US951784A - Stave-sawing machine. - Google Patents

Description

' J. B. LUTTRELL.

STAVE SAWING- MACHINE. APPLICATION FILED DEO.31,1908.*

Patented Mar. 8, 1910.-

4 SHEETSSHEET 1 J. B. LUTTRELL. STAVB SAWING MACHINE.

APPLICATION FILED DBO.31.1908.

Patented Mar. 8, 1910.

4 SHEETSSHBET 2 J. B. LUTTRELL- STAVE SAWING MACHINE,

APPLICATION FILED DEO.31,1908.

95 1 7 Patented MarQ 8,1910.

4 SHEETS-SHEET 3.

J. B. LUTTRELLf STAVE SAWING MACHINE.

APPLICATION FILED DBO 31, 1908.

Patented Mar. 8, 1910.

4 SHEETS-SHEET 4 uarantor,-

UNITED srarns PATENT ra n.

' JOSEPH BENJAMEN LUTTRELL,

F LI'TTLE ROCK, ARKANSAS.

STAVE-SAWING MACHINE.

Specification of Letters latent.

Patented Mar. 8, 1910.

Application filed December 31, 1908. Serial No. 470.178.

To all whom it may concern: Be it known that I, JOSEPH B. LU'rTanLL, a citizen ot the United States, residing at 1 Little Rock, in the county of Pulaski and f vide an improved means forautomatically feeding;- the bolt to the saw and to provide an improved ejecting mechanism.

With the above and other objects in view, the invention. consists of the novel features of construction and the combination and arrangcnnait of parts hereinafter fully de- .scribed and claimed, and illustrated in the accompanying drawings, in which- Figure 1 1s a top plan view of a stave cutting or sawing machine constructed in accordance with the invention; Fig.- 2 is a front elevation of the machine; Fig. 3 is a rear elevation; F ig. 4 is a vertical cross section taken on the plane lndi rated by the line 4-4 in Fig. 1;,F1g'. is a detail cross section, the plane of which is indicated by the line in Fig. 1; Fig. 6 is a detail section showing a means for adjusting one of the shafts of the friction gearing; Fig. 7 1s a detail perspective of the I-shaped cross head or slide to which the work 'arriage is connected; Fig. 8 is a detail perspective of the ejector slide: and Fig. 9 is a similar view of the controlling lever and its pawl and ratchet locking means.

The, invention comprises a suitable sup porting frame or body here shown as eonsisting of a base 1 from which rises uprights 2 united by longitudinally curved or areshaped beams 3 which serve as supports for similar-shaped track railsi. TllOlJQtllTlS 3 or e uivalent support for the track rails project eyond one end of the frame to allow for the reciprocation of a work supporting carriage past a saw (5 upon a longitudinal shaft 7 journaled in suitable bearings8 on the upri hts2, The saw 6 is in the form '7 of the drawings.

of an or innry tubular saw secured by means of a ring 9 on a circular head it) fixed to said shaft, as shown-more clearly in Fig. 3 of the drawings. A belt wheel or pulleyv 11 1s fixed upon the projecting end of the shaft 7 for a suitable driving belt.

The reciproeatory or oscillatory carriage 5 which carries the block or bolt of wood B past the saw (3 may be of any suitable form and construction, but, as illustrated, it compriscs a platform 12 provided upon its bottom with banners t3 for the axles 14 of track wheels 13. The peripheries of the wheels 15 are grooved to engage the track-rails 4,

which latter are preferably V-shaped in cross-section, as shown. The hangers 13 are united by longitudinal tie rods 16 disposed beneath the platform .and the latter is connected by vertical bolts or tie rods 17 to an I- shaped slide or cross-head 18, shown more clearly in Fig. 7 of the drawings. Said cross head or slide 18 consists of a lonqitudinally curved connecting portion 1.9 with cross bars 20 at its ends and upon the top and bottom faces of the latter are bolted or otherwise secured, as at 21, plates 22, the ends of which latter pr 'ect beyond the ends of the. cross bars 20. 'lhe opposing inner faces of the beams 3 are grooved to form guide ribs 23 which enter the spaces between the projecting ends of the plates 22 and thereby slidably support the cross head or slidelS. The tie rods or standards 17 which unite the carriage. and said cross head are reinforced by crossed diaecnal brace rods 24 shown more clearly in Fig. 2 of the drawlngs.

