US3016074A

US3016074A - Log debarking machines

Info

Publication number: US3016074A
Application number: US735835A
Authority: US
Inventors: Robert M Baker; Norval K Morey
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-05-16
Filing date: 1958-05-16
Publication date: 1962-01-09
Anticipated expiration: 1979-01-09
Also published as: FR133798A; DE1199966B

Description

Jan. 9, 1962 R. M. BAKER ETAL 3,016,074

Los DEBARKING MACHINES 5 Sheets-Sheet 1 Filed May 16, 1958 01171K III AT TORNEYS Jan. 9, 1962 R. M. BAKER ETAL 3,016,074

LOG DEBARKING MACHINES Filed May 16, 1958 5 SheetsqSheel'. 2

INVENTOR. Nom/,4L K, MOREy BY ROBERT M. 6AM-cf? mf/I M www i ATTORNEYS Jan. 9, 1962 R. M. BAKER ETAL LOG DEBARKING MACHINES 5 Sheets-Sheet 3 Filed May 16, 1958 FIG. 5

NVENTOR. IVORY/1L K. /7 BY ,055,67 /Wf ATTORNEYS FIG. 4

Jan? 9, 1962 R. M. BAKER :TAL 3,016,074

LOG DEBARKING MACHINES 5 Sheets-Sheet 4 Filed May 16, 1958 myf \\\\\\\\n FIG. 6

ATTORNEYS Jan. 9, 1962 R. M. BAKER ETAL LOG DEBARKING MACHINES 5 Sheets-Sheet 5 Filed May 16, 1958 ATTORNEYS Patented Jan. 9, 1962 'hcc 3,016,974 LUG DEBARIGIIG MACHENES Robert M. Baker, Rte. 2, Morley, and Nerval K. Morey, Winn, Mich. Filed May 16, 1958, Ser. No. 735,835 2i) Claims. (Cl. 14e-298) This invention relates to improvements in bark removing machines for use in preparing logs or bolts for the pulp mill and pulping operations.

While various bark removing machines have been designed, much of the bark which must be removed prior to ythe commencement ofpulping operations is still removed by hand or by fluid under pressure in the mill after a considerable soaking and softening period because no really satisfactory machine has heretofore been available. Both of these methods of removing bark are slow and costly and designers have for some time sought to develop a machine which could process several cords of Wood per hour at a location in the forest removed from the mill. Most of the machines which have been proposed have been of the type which scrape or abrade the bark from the bolts or logs, and such machines have proven unsatisfactory in practice. in the winter time, when the logs are frozen, the bark cannot be scraped or peeled, and so, during the season when timber is most easily transported over the ground from relatively inaccessible locations in the forest, present machines are unsatisfactory, and the logs must be stock-piled for soaking, or the bark removed by hand with great ditliculty,

One of the prime objects of the instant invention is to provide a machine which removes the bark by chipping it from the log or bolt in a manner which is eflcient at any season of the year.

Another object of the invention is to provide a machine of the character described which incorporates means for moving a log in a spiral path and means driven independently therefrom for chipping the bark therefrom.

Still another object of the invention is to provide a machine which accommodates to the shape of the log automatically.

A further object of the invention is to provide a machine wh-ich with relatively slight adjustment can handle logs of greatly varying diameter.

Still another object of the invention is to provide a machine of compact and simple construction, which can be easily mounted on a trailer or the like and transported to central bolt receiving stations where the bark is removed, thereby eliminating the need for bark disposal apparatus and an expensive plant for receiving and removing the bark from the bolts.

A further object of the invention is to provide a simple and ecient machine which is economical to manufacture and assemble, which is light and durable in charaoter, and which can be readily instal'ed and moved about from place to place like a small trailer.

With the above and other objects in view, the present invention consists in the combination and arrangement of parts, hereinafter more fully described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims, it being understood that equivalent changes may be made in the various elements which comprise the invention Without departing from the spirit thereof, or the scope of the appended claims.

In the drawings:

FIGURE 1 is a side elevational view of the bark removing apparatus taken from the charge side thereof.

FIGURE 2 is a top plan view taken along the line 2q2 of FIGURE l.

FIGURE 3 is an enlarged, fragmentary top plan View taken on the section line 3-3 of FlGURB l.

FIGURE 4 is a fragmentary, front elevational view taken on the line 4 4 of FlGURE 3 and illustrating the longitudinal or axial rocking movement of the chipper cylinder frame.

FIGURE 5 is an enlarged, fragmentary, transverse sectional view showing the chipper cylinder in detail and illustrating the manner in which the depth 0f the chip is controlled.

