US1504248A - Lumber cut-off machine - Google Patents

Description

Aug 12 W2% 1,5@4,24@

C. JOHNSON LUMBER CUT-OFF MACHINE Filed April 5, 1922 2 Sheets-Sheet l I 1154mm C. JOH NSON I LUMBER CUT-OFF MACHINE Filed April 5, 1922' 2 Sheets-Sheet 2 lit Patented Aug. 12, W 24i.

CHARLES JOHNSON, 0F MINNEAPOLIS, MINNESOTA.

LUMBER GUT-OFF MACHINE.

Application filed April 5, 1922. Serial No. 549,669.

To all whom it may concern:

Be it known that ll, Crninnrs JormsoN, a citizenof the United States, residing at Minneapolis, in the county of Hennepi'n and State of Minnesota, have invented certain new and useful Improvements in Lumber Gut()if Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which is ap pertains to make and use the same.

My present invention provides a simple and highly efficient quickly adjustable board-stopping device especially adapted for use in connection with lumber cut-oft machines of the general type disclosed in my pending application Serial Number 469,731, filed May 14, 1921. The present invention is in the natureof a division of the said application in that it discloses and claims a lumber-stopping device, which, in a form modified as to details, is disclosed but not claimed, per se, in said pending application. The present form of the stopping device, in several respects, is an improvement on the form disclosed in my said prior application, but the generic principles involved in the two are the same.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a perspective showing the improved board-stopping device applied to a lumber cut-off machine of the type above indicated;

Fig. 2 is a detail in enlarged vertical sec tion taken approximately on the line 2-2 of Fig. 1;

Fig. 3 is a transverse vertical section taken approximately on the line 33 of Fig. 1;

Fig. 4: is a vertical section on the line 44 of Fig. 3; and i Fig. 5 is a vertical section on the line 5*5 of Fig. 3, some parts being broken away.

The numeral 6 indicates a table top supported by a framework 7, and the numeral 8 indicates a deck shown as provided with an angular board-guiding strip 9that is spaced from the adjacent edge of the table top 6 so as to leave a passage for the movement of power-driven circle saw 10. Said parts are of the usual or any suitable construction.

While the saw 10 is retractedor moved toward the left in respect to Fig. 1, the body to be sawed off will be placed on and guided by the angle bar 9 and pushed endwise over the table top 6, where it willbe intercepted and stopped by my improved board-stopping device now to be described.

The several parts of the board-stopping device are mounted directly or indirectly on an extension guide bar 11, preferably an angle iron, rigidly secured to the front edge of the table top daligned with the vertical flange of the guide bar 9, so that its vertical flange forms a continuation of the board guide extending past the saw. The numeral 12 indicates a horizontal guide rail that is secured to the vertical flange of the extension guide bar 11 by studs 12.

The numeral 13 indicates a rectangular rock shaft located above. and extended parallel to the guide rail 12 and jour'nal'ed' in end bearing brackets 14L and 15, bolted or otherwise rigidly secured to and upstanding from the ends of said guide rail. This rock shaft 13, at that end nearest to the saw, is provided with an operating handle lfi that co-operates with the notched flange 17 of a lock segment 18 that is formed integral with the end bracket 14. The numeral 19 indicates a coiled spring placed around the shaft 13 and compressed between the segment- 18 and a collar 20, which latter is adjustably secured on said shaft. The spring 19 will yieldingly hold the lever 16 engaged with any one of three notches '21 formed in the flange 18, and for a purpose which will presently appear.

The rock shaft 13 operates a plurality of stop devices. As shown, there are three of these stop devices, two of which are arranged to be progressively moved by the rock shaft 13 and the third of which remains normally in an operative position. These stop de vices 22, 23 and 24 are designated as first, second and third'sto-p devices when noted from the left toward the rightin respect to Fig. 1, or from the right towardthe left-in respect to Fig. 3. b These stop devices are in the form of L shaped arms having downturned ends adapted to rest upon the table top 6 and having hubs that surround the rock shaft 13 and are pivotal'ly attached by tubular screws 25 to upstanding lugs of bean ing blocks or heads 26 that are arranged to slide on the guide rail 12. As shown, the

bearing blocks 26 are provided with angular bushings 26 thatdirectly engage the rail 12 and are open at one side in line with openings in the same side of the blocks 26, to clear the studs 12*. The bearing blocks 26 are provided with clamping screws 27 that work with threaded engagement through the front side thereof and press short loose plungers 28 against the rail;12 to securely hold said blocks in their different adjustments or positions longitudinally of said rails 'Q'Thetubular screws clear the angular rock. shaft 13 so that oscillatory movements ofuthelatter; do not oscillate said screws.

