US3286743A - Automatic continuous-cutting rotary log feeder for band-sawing mills - Google Patents

Description

N 1966 SUEKICHI YUMINO 3, 86,7 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 1 177/97 S148 6/2/71 um 7 Nov. 1966 SUEKICHI YUM|NO 3, ,7 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 2 ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6 Sheets-Sheet 3 Filed Dec. 4, 1963 I l I v- 1966 SUEKICHI YUMINO 3,286,743

AUTOMATIC commuous-cumme ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 4 ATTORNEYS v Nov, 22, 1966 SUEKICHI YUMINO 3,286,743.

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6 Sheets-$heet 5 Filed Dec. 4, 1963 J m e277?)- Su 124 114) M 777 7: PM 977W ATTORNEYS NOV. 1956 SUEKICHI YUMINO 3,286,743 AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4'. 1963 16 Sheets-Sheet s 31 e 191 0. 1' ya 271/770 a; WW flaw mm M ATTORNEYS N 1966 SUEKICHI YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 7 ATTORNEYS N v- 22, 1966 SUEKICHI YUMINO 3,

I AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6 Sheets-Sheet 8 Filed D60. 4, 1963 5 u e kI C/Z/ /W/Wo ATTORNEYS Nov. 22, 1966 sun-:mcm YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 9 A ATTORNEYS 2, 1966 SUEKICHI YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BANDSAWING MILLS l6 Sheets-Sheet 10 Filed Dec. 4, 1963 w m mm w MW J w a b L a 5 Nov. 22, 1966 Filed Dec. 4, 1963 SUEKICHI YUMINO AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Fig. /2

16 Sheets-Sheet 11 JUL I 0 IO E ATTORNEY 1966 SUEKICHI YUMINO 3, 6, 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 l6 Sheets-Sheet 12 Sue f/a/z/ J u 777/71 0 25w: him WW ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 13 ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6 Sheets-Sheet 14 Fig. 20

l'm'enjbr w/n Mm KW Z/QZ Y%/MZ24/ ATTORNEY$ Nov. 22, 1966 SUEKICHI YUMINO 3, ,7 3

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS Filed Dec. 4, 1963 16 Sheets-Sheet 15 I 294 Fig. /8

W 29/ J HHHHHH l llllllll l MW ATTORNEYS Nov. 22, 1966 SUEKICHI YUMINO 3,286,743

AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FOR BAND-SAWING MILLS l6 Sheets-Sheet 16 Filed Dec. 4, 1963 ATTORNEYS United States Patent Ot'tiee 3,286,743 AUTOMATIC CONTINUOUS-CUTTING ROTARY LOG FEEDER FORBAND-SAWING MILLS Suekichi Yumino, 2 Nishi-6-ch0me, Kita-S-jo,

Sapporo-ski, Japan FiledDec. 4,1963, Ser. No. 327,969 Claims priority, application Japan, Dec. 8, 1962, d

Claims. (Cl. 143-105) This inventionrelates to log feeders for band-sawing mills and to those of the rotary type which are adapted for automatic continuous operation and includes a substantially circular chuck wheel rotatable ina vertical plane and adapted to carry a number of logs on the periphery to feed them successively through a band-sawing machine for production of boards.

In previous lumber mills, logs have generally been placed on a horizontally reciprocable carriage, positioned to extend beyond the carriage deck by a distance corresponding to the desired board thickness and advanced through the band saw to sawoff a board of the desired thickness. The carriage has subsequently been moved away from the band sa-w by means of a backing device to avoid danger until it is retracted to its initial position when the log is again positioned by the setting device for the next sawing cycle. This sequence has been repeated as required. 'As will be apparent, the conventional lumbering process has included various forms of loss in time, such as the time for back stroke of the reciprocable carriage, time for the carriage to be retracted by the backing device to avoid engagement of the log with the band saw, time for advancing the carriage to its cutting position after it has been restored to its initial position, time for ,operation of the setter during which time the band sa-w must idle, and additional cutting time for acceleration and deceleration of the carriage to and from the cutting speed required at each end of its reciprocatory movement.

Another difiicultyinvolved in conventional log feeders comes from the fact that the log carriage is mounted for reciprocation on a number of wheels adapted to run over a pair of track rails, which are in point contact with the wheels. With such arrangments, a curved cut has often resulted from some wrongness of the rail arrangement, intervention of some sawdust between the rails and wheels, wheel racing, etc. t