FIGURE 6 is an enlarged, fragmentary, rear elevational view taken along the lines 6-6 of FIGURE 1.

FIGURE 7 is an enlarged, side elevational view of the means for controlling whipping of the log on the discharge side ofthe machine only.

FGURE 8 is a side elevational view showing the rearmost section of the chip removal auger.

FIGURE 9' is a fragmentary, elevational view of alternate means for adjusting the depth of chip which will be take FGURE 10 is a top plan view thereof.

Referring now more particularly to the accompanying drawings in which is shown a preferred embodiment of the invention only, a letter F generally indicates a longitudinally disposed frame which is shown supported on wheels W so that it can be drawn by an automobile or jeep, or the like, to various locations in the forest where logging operations are in progress. Any suitable trailer suspension system may be provided for the frame F and in the instant case depending members 10 are simply shown as supporting the axles 11 on which the wheels W revolve. v

At its front end the frame F is joined to a front frame section F having a tongue 12 thereon which can be secured to a trailer hitch provided on the draft vehicle in the usual manner. The frames F and F' can be constructed very simply of structural members welded together to provide strong and durable assemblies. In the instant case the frame F is shown as having

side frame members

13 and 14 joined by transversely disposed

members

15, 16, and 17 and the frame F is shown as having converging side members 18 joined by brace members 19. Securely fixed on frame member 16 is an upright supporting wall member 2t) which supports generally vertically arranged feed rolls or cylinders 2 and 22 in a manner to be presently described. The upper cylinder 21 is both vertically and rearwardly, or outwardly, spaced from the lower cylinder 22 so that a log `or bolt receiving nip is provided between them. (FGURE 1).

Logs are fed endwise into the nip between the rolls at the charge side of the machine, which is the right hand side of the machine when facing the forward end (FIG- URE l), and emerge with their bark removed at the discharge side of the machine. The rolls must be driven in the directions indicated by the arrows in FIGURE 1 if the log L is to be revolved in a clockwise path of revolution and the rolls must be skewed slightly as shown. The axis of roll 21 from its charge end is inclined downwardly from the horizontal atan angle of about 15 and outwardly at an angle of about 15 with relation to a truly transverse axis. The axis of the roll 22 is oppositely disposed from its charge end and inclined upwardly from this end at an angle of about 15 with respect to the horizontal and outwardly at an angle of about 7 with respect to a true transverse axis. Y

As shown in FGURES 'l and 2, the roll 21 which has protruding lugs or spikes 21a providing a gripping surface is rigidly fixed on a shaft 23 which is journalled in bearings 24 carried by a sub-frame 25 which has side frame members 26 connected by a brace member 27. The frame members 26, which are bent askew at their front ends as at 26a, are provided with tubular trunnions 2Gb,

the trunnions 26b being rotatably received in bearings 28 provided on a bearing plate 29 which is secured to the ventical support wall 20. As more clearly illustrated in FIGURE 6

openings

30 and 31 are provided in the wall through which the arms of the bearing plate 29 may project and the bearing plate 29 has arcuate slots 32 through which bolts 33, securing it in adjusted position on the support wall 20, may extend into any of a seriesof similarly arcuately arranged threaded` openings 34a provided in the wall 2G. The bolts 33 have enlarged washers 33a of greater diameter than the width of slots 32 so that the plate 29 may be securely held in any adjusted position. By means of loosening the bolts 33 and adjusting the position of bearing plate 29 slightly it will be clear that the tilt of roll or cylinder 21 in a vertical plane can be varied as desired. Y

The frame is supported in the position in which it is shown in FIGURE l by a pair of screw shafts 34 which extend through cooperatingly threaded openings 35 provided in a bracket arm 36 fixed to the frame wall 20. The screw shafts 34, which have handles H provided on their upper ends, extend freely through openings 27a provided in the brace 27 that freely pass the screw shafts 34, and. nuts 37 fixed on the shafts 34 support the frame V25. Provided on the screw shafts 34 are spring members 38 which bear on the brace 27 and are confined by the collar 39 fixed on screw shafts 34 so that they oppose upward swing of the frame 25. The springs 38 exert a considerable force suicient to maintain the roll 21 in driving engagement with the log L and cause it to revolve the log L under normal conditions. However, if the log should have an extremely large knot which the apparatus could not handle, which was inadvertently not removed prior to feeding the log into the machine, the frame 25 can be forced upwardly against the pressure of springs 38. Adjustment of screw shafts 34 by means of handles H controls the size of the nip between the rolls 21 and 22 and the handles H can be conveniently actuated when the size of the logs proceeding through the machine is varied to any considerable degree.

