US989271A

US989271A - Machine for cutting chips for wood-pulp.

Info

Publication number: US989271A
Application number: US56344910A
Authority: US
Inventors: Nathaniel Lombard
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-05-24
Filing date: 1910-05-24
Publication date: 1911-04-11
Anticipated expiration: 1928-04-11

Description

N. LOMBARD. MACHINE FOR CUTTING CHIPS FOB WOOD PULP.

APPLICATION TILED HAY 24,1910.

989,271. Paigented Apr. 11, 1911.

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APPLIOATIOI IILBD MAY 24, 1910, 989,271 Patented Apr. 11, 1911-.

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MAOHINE FOR CUTTING CHIPS FOR WOOD PULP.

APPLICATION mum mu 24,1910.

989,271. Patented Apr.11,1911.

. H: I E o 0% g o o v I 39 E o o o o O I O 3 0' so "218 @f 5m mbwssw Inventor: (l /06AM & W N L-Lombardv @vmw by QmM NATHANIEL LOMBABD, 0F WINTHROP, MASSACHUSETTS.

MACHINE FOR CUTTING CHIPS FOR WOOD-PULP.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed May 24, 1910. Serial No. 563,449.

To all whom it may concern:

Be it known that I, NATHANIEL LoMBARn, a citizen of the United States of America, and a resident of Winthrop, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Machines for Cutting Chips for Wood Pulp, of which the following is a specification.

In the manufacture of Wood pulp the usual practice is to cut logs in proper lengths and put them into a fan-like hopper in which is mounted a plurality of small steel knives revolving at a high rate of speed. These knives quickly separate the logs into small chips which are carried away by means of a fan or other suction device to the digester where they are chemically treated to reduce the mass to pulp. This operation usually makes the chips of all lengths, some of which are very short and have no binding effect when formed into pulp, while the knives break off small pieces of wood and knots which have to be separated from the mass of chips prior to their entering the digester as they will not be properly acted upon by the chemicals to produce a suitable quality of pulp.

It has been found in practice that a very large proportion of pulp wood is wasted in this manner and the object of the present invention is to overcome this objection and utilize all of the wood and reduce the waste material to a minimum.

A further object of the invention is to cut the chips into lengths substantially the same so that when acted upon by the chemicals to produce a pulpy mass, the lengths of the fiber bein of substantially the same len h and unifbrm will have a binding effect that produces a very superior grade of paper of exceeding toughness.

To accomplish these objects the pulp wood is cut in the usual lengths and fed into a hopper smaller at the top than at the bottom, the bottom of the hopper being above a revoluble member having a plurality of chambers therein extending to the periphery of this revoluble member.

At the mouth of each chamber is secured a cutter blade, the cutting edge of which is slightly beyond the periphery of the revoluble member, this cutting edge extending transversely of the revoluble member and parallel to the grain of the wood in the hopper. Each cutter blade is provided with a plurality of equally spaced slots in each of which is a knife the cutting edge of which extends beyond the periphery of the revoluble member a distance equal to the distance of the cutting edge of the cutter blade beyond said periphery so that as the revoluble member revolves these knives will cut incisions through the grain of the wood upon the periphery of the logs and the cutting edge of the succeeding cutter blade will cut from the logs chips of equal length. By cutting the incisions into the surface of the logs and then chipping off from the surface of the logs by means of the cutter blade portions thus separated into equal lengths a superior pulp is secured which produces a high grade of this class of paper.

The invention consists 1n certain novel features of construction and arrangement of parts which will be readily understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents an elevation of an apparatus embodying the features of the present invention. Fig. 2 represents a transverse section of the same, the cutting plane being on line 22 on Fig. 1. Fig. 3 represents a sectional detail showing a portion of the revoluble member, a cutter blade thereon, and one of the knives for cutting the incisions into the surface of the logs. Fig. 4 represents a horizontal section of the same, the cutting plane being on line 4-4 on Fig. 2, and Fig. 5 represents a plan of a portion of the revoluble member showing the cutter blade and the plurality of knives in its rear edge.

Similar characters designate like parts throughout the several figures of the drawings.

In the drawings, 10 and 11 represent two side frames connected together by the

end frames

12 and 13. -These

side frames

10 and 11 have bearings 14 in which is mounted a revoluble shaft 15, to one end of which is secured a driving pulley 16. Between the

frames

10 and 11 the shaft 15 has mounted thereon and keyed thereto a revoluble member 17 provided with a plurality of openended transverse chambers 18 extending to the periphery of said revoluble member.

