US231579A - holloway - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

G. HOLLOWAY. Felt Cleaning Apparatus for Paper Machines.

No. 231,579. Patented Aug. 24,1880.

WITNESSES:

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UNITED STATES PATENT OFFICE.

GEORGE HOLLOWVAY, OF OHARTHAM, NEAR CANTERBURY, ENGLAND.

FELT-CLEANING APPARATUS FOR PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent No. 231,579, dated August 24, 1880.

Application filed July 13,1880. (No model.) Patented in England Auguiit 1, 1878.

To all whom it may concern:

Be itknown that I, GEORGE HOLLOWAY, of Ghartham, near Canterbury, in the county of Kent, in England, have invented certain new and useful Improvements in Felt-Cleanin g Apparatus for Paper-Making Machines, of which the following is a specification.

In the accompanying drawings, Figure 1 is a side elevation of that part of a paper-making machine involving the first and second felts, and Fig. 2 is a vertical longitudinal section of such moving parts as pertain to the first or wet felt.

My improvements are embodied in both figures.

In both figures of the drawings, A is the top roll, and B the bottom roll, of the first press, and the continuous line of fine dots represents the first or wet felt. These parts are as usually constructed.

Upon the back of the bottom press-roll,B, I arrange an arresting and con veying ductor, D, to arrest and convey away the water and other matter expressed by the two press-rolls A and B as the soft and wet web is carried between them. The ductor 1) consists of a journaled trough arranged to receive the liquid and other matters arrested by the rubber I, which bears against the bottom press-roll, B, and discharge them at the pipe J, whence such portions as are to be reused may be led away, as desired, and the other portions led to waste-drains. The liquid matters, &c., are by this arrangement prevented from falling upon and fouling the lower or returning side of the felt.

The rubber I may be of any character adapted to arrest the back flow of the eX- pressed matter and deliver the same into the conducting-trough I); but I find in practice that the best results are attained by the use of a rubber shaped substantially as shown, and having a taut apron, M, of woven fabric, like felting or old couch jacket, bearing tangentially upon the roll at a point below the edge of the rubber I. This allows the fabric apron M to find an elastic bearing against the roll.

I wash the felt continuously while the machine is in use by means of jet-pipes E and F. The pipe F discharges its water, hot or cold, against and through the felt, and thus urges the contained deposits to the bottom side of the felt. The jets E, brushing the felt, remove the loosened deposits and leave the felt clean. After being thus washed the felt is pressed dry, or sufficiently so, between the bottom press-roll, B, and the wringing-roll O, which bears against the roll B and is driven by frictional contact with it, the felt of course intervening.

Any suitable means for regulating the press ure may be employed to press the wringingroll 0 upward. By thus placing the wringingroll 0 under the press-roll B the latter is caused to do double duty as bottom press-roll and top wringing-roll. The roll B may be relieved of its duties as a wringing-roll by placing a pair of wringing-rolls at any proper point and running the cleansed felt between them. Sucha pair of rolls would need to be revolved at proper speed by power, and therefore I much prefer to utilize the roll B as one of my wringingmolls. The apron M of the ductor arrests any liquid which might tend to be carried upward by the roll B.

Instead of the brushing-jets E a trough of cleansing-water may be placed under the roll G to remove the matters from the felt. In such case the roll G must, by the addition of other felt-supportin g rolls in an obvious manner, be caused to revolve with some part of its surface below the surface of the water in such cleansing-trough. The felt is to be supported when necessary, and its direction altered when necessary, by means of idle-rolls N, as is common in this class of machinery.

The water or liquid used in the washing of the felt may be such as circumstances or practice suggest. Practice will also suggest the amount and pressure of water required.

The apparatus has been in successful practical use, and it is found that by its aid felts can be run continuously for months and be always clean and in nice condition.

I claim as my inventionl. The combination, with the bottom pressroll, of a ductor arranged to bear against the back of said roll and adapted to arrest and convey away clear of the felt such matters as may be expressed from the paper and felt pressed between the bottom and top pressrolls, substantially as set forth.

2. In an arresting;- and conveying doctor, the combination, with a rewiring-trough having an outlet, of a rubber and a taut fabric apron, substantially as set forth.

3. The combination, with a jetted Waterpipe arranged and adapted to force contained deposits through the felt, of a pair of wringing-rolls adapted to express the cleansing- Water from the felt, substantially as set forth.

4. The combination, with a pair of wringing-rolls and a jetted waterpipe adapted to force contained deposits through the felt, of a jetted water-pipe arranged so thatits jets may brush the outer surface of the felt, substan' tially as set forth.

5. The combination, with felt-washingjets, of a wringing-roll arranged beneath and adapted to be driven by the bottom press-roll, sub-

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