The roll 22Y which has spikes or lugs 22a is iixed on a shaft 40 journalled in bearings 41 provided on a bearing frame 42 wln'ch includes arms 42 having askew sections 42a and a front plate 43. Provided in the wall 20 to admit the arms 42 are openings 44 (FIGURE 6) and a central journal 45 pivotally secures plate 43 on wall 20. A connecting rod 46 connects the

frames

26 and 42 at one side by means of ball and socket joints 46a. If a log of considerably larger diameter than an immediately previous one is fed into the nip it will be desirable to decrease the spiral and speed of transverse feed of the log to avoid missing any areas of the log. If frame 26 lifts, then rod 46 pivots frame 42 slightly about pin 45 to decrease the tilt of roll 22. This automatically regulates the spiral travel of the larger log which because of its larger diameter would otherwise actually travel in a spiral path of increased diameter and at `an accordingly greater transverse rate. Because the connection of rod 46 is relatively close to the fulcrum of frame 26 the tilt of roll 22 changes only slightly with a considerably greater lift of roll 21 but, of course, proportionately. Thus, the tilt or angularity of the roll 22 is automatically varied as desired to produce, along with roll 21, the desired rate of travel of log L to accommodate to various sizes of logs.

Both rolls 21 and 22 are of the same diameter and are driven at approximately the same rate of speed by a gasoline powered, air cooled motor 47 in a manner which will now be described. The crank shaft 48 of the motor 47 has aV double pulley 49 thereon around which is trained a belt 50 leading to a pulley 51 of considerably larger diameter which is mounted on a shaft 52 carried in bearings 53 (FIGURE 6) on the front wall of frame wall 20. Keyed to the end of shaft 52 is a sprocket 54 which v drives vertically spaced sprockets 55 and 56 by meansof chain `57. Sprocket 55 is mounted on a shaft 58 supported by bearings 59 on therear face of wall 20 which is connected by means of a universal joint 60 to a shaft 61, supported in a bearing block 62 extending from the plate 29 through opening 30, which has a sprocket 63 mounted thereon. Shaft 61 extends'into position through the tubular trunnion 26a and drives a sprocket 64 keyed to roll shaft 23 by means of chain 65.

Sprocket 56 is mounted on a shaft 66 supported by a bearing 67 (FIGURE 6) on the front face of frame Vwall 20, and shaft 66 similarly thas a universal joint connection 68a with the shaft 68 supported by a bearing 69 extending from the plate 43 through openings 44. Provided on this shaft 68 is a sprocket 71 which drives the roll 22 through a sprocket 72 on shaft 40 around which chain 73 is trained. f

A sub-frame or chipper cylinder frame (FIGURES 3 5), referred to generally bythe numeral 74, is provided to support the chipper cylinder 75 on which are provided the rows of circumferentially spaced, generally radially projecting chipper cylinder teeth 76. The frame 74 is made up of side frame members 77 joined by end members 78 which have blocks 79 supporting trunnions 80. Provided on the main frame F, specifically on

members

15 and 16, are trunnion receiving bearings yS1 which support the frame 74 for rocking or pivotal movement in a transverse or axial plane on the main frame F. It will be seen that the blocks 79 are mounted of center on the end members 78 so that the forces of gravity will tend to revolve the frameA 74 in a clockwise direction as viewed in FIG- URE 4. Stops 82 fixed on the end frame member 15 of the main frame F extend forwardly out over the rockable sub-frame 74 and set screws 83 and 84 control the permissible travel or rotation of the frame 74. The screw S3 is adjusted as shown in FIGURE 4 so that the normal position of frame 74 is indicated by the diagrammatic lines c tilted downwardly from the horizontal at the charge side of the machine. The level position of the member 78 as when a straight orV linear portion of a log is proceeding between the rolls 21 and 22 is indicated at b in FEGURE 4 and another position is indicated at a as shown, the set screw S4 being adjusted to permit rocking movement of the frame 74 and its rear end member 78 downwardly to the position a if the shape of the log proceeding through the device warrants it. Ordinarily, of course, the frame 74 and members 78 will be in the position indicated at c in FIGURE 4 but it is to be understood that the shape of the log will dictate the rocking movement of frame 74 and accordingly of the chipper cylinder 75 which is keyed to a shaft S5 supported in bearings 86 on the side frame members 77. Arms 87 and y83 (FIGURE 5) having enlarged recesses 89 (FIG- URE 1) through which the chipper cylinder shaft 85 extends are provided on which the log L rests and are adjustable in a manner to determine the depth of chip taken by the chipper teeth 76. These

