US635736A - Sand-table for paper-making machines. - Google Patents

Description

Patented Oct. 3!, I899.

J. H. ANNANDALE.

SAND TABLE FOB PAPER MAKING MACHINES.

(Application filed Dec. 20, 1897.)

(No Model.)

JAMES HUNTER ANNANDALE, OF POLTON, SCOTLAND.

SAND-TABLE FOR PAPER-'MAKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 635,736, dat d O t b 31, 1899.

Application filed December 20, 1897. Serial No. 662,713. (No model.)

To whom, it may concern:

Be it known that I, JAMES HUNTER ANNAN- DALE, paper manufacturer, of Polton Paper Works, Polton, Mid-Lothian, Scotland, have invented certain new and useful Improvements in Sand Tables or Traps for Paper- Making Machines, (which have been patented in Great Britain by Letters Patent dated December 11, 1895, No. 23,743,) of which the following is a specification. A

This invention has for its object the provision of improved means to facilitate the deposition or precipitation of sand and other particles of sedimentary foreign matter from paper-pulp on its passage from the beating- -engine to the strainer or before it passes onto the Wire of a paper-making machine. In the art of paper making stationary sand tables or boxes are at present used for this purpose and are provided with cross slats or bars to intercept the sedimentary matter which settles in these tables or boxes; but it is found in practice thata large percentage of such foreign matter is held in suspension by the pump while it remains in a clotted or flooculent state, and this is deposited on the strainer-plates or onto the wire of the paper-making machine, when owing to the vibratory motion imparted to the wire the pulp is brought to a more uniform consistency by disintegration of the clotted masses. The result is that the side of the paper adjacent to the wire contains the heavy sedimentary matter, while the upper surface contains the lighter loose floating particles. According to my invention I overcome this objection by passing the pulp through a sand table or box, to which a vibratory or jogging motion is imparted in a transverse or other direction by any mechanical means, such as by the use of levers or toggles operated by a rapidly-rotating crank or eccentric, which causes the breaking up of the clotted masses of the pulp before it passes onto the wire or at an earlier stage of the manufacture and insures the deposition of the sand and heavy foreign matter, as well as the more intimate mixing and better distribution of the component parts of the pulp.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal vertical section, Fig. 2 a cross-section, and Fig. 3 a plan, of a sand-table, showing one arrangement of devices for imparting vibratory motion to it.

The improved sand table comprises the usual trough or box A, into which the paperpulp is led by an inlet over the part A and thence flows over the table A toward the outlet end A The table, or the movable part of it, is supported upon an articulated framing composed of cross bars or beams B, carried by vertical rods B, jointed to them and to supports at B on the fioor. To the jointed supporting-frame B B, or to brackets B on the under side of the box A, are jointed the ends of links or connecting-rods 0, whose op posite ends are attached to cranks D or to eccentrics or cams on a rapidly-rotatin g shaft E, driven by a belt-pulley F or by other means. By the rotation of the shaft E oscillating or vibratory movem entisimparted to the articulated frame and to the sand-table supported on it, whereby the pulp passing through the trough A is kept in a state of tremor and the sedimentary matter in it is shaken down or precipitated on the table.

The mechanism for imparting oscillating movement to the sand-table may be varied in many ways, as may also be the direction of motion. Thejoggingorvibratorymotion may be applied at both ends or only at one end of the table, a pivot being in the latter case provided at the opposite end, so that jogging motion may be gradually reduced as the pulp flows on.

Instead of being supported from below the table may be suspended from above and the vibratory motion either imparted to the table or to the frame on which it is suspended, provided that such motion is transmitted to the table or to such part of it as will communicate the desired shake or tremor to the pulp.

The vibrating or oscillating sand-table is provided with the usual intercepting crossbars F or with cross-channels to receive the sedimentary deposit, and it is also by preference fitted with longitudinal division plates or boards G, which serve to better transmit the vibratory motion of the sides of the box to the mass of pulp flowing along the middle parts of the sand-table. At or near the outlet end a cross board or plate H dips into the pulp and forms a trap to skim and intercept floating foreign matter.

ICO

In lieu of vibrating or oscillating the sandof the cross-bars and above the same, said table as a whole the longitudinal divisionbars G leaving openings between their lower boards G or other part may alone be vibrated edges and the bottom of the table substanor oscillated. tially as described.

5 Having now described the invention, What Signed at Glasgow, in the county of Lan- 15 I claim, and desire to secure by Letters Patark, Scotland, this 1st day of December, 1897;

ent, is- JAMES HUNTER ANNANDALE.

In combination with the vibrating sand- Witnesses: table having cross-bars to form channels, the WALLACE FAIRWEATHER,

IO longitudinal bars Gr extending transversely J NO. ARMSTRONG, J r;

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