,Heretofore, accurate log positioning on the carriage has been rather difiicult. As .is well known, the backing device on conventional log carriages has included .a

screw-threaded element which is rotatable with rotation of the carriage wheels and the stop position of the element has provided the reference for log positioning. Therefore, the positioning accuracy hasoften been reduced by variation in magnitude of the rotating mass. of the threaded element. In addition, it has-been diflicult to obtain a uniform setting since both static and dynamic frictions inevitably take partsin the setting operation, which necessitates stopping of the carriage at each reciprocation thereof for operation of the setter, and, once a log is erroneously positioned to extend excessively beyond the carriage deck, correction of the log setting has been extremely difiicult even by use of a magnifying lens, compelling the sawyer to work on such more or less inaccurate settings. p I y Accordingly, a primary object of the present invention is to provide a novel rotary log feeder which does not rely for cutting feed upon the forward stroke motion of a horizontally reciprocable carriage as employed previously but is adapted to rotate logs on a stationary frame in a vertical planefor continuous cutting operation, thereby eleminating any idling of the band saw as required during reciprocation of the wheeled carriage and increase in Patented Nov. 212, 1966 cut-ting time due to acceleration and deceleration of such carriage required at each end of its reciprocatory movement, while at the same time avoiding various difiiculties often resulting from the point contact between the carriage wheels and rails, as described above.

Another important object of the present invention is to provide a novel automatic continuous log feeder which includes a setter or positioning device operable upon the basis of the advance of a threaded element to ensure smooth and accurate log positioning and which eliminates the need of ceasing the cutting motion for log setting at the expense of cutting time. i

A further object of the present invention is to provide a novel type t of log feeder which dispenses with any backing device and hence is free from loss of time previously unavoidable to retract the wheel carriage from the band saw by the backing device and also from occurrence ofany curved out due to variation in inertia of the rotating. mass of the threaded element in the backing device, which has previously been restored to for reference in the setting operation.

According to the present invention a log feeder is provided which includes a carriage having a plurality of wheels mounted on a pair of rails for travelling thereover and appropriate bearing brackets mounted on the carriage rotatably to support a main shaft, on which a substantially circular chuck wheel is mounted fast for rotation in a vertical plane. A number of logs are mounted on the chuck wheel and advanced through a band saw. Also mounted on the carriage is a gear transmission mechanism including a main feed gear box and a differential gear box for continuously advancing the chuck wheel with logs mount-,

ed to be cut thereon. i

Experiments have revealed that with the apparatus of the present invention practically no alternation of loaded and unloaded states occurs and the cutting force remains uniform to give an enhancedsawing efliciency. Also int-o boards of different thicknesses and in one preferred embodiment, which will be described in detail herein-' after, six switching handles are provided to give asmany as forty thickness settings.

One important advantage of the present invention is that it renders it possible to apply a band saw to sawing lumber 1 for pencil use with production efficiency surprisingly increased.

The present invention will now be described in further detail with reference to the accompanying drawings, which illustrate a preferred embodiment of the invention and in which like reference characters indicate like parts in different figures.

In the drawings:

:FIG. 1 is a general plan bodying the invention;

FIG. 2 is a front elevational view of same with a part removed, the part of FIG. 2 lying to the right of line A-A' being taken on line A-A in FIG. 1;

FIG. 3 is a side elevational view of the apparatus;

FIGS. 4a and 4b are planviews, respectively, of the left and right half portions of the body of the apparatus shown in FIGS. 1 to 3;

view of the apparatus em- FIGS. 5a and 5b being front views, respectively, of the left and right half portions of the body of apparatus FIG. 6 is a side elevation of the feeder body partly shown in section taken along the line BB in FIG. b;

FIG. 7 is a front elevation of the main feed gear box;

FIG. 7a is a front view of the clutch operating mechanism in the power transmission mechanism;

FIG. 8 is a plan view of the main feed and differential gear boxes, shown partly in section taken along the lines H-H in FIG. 7;

FIG. 8a is a cross section taken along the line KK' in FIG. 8;

FIG. 9 is a front elevational view of the differential gear box;

FIG. 10 is a side elevational view showing the main feed and differential gear boxes partly in section taken along the lines D-D' in FIG. 9;

FIG. 11 is a front elevation of the mechanism for the rotation of the delivering chuck wheel;

FIG. 12 is a side elevation of same;

FIG. 13 is a side elevation of the brake means for the delivering chuck wheel;

FIG. 14 is a rear elevational view of same;

FIG. 15 is a plan view showing the stop device for the carriage partly in section taken along the line E-E' in FIG. 16;

FIG. 16 is a front elevation of same taken along the line F-F in FIG. 15;

FIG. 17 is a side elevation of the same;

FIG. 18 is a plan view of the winch device for travelling the log carriage;

FIG. 19 is a diagrammatic front elevation of same;

FIG. 20 is a cross-sectional view taken along the line I-J' in FIG. 18;

FIG. 21 is a diagrammatic front elevation of the position indicator for the log carriage;

FIG. 22 is a diagrammatic side elevation of same;

FIG. 23 is a plan view of the log engaging device to be mounted on the band-sawing machine; and

FIG. 24 is a front elevation showing same partly in section along the line G-G in FIG. 23.