arms

87 and 88 are pivotally mounted on a tubular shaft 90 which is fixed between the side frame members 77. Fixed to the side members 77 rearwardly of the shaft 90 is a plate 91 which has depending set screws 92 which control the position of the upper peripheral surfaces of

arms

87 and 88. Arm 87 will be maintained at a slightly lower level than arm 88 in accordance with the depth of chip it is desired to take and the difference in height of the upper peripheral surfaces of

arms

87 and 88 will determine the depth of chip taken. The arm 87 at the charge side of the machine supports the portion of the log which has bark thereon while the arm 8S at the discharge side of the machine supports the peeled portion of the log. It will be seen that the chipper cylinder 75 is located under the nip between the rolls 21 and 22 and is driven in a clockwise direction as viewed in FIGURE l so that its tangential movement at log contacting points is generally opposite to that of the log L, the axis of rotation of chipper cylinder shaft being substantially in vertical alignment with the axis of rota.

tion of the log L as it proceeds spirally between rolls 21 and 22. When a lengthwise crook in the log reaches the rolls 21 and 22, the chipper cylinder 75 will automatically rock in an axial plane to accommodate to it and, since virtually every log to be processed has some lengthwise crooks and is not truly linear, provision of the frame 74 provides a machine which is truly practical. Relatively crooked logs have been elciently debarked with the instant machine and it has been found that the frame 74 readily rocks to accommodate to them.

It is highly desirable that the logs be fed up into the nip between rolls 21 `and 22 by the machine rather than by the operator and accordingly platform or plate member 93 which has spike members 93a thereon is fixed on the rockable platform 74 to extend under the charge end of the roll 2-1 at about the level of the upper periphery of the chipper cylinder 75. In this manner the operator need only rest the end of a log, which may be two and one half feet in diameter and twenty feet in length, on the platform 93 and the revolution of roll 21 will draw the log up between the cylinders 21 and 22 and start it spiraling before it comes into contact with the teeth 75 on chipper cylinder 75. The

guards

94 and 95 on the charge and discharge sides of the frame F respectively prevent whipping of such a log, the guard 94 being located on a log rest member 96 iixed on shafts 7 which extend outwardly from the frame F from sleeves 918 which accommodate them and the tubular, frustro-conical centering guide 95 on a frame member 193. A similar log rest 99 is provided on the discharge side of the frame and is iixed to shafts 196 which are accommodated in sleeves 1121 as shown. The sleeves 9S and 101 are welded or otherwise suitably secured to frame members 13 and 162 and

frame members

14 and 103 respectively. These log rests 96 and 99 which are slidably accommodated in the sleeves 98 and 191 respectively are removable during travel to and from the particular location in the forest where the debarking operations are to take place. It is important to realize that logs up to twenty feet in length can be processed by feeding them spirally endwise through the instant machine which has a frame only eight feet in width so -that it can travel safely down the highway behind an automotive vehicle.

A control bar B pivotally mounted on frame member 15 at 95a (FIGS. l and 7) provides the operator with additional leverage which can control whipping of the log at the discharge end.

The chipper cylinder 75 is also driven from the gasoline motor 47 but at a much higher rate of speed than are the rolls 21 and 22. Trained around the double pulley 49 is a second belt lil-l which leads to the pulley 105 mounted on the chipper cylinder shaft 85 (see F1Cr- URE 2).