The cross head or slide 18 1s reclprocated by a pitman 25, one end of which is pivoted V to a bearmg bracket 26 adpistably connected to said cross head and depcndin there from. The adjustable connection between the bracket 26 and the cross head 18 is preferably effected by forming said bracketwith a screw threaded stem 27 adapted to be inserted in anyone of a longitudinal series of vertical holes 28 formed in the connecting portion 19 of the cross head and to receive a retaining nut 29, as clearly shown in Fig.

pitman 25 is connected. to a wrist pin or pivot bolt 30 radially adjustable in a slot 31 formed in a crank wheel 32 fixed to a transverse shaft 33 journaled in suitable bearings 34. on the base 1. driven by variable speed gearing from a lo'ngitudinal countc shaft 35 which is in turn The other end of the The shaft 33 is 0' driven from the saw shaft 7 by means of a belt 36 passed around pulleys 37, 38 on the shafts 7, 35, respectively. The shaft 35 is journaled in suitable bearings 39 upon the base 1 and carriesa beveled friction wheel 40'which is slidably but nonrotatably mounted on said shaft by means of a longitudinal key 41. The longitudinal sliding movement of the wheel 40 permits it to be shifted toby means'of a shipper lever 43 pivoted at cured to one 0 one end to a bracket 44 and having itsintermediate portion loosely engaged with the hub of the wheel 40. The other end of the lever 43 is connectedby a link 45 to an arm 46 of a rock shaft 47, the connection between said link and arm being adjustable by fornn ing the arm with an eye 48 and the link with a'threaded end to enter said eye and providing clamping nuts on said threaded end upon oppositesides of the eye, as shown in F ig. 3.' The rock shaft 47 is disposed transversely and journaled in bearings 50 upon one end of the uprights 2 and to its front end is pivoted, as shown at 51, a locking arm or lever 52. The upper end of the latter is bent to provide a handle and car ries an integral pawl 53 which engages ratchet teeth 54 formed on the inner face of a U shaped the beams 3 and surrounds the lever 52, as clearly illustrated in the drawings. It will be seen that when said' lever 52 is swung inwardly .to disengage 'the pawl 53 from the ratchet teeth 54 the handle end of the lever ma be swunglongitudinally to rock the sha 't 47 and thereby oper ate the link 45to shift the wheel 40 toward or from the gear 42. n

Mounted on asupport 56' projecting from one of the uprights 2 is an adjustable gage plate 57. The latter is slidably mounted on said' support by forming it"withslots 58 to receive'clamping bolts 59. Saidgage plate 57 is adjusted toward and from the work carriage by means of 'serews'GOwhich are swiveled, as shown at 61, in ears 62 struck up from the gage plate, The intermediate portions of said screws Work. through stationary nuts 63 on the support and their inner extremities have milled heads by means of which they may be rotated to adjust'the gage plate when its astening bolts 59, are

' loosened.

The bolt B is supported on the carriage in a downwardly and inwardly inclined posi-- tion so that it will feed by gravity toward the gage 57 when it is released by the clampguide bracket 55which is se-.

ing device which holds it. on the carriage during the sawing operation. While any suitable, Work holding or clamping means I may be provided, the one'illustrated con sists of a stationary clamp member or jaw 64 and an oppositely disposed slidably mounted clamp member or jaw 65. Said clamp members are disposed on opposite sides of supporting ribs orstrips 66 fix to the platrorm'ot the carriage and havingtheir upper edges onwhich the bolt B rests, inclined downwardly and inwardly. While this is the, preferred manner ot slidably supporting the bolt, it will be understood that any other suitable means may be employed.v

The movable jaw or clamp 65 has a beveled base portionor slide 67 arranged for sliding movement in undercut guide strips 68 arr ranged longitudinally on the platform ofthe carriage. Said slide 67 is operated by a link 69 one end of which is pivoted to said which is pivoted, as at 71, to the upper portion of a vertically disposed trip lever 72'.

