US693809A - Lumber-conveyer for double-cutting band-mills. - Google Patents

Description

No. 693,809. Patented Feb.-v I8, .l902.

E. E, THOMAS.

LUMBER CONVEYER FOR DOUBLE CUTTING BAND MILLS.

- (Application filed Aug. 20, 1901.)

(No Model.) 3 Sheets8heet l.

Edwin. E Thoma. s

No. 693.809. Patented Feb. l8, I902.

E. E. THOMAS. v LUMBER CONVEYE-R- FOR DOUBLE CUTTING BAND MILLS.

(Application filed Aug, 20, 1901. (No Model.)

3 Sheets-Sheet 2,

Edwin fiomaLs No. 693,809. Patented-Feb. I8, 1902;,

E. E. THOMAS.

LUMBER GUNVEYER FOR DOUBLE CUTTING BANB MILLS.

(Application filed Aug. 20, 1901.)

(No Model.)

3 Sheets-Sheet'3.

"Hl'l I In.

THE Nonms PETERS co PHOTO-LUNG.WASHXNGYOMP.C,-

llNTTnn STATES ATENT OFFICE.

EDWIN E. THOMAS, OF ST. PAUL, MINNESOTA, ASSIGNOR OF ONEHALF TO I UNION IRON WVORK S, OF MINNEAPOLIS, MINNESOTA.

LUMBER- -CONVEYER FOR DOUBLE-CUTTING BAND-MILLS.

SPECIFICATLON forming part of Letters Patent No. 693,809,dated February 18, 1902.

Application filed August 20, 1901- erial No. 72,649. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWIN E. THOMAS, of St. Paul, Ramsey county, Minnesota, have invented certain new and useful Improvements in Lumber Conveyors for Double Cutting Band-Mills, of which the following is a specification.

The invention relates to band-mills, particularly of the double-cutting type.

The lumber cut on the backward or return movement of a double-cutting band-mill carriage falls upon a conveyer located between the saw and the log-deck. This conveyer has in mills as now made a very slow speed compared with that of the carriage, and hence the carriage arrives at the point opposite the deck where the logs are delivered and is ready to receive another log before the last out of the preceding log has been taken away. As the slowly-movin g lumber extends along between the deck and carriage it has been necessary or desirable in mills as heretofore constructed to drop the conve-yer below the level of the deck and head-blocks and provide bridging means for the same, in order that the logs could be rolled from the deck to the carriage without waiting for the lumber to pass out from between them. This means has added considerably to the cost of operation of a mill; and the primary object of my invention is to dispense entirely with all bridging devices and provide means on which the lumber falls and upon which the logs may be rolled from the deck to the carriage as fast as they can be sawed.

The invention consists generally in providing one or more spiked live rolls between the band-saw and the log-deck.

Further, the invention consists in providing one or more idle skid-rolls between the deck and carriage and in line or running parallel with the log-skids.

Further, the invention consists in various constructions and combinations, all as hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a plan view of a double-cutting mill embodying my invention. Fig. 2 is an end view. Fig. 3 is a side elevation, the carriage, the track, and

supporting-timbers being, for the sake of clearness, omitted.

In the drawings, 2 represents a double-cutting band-mill; 3, the log-carriage; 4, the head-blocks; 5, the track, and b the log-skid, forming the upper portion of the log-deck. The deck and carriage are spaced from each other, as is customary in mills of this class.