Over a period of time if the apparatus remains in the same position piles of chips quickly build up as at 166 in FIGURE 1 and an auger or screw shaft 107 having iiights 168 thereon is provided to continuously move the chips out from under the frame F, the shaft 1137 extending rearwardly for some distance out beyond the rear frame member 15 (FIG. 8). The separate rear section 1G7a of shaft 107 is connected to shaft 167 by a universal joint 11371:, providing rotation of section 1ll7a about its own axis, and is supported in a bearing 1ii7c at its upper end by brace 197:1 extending from member 15. The provision of this auger shaft 167 will eliminate the need for moving the apparatus frequently and it will be seen that the shaft 107 can also be very simply driven from the motor 47 through a suitable speed reducer 169. Provided on shaft 52 which is driven by pulley Slis a sprocket 11() (FIGURE 6) which drives a sprocket 111 on the input reducer shaft 112 by means of a chain 113. The output shaft of the reducer 169 (FIGURE 2) has a sprocket 114 thereon driving a chain 115 which drives a sprocket 116 mounted on the auger shaft 107 which may be conveniently supported by bearings 117 as shown. The bearings 117 may be supported in any suitable manner from the frame F as by the depending members l@ and 118. In operation, the machine is easily transported to any suitable and even relatively inaccessible location in the forest where logging operations are in progress. It is preferably operated by two men; one man placing a log in position on the machine so that it Can be drawn into the mechanism and the other man removing the log from the machine after it has been debarked. Two men can easily debark more than three and one half cords per hour of hard, soft, green, dry, or frozen timber in diameters ranging from two and one half inches to sixteen inches and in lengths up to twenty feet, which'may be straight, curved, or crooked. lt is interesting to note that the machine is no wider than the average automotive vehicle and yet because it travels the log transversely it is capable or" handling logs of twenty or more feet in length. Further, the machine is low enough so that it will have no difficulty in traveling along forest trails. The operator at the charge side of the machine loads a transversely disposed log with its leading end resting on the platform 93 and with the log also resting on support 96, and then permits the roll 21 to roll the log forwardly into engagement in the nip between rolls 21 and 22. With the rolls 21 and 22 being revolved in opposite directions as shown, the log is given a spiral path of `revolution and is soon moved into a position above the cylinder 75. The depth of cut may vary from one half inch for hard wood such as oak to three thirty-seconds of an inch for cedar and the support arm S7 is initially set by adjusting the right hand set screw 92 to gauge the depth of the desired bite.

The chipping teeth 76 which may comprise cylindrical members with portions cut away to provide linear cutting edges 76a are disposed inl only slightly axially spaced rows on the cylinder 75 with the teeth being in staggered arrangement in adjacent rows as shown. The instant staggering arrangement will perform the chipping operation satisfactorily and take chips on the order of about a siX- teenth of an inch in width and depth and less than an inch in length. The speed of cylinder 75 will be very fast in comparison to the revolution of the continuously spiraling log so that a thorough job of debarking can be accomplished. For instance, the rolls 21 and 22 may be operating at a speed of about 30 r.p.m. and 38 rpm. respectively while the chipping cylinder 75 is operating at a speed of 251)() rpm. to 6000 r.p.m. With the teeth staggered in the manner indicated no more than a single tooth yis engaging the log at any one time and a gasoline motor on the order of 30 horsepower can be used as the motor 47, it being understood that the motor drives the rolls 21 and 22 and the auger shaft 107 as wellas the chipper cylinder 75'. The rolls 21 and 22 are pitched vertically in opposite directions from their charge ends so that they can spiral the log and they are also skewed with respect to a true transverse axis in view of the fact that they are vertically pitched. Whereas only a single upper roll 21 and a single lower roll 22 are shown, it should be clear that a pair of rolls 21 or a pair of rolls 22 in general axial alignment could have been used and separately driven.

Frequently a log will have a lengthwise crook or curve in it and when such a section reaches the cylinder 75, the frame 74 upon which it is mounted is able to tilt in a transverse plane about the trunnions Si) to accommodate to the log. It is important to note that the tilting of frame 74 to accommodate to the log tilts also the arms 87 and 8S and the member 93 which are carried on the frame 74. The

guides

94 and 95 are provided for safety purposes to prevent any whipping of the log in cases where the log might be quite crooked or bent. An added safety factor is the mounting of the frame 25 and roll 21 which it carries which can raise to pass a knot of unusual size which the teeth 76 might not be able to handle and which also api-aora Vthe shape of the log section proceeding over the cylinder 75. The rolls 21 and 22 furnish considerable support for the log which rests on arms S7 and 88 as it moves spirally across the machine and

arms

87 and 88 do not furnish the sole support for the weight of the log. Actually the

Varms

87 and 88 need not bear very much of the weight of the log.

Since the chips taken off build up quite rapidly, the auger shaft 16S renders it unnecessary to frequently move Vthe machine once it is in operation. While in FIGURE 1 the auger shaft is shown as broken olf it should be understood that it may extend more than six feet behind the frame member 15. Y

In FGURES 9 and 10 we have shown handle operi ated means for operating the chip depth gauge members 87 which in this case are fixed to a shaft 118 forwardly of chipper cylinder 75. A lever 119 also xed to shaft 118 carries a lug 12) which is accommodated in one of a series of notches 121 in a segment 122 in the usual manner of levers of this type. Member 23 pivoted at E24 to lever 119 connects to rod 12S to lift lug 126 when Y member 123 is depressed toward lever 119, the spring 126 normallyY maintaining lug 12B in one of the notches 121. This easy method of regulation provides a readily operable system for adjusting the depth of chip to be taken, as should beclear. Y

lt should be apparent that a thoroughly practical machine has been developed which can be readily moved about to desired locations in the woods and forest as deendwise from one side of said frame to the other; means Y chipping bark therefrom as said bolt progresses; an elongated screw member including a hinged section supported under said frame below said bark chippingy means Vand leading outwardly from said wheels and frame; Outrigger means on said frame for securing said hinged section in a raisedv position; and means connected with said motive drive means driving said screw member to remove the buildup of piles of removedmaterial from under the frame.