The latter is pivoted intermediate its ends i in a U-shaped bracket 73 on one end of the platform and has its lower end projecting slide, as shown at70, and the other end or into the pa'th'of an adjustable stop 74 carv ried by the beams "or supports 3; Said stop 74, as more clearly shown in Fig. l of the.

drawings, isin the form of a: longitudinally slotted plate made longitudinally adjustable with respect to the track by meansof a clamping bolt 75 arranged in its slot and in a cross bar uniting the two spaced beams 3. Themovable or sliding clamp 65 is spring actuated to its operative position against the bolt B, preferably, by means of a coil spring 76, one end of which is conneotedto the upper extremity of the trip lever, 72 and the V:

other end of .which is conneeted'to a'screw. 77 which is adjustable, bymeans of a hut 78*, in a bracket 7 9 fixed to the platformot' the carriage. By varying the tension of the spring 76 the clamping action of the v work clamp may be controlled so thatthe bolt will be roperly held between the two members of t e clamp. It'willbe seen that when the trip lever 72 is out of contact with the stop 74 the spring 76 will: actuate the movable clamp 65 so that the boltwill be held between the latter and thestationary Y clamp 64"and that when the carriage moves to the limit of its return movement torits,v

movement. away from the saw, the engage-- ment of the lower end of thetrip lever with the stop 74 will swing said trip lever to retract tlIQ-XIIOVZL'blG clamp 65 and hereby re lease the bolt B sothat it can slide down v. wardlypn its inolined support and engage the gage plate-57,,the adjustment of'which latter determines,the.t-hicknessi,or siae o'l' U the stave cut by theinaehine. 1 v

The strives, as they are cut by the drop into n receiving troughflO varranged upon one of the standards 2 adjacent to and beneath the saw. Said trough 80 is curved longitudinally and of substantially V-shape in cross section. The staves are automatically thrown out of said trough as fast as the gage 57 the thickness of the slaves may they drop into the same by an ejecting device eonsistii-ig of a scoop-like head twl which slides back and forth in a loi'lgitudiual direction in said trough and which is connected to one end of a rod- 32, the other end of which is pivoted at 8 to a bracket 8st pro ecting from the platforn'i of the car ria 'e Said ejector scoop head or slide 81 (Ulla s of a vertical portion to which the rod 52 is attached and an angular bottom portion 85 which conforms to the shape of the bottom of the trough 80 and slidably engages the same. This part 85 is'of' such lengt h that one end of the stave rests upon it when the stave drops into the trough, therebyeffectively pre venting the stave from being caught under the ejector head or slide.

To insure proper frictional contact between the beveled friction wheel 40 and the beveled wheel 42 and to permit the'wear of these parts to be compensated for. a se screw Ht; provided in a threaded end or cap 87 of one of the bearings 34 for the shaft The inner end of said screw 86 impinges against the end of said shaft 33 and is adapt ed to force said shaft longitudinally to cause the gear .42 to have a proper frictional contact with the wheel 40.