The'th'ird stop arm 24 will always. be grav ity-held in an operative position. The first stop arm 22, (see particularly Fig. 4.), is

provided with a flat metal clip 29 that is secured thereto by aset screw 30 and is I provided with an angular perforation that quiteclosely fits the angular cross-section of therock shaft 13, so that this first arm 22 will partake of all of the oscillatory movements of said rock shaft. stop arm 23 is provided with a quite similar-clip 31 that also has: an angular perforation quite closely fitting the shaft 13, but this clip 13 has a. segmental slot 32, and a screw 33 works through this slot and is screwed into the stop arm 23. The slot 31 permits the rock shaft 13 to be given sufficient movement to first raise the stop arm 221:0, an inoperative position, while the stop *arm'r23 remainsin an operative position,

but further movement of said rock shaft w-ill then raise said second stop arm 23 abof-ve its-operative position.

JI-n the foregoing description, it is evident thatjthe'several stop arms 22, 23 and 24:

, stopped by the first stop arm 22 so that the lumber will then be cut to the shortest length I for which the stop device is then set. When the arm 16 is moved toward the left in re spect to Figs. 1 and 2, into engagement with the second notch 21, the first stop arm 22 will be raised above the line of movement of the board or, otherwise stated, into an inoperative position, leaving the second stop-arm 23 still in its operative position. When the arm 16 is moved further toward the left into engagement with the third 'net ch 2 1, as shown in F'ig. 2, said second The second stop arm 23 will be raised to an inoperative posit-ion, leaving only the thirdstop arm 24in operative position. This last noted movement, of course, moves the first stop arm 22 to a still higher position, but in the position just above noted, the boa rd will be fed through until it engages the third stop 24.

From the foregoing, it will be evident that, normally, all 'of the stop arms are in operative position and that, by movements of the rock shaft, the several stop devices, in a direction away from the saw, are progressively picked up or moved into inoperative positions. Under oscillatory movement of the rock shaft in a direction reverse to that above noted, the stop arm 23 will first be lowered to operative position and then the stop arm 22 will be brought down to operative position. Hence, by oscillatory movements of the lever 16, the operator can very quickly render operative any one of the several stop devices. This quickness of action is highly important because the operator must quickly determine the length into which it is advisable to cut the board as the board is fed to position in front of the saw and then must act quickly in the selection of the proper stop.

From the principles of construction and arrangement described, it is evident that any desired number of stop arms may be operated by the common rock shaft, in which case the clips for connecting the stop arms to the shaft would have slots of progressively increasing circumferential extent. These clips afford a very convenient means for effecting such connections, but the .in

vention involves, broadly, the broader idea of having the progressively movable stop arms connected to the shaft by means of correspondingly varying slack motion couplings or devices, regardless of the exact nature thereof. Hence, it will be understood that the mechanism or device herein described is capable of very considerable modification within the scope of my invention.

Attention may be further called to the important fact that in this improved board stopping device, the stop arms are supported above the table, moved downward toward the table into operative positions and up ward from the table into inoperative posi tions, and hence, are entirely independent of the table and do not require openings in the table, such as would be required if the said stop arms were arranged to move upward through the table.

What I claim is:

1. The combination with a saw table, a cooperating saw and a board guide on said table, of a board-stopping device comprising a rock shaft mounted in bearings fixed in 7 respect to said board guide, a rail. extended Ill 1,504,2as g3 parallel to and secured in respect to said board guide, bearing blocks slidably mounted on said rail, stop arms that are free for difi erential oscillations on said shaft and have hubs connected to said rock shaft by couplings that cause said arms to move with said rock shaft progressively from and to operative positions, and means for securing said bearing blocks to said rail in different set positions as to distance from said saw.

2. The structure defined in claim 1 in which the connection between said shaft and stop arms is made by clips all of which oscillate with said rock shaft and are connected to the respective stop arms by screws and screw passages that permit variable movements of said rock shaft w ithout operating said stop arms.

3. The structure defined in claim 1 in which said stop arms are approximately l.- shaped and the hubs of which are pivotally attached to said bearing blocks by tubular screws that loosely surround said rock shaft.

lln testimony whereof l aflix my signature,

CHARLES JOHNSON.

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