2. In bolt or log debarking apparatus; a wheeled frame supported above the ground having a vertical wall portion;

at least a pair of transversely disposed, generally vertically arranged cylinders with the upper cylinder spaced above and outward of the lower cylinder to define a log receiving nip therebetween; the upper cylinder being tilted slightly downwardly from its charge` end and the lower Y cylinder being tilted slightly upwardly from its charge end; an elongate depending frame pivotally mounted on the top end of said wall portion for supporting the upper cylinder; means securing the lower cylinder in position on said vertical wall portion; a sub-frame mounting a toothed chipper cylinder thereon; trunnion means extending transversely to the axis lof said chipper cylinder on said wheeled frame supporting said sub-frame for axial tilting movement in a plane parallel to the axis of said chipper cylinder when the latter is disposed in generally parallel, axial disposition relative to said cylinders under said nip; a support member on said sub-frame leading from outward of the upper cylinder in to the top of said chipper cylinder at the charge end of the cylinders and under the end portion of said upper cylinder but terminating short of said chipper cylinder; means for driving said upper and lower cylinders in the same directions to move a log in a path of revolution between them; the

upper cylinder being driven in a direction to feed a log on said support member in to said lower cylinder and chipper cylinder; and means driving said chipper cylinder so that its tangential movement at log contacting points is generally opposite to that of said log to chip bark from the log.

3. VThe combination defined in claim 2 in which one of said roll means has a peripheral gripping surface; and a spikedV surface platform extends from under said roll means with the spiked surface at a spaced distance therefrom in toward the bark removing member but terminates short thereof; the means driving said one of said roll means driving the roll means with the spiked surface in a direction of rotation such that the surface adjacent the platform moves toward the bark removing member in the direction of extent of said platform inwardly.

A.. The combination defined in claim 2 in which said shipper cylinder is mounted on a shaft extending from both ends thereof; log rest arms are provided pivotally mounted on said sub-frame frame and extend to opposite ends of said chipper cylinder, said arms having enlarged openings accommodating said shaft; and means are provided for locking said arms in particular positions of adjustment.

5. In log debarking apparatus; a pair of spaced apart rolls forming a nip between them; means driving said rolls in the same directions to move a log in a longitudinal path endwise between said rolls while revolving it; chipping teeth adjacent said nip; resilient means mounting one of said rolls permitting it to move in a direction away from said teeth and returning it to position, one of said rolls being movable away from the other; and means connecting said rolls varying the tilt of one of said rolls responsive to movement of the other, roll in a direction away from said first roll.

6. ln bolt debarking apparatus; a frame; a pair of generally axially parallel rolls mounted thereon in vertically and laterally spaced apart relation to define a nip between them; means driving at least the uppermost roll to revolve a log moving between the rolls in an axial direction; a tiltable sub-frame mounted by said frame bearing means with an axis transverse to the rolls mounting said subframe on said frame; bark removing means mounted on said subframeunder the nip between the'rols to tilt in an axial directiony when said subfrarne is tilted; log gripping means on said uppermost roll; Vsupport surface means on said subframe under said uppermost roll extending thereunder at a spaced distance therefrom; the means driving said uppermost roll driving it in a direction of rotationvsuch that Vthe peripheral surface thereofv passing adjacent said support surface means'is toward the nip and the bark removing means. i Y

7. The combination dened in claim 6 in which said uppermost roll is journaled on a frame membervpivotally mounted by said frame by a member whose axis is transverse to the said rolls.

8. In log debarking apparatus; a generally horizontally disposed base frame means; a generally horizontally disposed revolvable bark removal member; a generally horizontally disposed subframe mounting said bark removal member and tiltably supported by said base frame means for vertical tilting movements about a generally horizontal axis transverse to the bark removal member to provide axial tilting of the bark removal member; trunnions for said subframe supporting it ofIr center on said base frame means so that said bark removal member is initially in tilted position; generally vertically extending subframe means on said base frame means; a first generally horizontally disposed rotatable roll membr having an axis extending in a generally horizontal direction mounted on said vertically extending subframe means above said bark: removal member; a second generally horizontally disposed rotatable roll member having an axis extending in a generally horizontal direction mounted in spaced relation with said lirst roll'member and delining with it a nip adjacent said bark removal member; and means for driving said roll members to move said log endwise past said bark removal member.

