my present invention is to remedy this defect and to provide means for keeping the expressed water back from the end of the lower roll and the edge of the felt. I accomplish this object by providing an airblast pipe connected with a suitable source of supply and having a nozzle directed inward against the edge of the lower press-roll immediately back of its point of contact with the felt, whereby the water pressed from the felt at or near the edge is blown constantlyinward and away from the edge of the felt.

I have illustrated my invention by means of the accompanying drawings, in which Figure 1 shows an end view of a press-roll housing of a Fourdriniermachine with my airblast pipe applied, and Fig. 2 is a section on the line w m of Fig. 1.

A represents the upper press-roll, and B is the lower press-roll; G, the felt; D, the paper,

and Gthe drip-pan under the lower press-roll. At each end of the lower press roll I provide an air-blast pipe II, connected with a suitable source of compressed-air supply and having a nozzle h, directed inward against the edge of the lower press-roll immediately in front of its point of contact with the felt, the edge of the felt being flush with the ends of the pressrolls.

The water which is pressed from the felt as it passes with the sheet of paper between the rolls runs down over the ascending face of the lower roll and falls in the drip-pan G underneath. That which is pressed out from the edge of the felt and at the end of the roll is blown inward by the air-jet and away from the edge of the felt, so that the latter passes through the rolls without carrying an excess of water, as it otherwise would.

The advantages of the improvement herein described are evident from what has been said. The wet edge, which is so troublesome on fast-running machine, is entirely done away with and the product of the machine is greatly improved. It is also made possible to run the machines at a higher rate of speed than could have been done before.

While my improvement is particularly adapted to be used on fast-running Fourdrinier machines, it may be used on any papermaking machine where this particular difficulty is experienced.

I claim The combination with the lower press-roll of a paper-making machine, of an air-blast pipe for directing a jet of air against the edge of said roll immediately in front of its point of contact with the felt whereby the water pressed from said felt is blown back from the edge.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

EDWIN RILEY. Witnesses:

FEED. E. RILEY, JOHN H. MAXWELL.

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