To the periphery of the revoluble member 17 are secured a plurality of cutter blades 19 by means of bolts 20, one for each chamber 18, the cutting edges of said cutter blades extending slightly beyond the periphery of said revoluble member. 19 substantially closes the opening through the periphery of the revoluble member communicating with the transverse chambers 18, there being ust suflicient opening in advance of the cutting edge to permit the chips cut from the logs to pass into said chambers.

Each cutter blade 19 has cut therethrough from its rear edge a plurality of slots 21 of greater depth at the bottom than at the top in each of which is mounted a knife 22, the cutting'edge 23 of which extends beyond the periphery of the revoluble member a distance slightly in excess of the distance the cutting edge 24 of the cutter blade is beyond said periphery. The slots 21 are equally spaced from each other and the cutting edges of the knives secured therein are at right angles to the cutting edge of the blade 19.

It is obvious from .an'inspection of the drawings that when the knives 22 are inserted in the slots 21 and the cutter blade 19 is secured by means of screws or bolts 20 to the revoluble member 17 said knives 22 are locked in position and cannot be a'ccidentally displaced. Secured to the upper part of the

frame

10 and 11 is a hopper 25 the upper and lower ends of which are open. The walls 26 of said hopper parallel to the shaft 15 incline upwardly toward each other, the purpose of these inclined walls being to resist any tendency of the cutter blades 19 from forcing upwardly the logs contained therein and being cut'by the various cutters and knives secured to the revoluble member as said member revolves in the direction of the arrow a on Fig. 2 of the drawings. A removable curved plate 27 is secured to the hopper 25 and the end frame 13. WVhen it is desired to remove the cutter blades 19 or the knives 22, access to the revoluble member may be secured by removing this cover 27. As the member 17 revolves in the direction of the arrow a the cutting edge 24 will shave from the under surface of the logs resting on the periphery of the member 17 portions of the surface thereof which portions will pass through the narrow opening 28 in advance of the blade 19 and into the chamber 18. As soon as the blade 19 passes from beneath a log and has chipped therefrom a certain portion of its surface the log by the weight of those above will be forced downwardly and as the member 17 continues to revolve the knives 22 will come into contact with the outer surface of the logs and cut transverse incisions therein, the next blade 19 cutting from this surface chips of equal length, these chips entering the chambers 18 as stated.

Opposite one end of the revoluble member 17 is a bonnet 29 which communicates by means of the pipe 30 with a suction fan or blower 31 driven by means of the pulley 32 and having an outlet 33, said blower being of Each cutter blade any well-known construction. During the operation of chipping the pulp wood the blower is driven at a high rate of speed sufficient to produce a suction that will draw from the chambers 18 the chips as fast as they are cut from the surface of the logs.

advantages of the invention will be fully understood from the foregoing.

Having thus described my invention, I claim: 7

1. In a machine of the class described, the combination of an open-ended hopper; a revoluble member beneath said hopper having a plurality of transverse chambers eX- tending therethrough from end to end and to its periphery; a peripheral cutter blade extending transversely of said member at the mouth of each chamber; and a suction member operable independently of said revoluble member communicating with one end of said chambers whereby the chips cut" from the material are drawn into said chambers and from one end thereof into a delivery tube 2. In a machine of the class described, the combination of an open-ended hopper; a revoluble member beneath said hopper hav ing a plurality of transverse chambers extending from end to end thereof and to its periphery; a peripheral cutter blade extending transversely of said member at the mouth of each chamber and having a plurality of slots extending inwardly from its rear face; a knife in each slot the cutting edge of which extends beyond the periphery of said cutter blade with its edge at right angles thereto; and a suction device communicating with one end of said chambers.

3. In a machine of the class described, the

combination of an open-ended hopper; a

revoluble member beneath said hopper havmg a plurality of transverse chambers extending to its periphery; a peripheral cutter blade extending transversely of said member at the mouth of each chamber and having a plurality of slots extending inwardly from its rear face, said slots being deeper at the bot-tom than at the top; a knife in each slot the body portion of which fits said slot while its cutting edge extends beyond the periphery of said member and at right angles to said cutter blade; and a suction device communicating with one end of said chambers.

4. In a machine of the class described, the combination of an open-ended hopper; a revoluble member beneath said hopper having a plurality of transverse chambers extending to its periphery; a peripheral cutter blade extending transversely of said member atthe mouth of each chamber, the cutting edge of Which extends slightly beyond the periphery of said member; a plurality of knives, the cutting edges of which are at right angles to and extend slightly beyond the cutting edges of said cutter blades; and a suction member communicating With one end of said chambers, whereby the chips cut by said blades and knives are drawn through said transverse chambers.

Signed by me at 4 Post Ofiice Sq., Boston, Mass, this 2d day of April, 1910.

NATHANIEL LOMBARD. Witnesses EDNA C. CLEVELAND, WALTER E. LOMBARI).

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.