9. ln log debarking apparatus; a generally horizontally disposed open frame means; a generally horizontally disposed frame received in substantially coplanar relation within said open frame means and tiltably supported by said frame means for vertical tilting movements about a generally horizontal axis; a revolvable bark removal member mounted by said frame to axially tilt vertically therewith; trunnion means at both ends of said frame extendin 7 transversely to the axis of said bark removal member and rotatably supporting said frame from said frame means; generally vertically extending subframe means on said frame means; a rst generally horizontally disposed rotatable roll member having an axis extending in a generally horizontal direction mounted on said subframe means above said bark removal member; a second generally horizontally disposed rotatable roll member having an axis extending in a generally horizontal direction mounted in spaced relation with said first roll member and defining with it a nip adjacent said bark removal member; and means for driving said roll members in the same direction to move said log endwise past said bark removal member.

l0. The combination defined in claim 9 in which stop plate means on one of said frame means and frame extends out to juxtaposed position with the other; and adinstable screw means are carried by said stop plate means in a position to engage said frame and limit tilting movements thereto. n

ll. ln a bolt debarking apparatus; longitudinally disposed frame means having a charge portion and a discharge portion; a vertically extending subframe supported by said frame means, means supported by said subframe on a side thereof for moving a bolt lengthwise while revolving it in a path of travel from the charge portion toward the discharge portion; said means comprising a set of opposite, rotatable roll members having axes extending in a generally horizontal direction; said roll members being spaced apart vertically to provide a nip between them and permit them to engage opposite sides of a bolt; one of said rotatable roll members being vertically inclined with respect to the other member; and a rotatable chipper cylinder mounted by said frame means generally axially parallel to said roll members and the path of travel of a bolt in the nip between them, and mounted coextensively with said roll members and adjacent the nip formed between them, said cylinder having circumferentially spaced, outwardly extending chip-l pers mounted thereon for chipping bark from a bolt moved endwise by said roll members; means for adjusting the relative positions of said roll members and chipper cylinder; means mounted by said frame means for driving said rotatable roll members in the same direction of rotation, said roll members being mounted on vertically spaced frames supported for tilting movement on said subframe; and means connecting said latter frames for movement in unison.

l2. ln a bolt debarking apparatus; longitudinally disposed frame means having a charge portion and a discharge portion; a vertically extending subframe supported by said frame means, means supported by said sub-frame on a side thereof for moving a bolt lengthwise while revolving it in a path of travel from the charge portion toward the discharge portion; said means comprising a set of opposite, rotatable roll members having axes extending in a generally horizontal direction; said roll members being spaced apart vertically to provide a nip between them and permit them to engage opposite sides of a bolt; one of said rotatable roll members being vertically inclined with respect to the other member; and a rotatable chipper cylinder mounted by said frame means generally axially parallel to said roll members and the path of travel of a bolt in the nip between them, and mounted coextensively with said roll members and adjacent the nip formed between them, said cylinder having circumferentially spaced, outwardly extending chippers mounted thereon for chipping bark from a bolt moved endwise by said roll members; means for adjusting the relative positions or" said roll members and chipper cylinder; means mounted by said frame means for driving said rotatable roll members in the same direction of rotation, said uppermost roll member being journaled by a frame member mounted for pivotal movement on said subframe, and said frame member being supported from said subframe by a screw shaft assembly permitting both adjustment of the vertical position of said subframe and free movement of said uppermost roll member upwardly; and resilient means opposing said upward movement.

13. The combination delined in claim l2 in which said screw shaft assembly includes a screw shaft supporting each end of said frame member, and each screw shaft has a threaded connection with nut means on said subframe and carries a plate on which said frame member rests; said resilient means comprising springs on each screw shaft between the plate and a stop on each screw shaft.