In the space between the dock and the ends of the log-skids and the carriage I provide one or more skid-rolls 7, that are deac or idle and free to revolve either forward or backward in suitable bearings 8 in the logdeck and in a timber or timbers 9. These rolls 1 have shown substantially in line with the log-skids; but they may be parallel there with, if preferred, and their upper surfaces are substantially on a level with the tops of the log-skids and a little below the headblocks. These rolls being on substantially the same level as the deck and head-blocks have all the functions of the bridges in general use, in that they permit'the logs to be rolled by hand or other power directly from the deck to the carriage, and they possess, in addition, an advantage over the bridges, for they permit a log to be moved easily lengthwise to changeits position with respect to the carriage and are thus adapted for use with single as well as double cutting mills. 3etween the saw and the log-deck, parallel with the idle rolls 7 and substantially on the same level, I provide one or more spiked live rolls 10, mounted in bearings 11, supported on the timber 12, and preferably on the sawmill frame. The roll near the deck is provided with a sprocket 13, connected to a driven sprocket 14 by a suitable belt. (Indicated by dotted lines in Fig. 3.) The roll near the saw is also provided with a sprocket 15, that has a belt connection with a similar sprocket 16 on the live roll 17. (See dotted lines, Fig. 1.) This live roll is common to mills of this class and is driven, as usual, by the shaft-and-pinion mechanism 18. I prefer to drive the spiked rolls separately, so that there will be no intervening mechanism to interfere with the placing of the saw on the wheels or removing it therefrom.

19 represents live rolls of the usual construction located on the opposite side of the ICC saw from thelog and whereon the lumber falls that is cut on the forward movement of the carriage. The lumber as it is cut on the backward movement of the carriage falls upon the spiked and the idle rolls, and the spikes or spines of the former, digging into the lumber, will move itrapidly away, and said spiked rolls are driven at a sufliciently high speed to take away the two pieces made by the last out by the time the carriage reaches its loading position in front of the log-deck and before the log is started. I am thus able to keep the space in front of the deck clear of lumber and roll the logs oflf the deck upon the carriage by hand or other power as fast as one log is sawed and the carriage set to receive another without the use of bridge devices of any kind.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. Inaband-mill, the combination,with the saw, logdeck and carriage, of one or more idle rolls interposed upon stationary supports between the deck and carriage and on a level substantially with the top of the log-skids and the carriage head-blocks, and upon which the logs are rolled from the deck to the carriage, substantially as described.

2. In a double-cutting band-mill, the combination, with the saw, log-deck and carriage,

' of In mber-con veying means provided between said saw and deck, and whereon the lumber falls that is cut on the backward or return movement of thecarriage, and idle rolls provided upon stationary supports between said deck and carriage and on substantially the same level withsaid lumber-conveying means and thecarriage head-block, substantially as described and for the purpose speci- 3. In a. double-cutting band-mill, the combination, with the saw, log-deck and carriage, of one or more revolving spiked rolls provided between said saw and deck, idle rolls provided upon stationary supports between said deck and carriage, parallel with said spiked rolls, and said spiked and idle rolls being on a level substantially with the top of the headblocks and the log-skids, as described, and whereon the lumber falls that is cut on the return movement of the carriage, substantially as described.

4:. .In a double-cutting band-mill, the combination, with a saw, the log-deck and carriage,of a revolving spiked roll provided near said saw, a similar revolving roll. provided near the logdeck parallel with named roll, said rolls being 071 stantially with the log-deck head-blocks, idle rolls provile tionary supports between said carriage and forming a contir. :1 at Le log-skids and on substantially the same level therewith, and the carriage head Blocks and on which idle rolls the logs are r lled from the deck to the carriage, substantially as described.

5. In a double-cutting band-mill, the combination, with the saw, 1og-deck and carriage, oflumber-conveying means provided between said saw and deck and whereon the lumber falls that is cuton the backward or return movement of the carriage, and idle rolls provided between said deck and carriage and on substantially the same level with said lumber-conveying means and the carriage headblocks, said rolls serving as skids over which the logs are rolled from the deck to the carriage andas supports for the ends of the lumber that fall upon said lumber-conveying means, substantially as described.

In testimony whereof I have hereunto set my hand, this 16th day of August, 1901, at Minneapolis, Minnesota.

EDWIN E. THOMAS.

In presence of-' RICHARD PAUL, M. E. GooLnv.

Images