The operation of the invention is as follows. The carriage 5 is shifted to the outer end of the t- 'ack, as shownin Fig. 1, and the movable clamp (35 is retracted so that the bolt 13 may be placed upon its inclined sup porting strips 66 on the carriage and may slide down the same into contact with the gage 57. The movable clamp is then released so that the spring 76 will actuate it against the bolt and securely hold the same on the carriage. Power is then applied to the saw shaft 7 by means of a belt and the pulley 11 or any other suitable means so that the saw (3 will be rotated. The movement of the shaft 7 is imparted through the driving belt so to the shaft 35 and'from the latter through the friction gearing to the crank shaft 31-. As the latter rotates, the wrist pin 30 of the crank disk or wheel 32 will operate the pitman 525 and the latter will cause the reciprocation of the carriage. As the carriage moves the bolt past the saw a stave will be cut from the bolt and will drop into. the trough 30 and its ejector slide hl. which latter will throw the stave out of the trough when the carriage returns to its bolt slides downwardly by gravity into contact with the gage 57. The clamp 65 reengages the bolt the instant the trip lever 72 leaves the stop 74-. so that the bolt will be effectively clamped on the carriage while the next stave is being out. By adjusting he etl'ectively regulated and by adjusting the crank or wrist pin -30 in the wheel 32 and the pivot bracket Qtl of the pitman upon the cross head 18 of the carriage, the speed of the carriage and also the length of its stroke may be varied as may he found desirable or necessary. The speed of the carriage may also be controlled and the carriage may be thrown into and out of operation by manipulating and adjusting the lever 52, as above explained.

\Vhile the preferred embodiment of theinvention has been shown and described in detail, it Will be understood that various changes in the form, proportion, arrange ment; and details of construction may be resorted to without departing from the spirit of the invention.

Having thus described the invention What is claimed isf 1; In a stave sawing machine, the combination of a support comprising connected uprights, and'spaced connected guide bars supported on said uprights in horizontal po sition and curved longitudinally, the oppos ing inner faces of said bars having their upper and lower edges grooved longitudinally, track rails upon the upper faces of said guide bars, a reciprocatory slide consisting of a longitudinal bar, end cross bars, and upper and lower plates secured on said cross bars, the latter being disposed between the guide bars, and the ends of said upper and lower plates projecting into, and slidably arranged in, said grooves in the guide" bars, a carriage connected to said shde and having wheels to run upon said track rails, means for reciprocating said slide, a shaft mounted in suitable bearings on'said support, a tubular saw on said, shaft, and work supporting means on said carriage.

2. In a stave sawing machine, the combination of a support. comprising connected uprights and spaced connected guidebars supported on said uprights in horizontal position and curved longitudinally, the opposing inner faces of said bars having their upper and lower edges grooved longitudinally, track rails upon the upper faces of said guide bars, a reciprocatory slide con-.

sisting of a longitudinal bar, end cross bars, and upper and lower plates secured on said cross bars and having their ends projecting into and slidably arranged in said rooves in the guide bars, said longitudinal bar being formed with a longitudinal series of vertical openings, a bracket depending from the longitudinal bar and having a stem removably mot-ti ted in one of the openings in said longitudinal bar of the slide, a shaft carrying a crank disk, apitman connecting said crank disk to' said bracket, a carriage body,

upright bars unitingsa'id carriage body to said slide, grooved supporting Wheels beneath the carriage body to run on said track rails, a saw shaft mounted in bearings on said support, a tubular saw on the last mentioned shaft, and Work supporting means on said carriage.

3. In a stave sawing machine, the combinationiof a support comprising connected uprights and spaced connected. guide bars supported on the latter in horizontal position and curved longitudinally, theopposing inner faces of said bars having their upper edges grooved longitudinally, track rails upon the upper faces of said guide bars, a reci'procatory slide consisting ot a longitudinal bar, end cross bars, and upper and lower plates secured on said cross bars and having their ends projecting into and slidably arranged in said grooves on the guide bars, a

carriage connected to said slide and havingwheels to run upon said track rails, a horizontal shaft mounted in bearings on said uprights, a tubular saw fixed to said shaft and having a longitudinally curved side wall, a pair of parallel work supporting blocks arranged transversely on saidcarriage and having their upper edges inclined downwardly toward the saw, an upright stationary jaw fixed to one end of said carriage, parallel grooved guide strips upon the earriage, a slidable 321W having a base portion and a relatively stationary gage mounted on t r said support adjacent the saw.

In testimony whereof I hereunto afiix my I signature in the presence of two witnesses. Josnrn' BENJUIEN LUTTRELL. Witnesses: v

' B. B. VVADDLE, W. A. BAXLEY.

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