14. ln a log debarking apparatus, a generally horizontally disposed base frame means; a revolvable bark removal member mounted by said frame; generally vertically extending subframe means on said base frame means; a first generally horizontally disposed, rotatable roll member having an axis extending in a generally horizontal direction mounted on one side of said subframe means above said bark removal member; a second generally horizontally disposed, rotatable roll member having an axis extending in a generally horizontal direction mounted in spaced relation with said first roll member beneath it and delining with it a nip adjacent said bark removal member, said uppermost roll member being journaled by a frame member mounted for pivotal movement on said subframe and said frame member being supported from said subframe by a screw shaft assembly permitting both adjustment of the vertical position of said subframe and free movement of said uppermost roll member upwardly; resilient means opposing said upward movement; and power means connected to drive at least one of said roll members and moving said log endwise past said bark removal member.

l5. ln log debarking apparatus; main frame means; first generally horizontally disposed, rotatable roll means having an axis extending in a generally horizontal direction mounted by said main frame means; second generally horizontally disposed, rotatable roll means mounted by said main frame means having an axis extending in generally parallel but laterally spaced relation with said first roll means to deline a nip between them; a revolvable bark removal member, having generally radially projecting bark removing chipping teeth thereon, generally coextensively extending with said iirst and second roll means and having an axis generally parallel to said axes of the first and second roll means; subframe means journaling said revolvable bark removal member for rotation under said nip; bearing means having an axis transverse to the axis of said bark removal member fixed on said main frame means under said lirst and second roll means to support said bark removal member for transverse tilting movement in a vertical plane while otherwise fixing it from movement away from said main frame means; said bark removal member being supported under said nip so that the weight of the log aids to maintain the log in bark removing contact with the bark removal member during tilting of the bark removing member in a vertical plane; and means for driving at least one of said roll means to revolve said log and move it axially past said bark removal member.

16. The combination dened in claim l5 in which a spiegava rotatable shaft means is mounted by said subframe means a spaced distance outward from said bark removal member; and log support arms are provided on said shaft extending to opposite ends of said bark removal member and movable to an adjusted vertical position relative thereto to guage the depth of cut taken.

17. The combination defined in claim 16 in which said shaft is journaled by said frame, a lever is mounted by said Shaft to adjust said arms to various positions, and v means for holding said lever in predetermined position; one of said arms being ata different level than the other.

18. In log debai'king apparatus; a generally horizontally disposed main frame means; first generally horizontally disposed rotatable roll means having an axis extending in a generally horizontal direction mounted by said frame means; second generally horizontally disposed rotatable roll means having an axis extending in generally parallel but laterally spaced relation with said rst roll means to dene a nip between them; a revolvable bark removal member havingbark removing means thereon generally coextensively extending with said roll means and having an axis generally parallel to said axes of the roll means; subframe means journaling said revolvable bark removal member; means with an axis f extending transversely to said bark removal member 'f iixed on said main frame means under said nip supporting said subframe means and bark removal member for vertical, transverse tilting movement in a vertical plane while otherwise xing it from movement away from said main frame means; said bark removal member being supported under said nip so that the weight of the log aids to maintain the bark removal member in bark removing contact therewith during tilting of the bark removing member in a vertical plane; and means for driving at least one of said roll means to revolve said log and move it axially past said bark removal member. Y

19. In a log debarking apparatus, a generally horizontally disposed base frame means; a revolvable bark removal member mounted by said frame; generallyv verticallyextending subframe means' on said base frame means; a iirst generally horizontally disposed,A rotatable roll means having an axis extending in a generally horizontal direction mounted on one side of said subframe means above said bark removal member; a second lgenerally horizontally disposed, rotatable roll means having an axis extending in a generally horizontal direction mounted in spaced relation with said iirst roll means beneath it and deiining with it a nip above said bark removal member, said uppermost roll means being journaled bya frame member mounted for pivotal movement on said subframe; and said frame member being 1.2i biased downwardly toward said bark removal member by screw and spring means opposing upward movement oftsaid first roll means, said screw being adjustable to vary said spring force; and power means connected to drive at least one of said roll means and moving said log endwise past said bark removal member.

20. ln log debarking apparatus; base frame means; first generally horizontally disposed, rotatable roll means having an axis extending in a generally horizontal direction mounted by said base frame means; second generally horizontally disposed, rotatable roll means mounted by said base frame means having an axis extending in generally parallel but laterally spaced relationwith said first roll means to define a nip between them; a revolvable bark removal member having bark removing means thereon generally coextensively extending with said roll means and having an axis generally parallel to said axes o-f the first and second roll means; iirst bearing means journaling said revolvable bark removal member for rotation under said nip; second bearing means with axes transverse to said iirst bearing means iixed on said main frame means and carrying said first bearing means supporting said bark removal member for transverse tilting movement in a vertical plane while otherwise fixing it from movement away from said base frame means; said bark removal member being supported under said nip so that the weight of the log aids to maintain the log in bark removing contact with the bark removalmember during tilting of the bark removal member. in a vertical plane; and means for driving at least one of said roll means to revolve said log and move it axially past saidl bark removal member.

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