US138173A

US138173A - Improvement in suction apparatus for paper-machines

Info

Publication number: US138173A
Authority: US
Publication date: 1873-04-22
Anticipated expiration: 1890-04-22

Description

UNITED STATES PATENT OEEICE.

WILLIAM MCLAUGHLIN, OF LEE, MASSACHUSETTS.

IMPROVEMENT IN SUCTlON APPARATUS FOR PAPER-MACHINES.l

Specification forming part of Letters Patent No. 138,173, dated April `22, 1873; application filed l February 12, 1873.

T0 all whom it may concern:

Beit known that I, WILLIAM MGLAUGHLIN, of Lee, in the county of Berkshire and State of Massachusetts, have invented a new and Improved Suction Apparatus for Paper-Makling Machines; and I do hereby declare the Figure l represents a plan or top View ofV my invention. Fig. 2 is a transverse vertical section of the same.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of rollers in the suction-box of a paper-making machine, said rollers being made to revolve with the web carrying the sheet of paper, while the suction is taken between the rollers in such a manner that the web on moving over the suction-box is supported by said rollers, and as the rollers revolve with a super- Iicial velocity equal to the speed of the web, the motion of the web, as the same is depressed by the suction, is not materially impeded, and the partswhich support the web during its passage over the suction-box are not liable to wear out. Each ofthe web-supporting rollers moves in a box provided with packing, which can be pressed up against the circumference of its roller in such a manner that no air is allowed to pass into the suction-box on the sides of the rollers, and consequently the efect of the suction is not disturbed.

In the drawing, the letter A designates the suction-box of a paper-making machine, said suction-box being secured to the frame of the paper-making machine in the usual position, so that the web B, Fig. 2, passes over the same, and that the sheet of paper resting on said web is exposed to the suction during its passage over the suction-box. In the suctionbox I place two rollers, C' C, which revolve with a superficial Velocity equal to the speed of the web, and in the same direction in which the web moves, and which are so situated that by means of these set-screws and of the follower the packing can be pressed up against the surface of its roller with more or less power, and by these means the escape of air on the sides of the roller is prevented, and the effect of the suction is not disturbed. The suction takes place through au aperture, H, in the bottom of the suction-box between the two rollers C G, and the suction-box is adjusted to the width of the sheet of paper resting on the web by movable partitions I, such as are generally used in suction-boxes of papermaking machines, with that exception, however, that my movable partitions are adapted to the form of the rollers C (l.

In suction-boxes of the usual construction a perforated plate of sheet metal is secured on the top of the suction-box to support the web during its passage over the same, and as the suction draws the web down said web is depressed with great force on the perforated top plate of the suction-box, and thereby the motion of the web is impeded, and the perforated top plate is caused to wear out in a short time, while the web itself also wears.

By my moving supportin g-rollers the motion of the web is not impeded; and, furthermore, the rollers are not liable to wear, so that a considerable saving is effected by my invention.

If desired, three or more supporting-rollers might be used instead of two, as above described.

What I claim as new, and desire to secure