Referring to the drawings and first to FIGS. 1 to 3, a log receiving chuck wheel 19 and a delivery chuck wheel 20 are mounted for rotation on a main shaft 18 'journaled in bearings 14, 15, 16 and 17 secured to the top of a cast iron frame 3. Logs to be cut into boards are mounted substantially on the periphery of the receiving chuck wheel 19, which in this embodiment is gen erally hexagonal including six generally triangular segments. The logs are to be rotated by the delivery chuck wheel 20 which is adapted to be driven from a motor mounted on a main feed gear box 21 at a speed variable by the power transmission mechanism enclosed in said gear box. The logs are positioned by the chuck wheel 20 to be cut by band saw 37, when chuck wheel 20 is operated through the main feed gearing in box 21 and the differential delivery gearing in differential gear box 22. Being mounted on the periphery of the rotatable chuck wheels, they are cut continuously by band saw 37. With this arrangement, there is no need of imparting reciprocatory motion to the log carriage for each cutting stroke. The log positioning of feeding can be effected satisfactorily without interrupting the machine operation by advancing the chuck wheel 20 through axial sliding motion along the main shaft 18 of differential gear box 21.

Referring next to FIGS. 5a and 5b, the log or lumber receiving chuck wheel 19 includes triangular segments each including a peripheral beam which has lumber receiving seats 28 formed at opposite ends to overhang at right angles to its body. A lumber presser foot 35 is provided to cooperate with the lumber receiving seat 28 and has a sole surface extending parallel thereto to hold a lumber placed on the seat. The presser feet 35 are actuatable by threaded rods 33 and 34 which are each vertically movable by way of a worm wheel 32 meshing with a worm mounted on either end of a worm shaft 29, which is rotatable by a handle 31.

As seen in FIGS. 2, 4a, 5b and 6, the delivery chuck wheel 20 includes a number of peripheral frame beams forming respective triangular segments of the wheel (six in number in this embodiment) and chuck brackets 36 attached to the respective beams intermediate the ends thereof. A handle 53' is secured to a threaded shaft 38 at one end thereof and is operable to move the latter radially of the chuck wheel 20. The threaded shaft 38 is threadably engaged with a support member which rockably supports the outer hacker arm 39 by means of a pin 41 in a manner so that the hacker arm 39 can be moved radially inwardly and outwardly. Also, provided is a rod 52 which is radially movable by operation of a handle 53 arranged adjacent one end of the rod. The rod 52 is properly pivoted at the other end to an inner hacker arm supporting arm 45 by means of a pin 51 for radial movement of an inner hacker arm 44, which is rockably supported on said supporting arm 45 at its one end by means of a pin 48. The supporting arm 45 is properly pivoted to the chuck bracket by a pin 46. The hacker arms 39 and 44 carry at opposite ends hacker 40 and 47, respectively, so as to uniformly clamp and hold in place the lumber by operation of handles 53' and 53 despite variations in its thickness.

Hacker arms 39 and 44 are provided with spring means 42, 43 and 49, 50, respectively, which are adjustable to maintain the hacker arms when not used in parallel with the adjacent beam of the delivery chuck wheel.

As shown in FIG. 5b, grooved eccentric rollers 54 and 55 of the same configuration are mounted on respective pairs of bearings 5657 and 58-59 which are secured to the beam of the chuck wheel 20. A handle 62 is provided to rotate each grooved roller by way of a worm gear 60 or 61. The radially remote portions of the grooved eccentric rollers are operable to bite into the lumber and there are provided a scale 63 and a cooperating pointer 64 for each roller so that the forward edge of the lumber may be advanced prior to the cutting by a distance corresponding to the desired thickness of boards to be sawed off from the log.

Referring next to FIGS. 23 and 24, there is provided a band-sawing machine which includes a cont-rolling bracket frame 68 carrying bearings 69 and 70, in which a shaft 71 carrying a number of round rollers is journaled. The bracket frame is mounted on a shaft 67 journaled in bearings 65 and 66 secured to the machine bed and is mounted on an eye bolt 73 by way of an opening formed in the frame at its one end. The bolt 73 is suitably secured to the machine bed with a coil spring 74 mounted on said bolt between the machine :bed and the bracket frame 68. A nut 75 is adjustable on the bolt 73 so as to place the round rollers in tangential contact with the cutting edge of the band saw so that the rollers in contact with the lumber being cut serve to make the latter stable.

As seen in FIGS. 5a and 5b, the supporting chuck wheel 19 is connected with the delivery chuck wheel 20 by means of male guide pieces 27 on the supporting chuck wheel 19 which are in sliding engagement with respective female guide members 26 carried on the delivery chuck wheel, both chuck wheels being rotatable.

- A power transmission mechanism shown in FIGS. 7 and 8 is provided which includes a drive pinion 24 operable to rotate the delivery chuck wheel 20 by way of a gear 25. The shaft of a motor mounted on the main feed gear box 21 by suitable bracket means carries two V- wheels 88 and 89 having the same diameter, which is operably connected by way of V-belts 100 with respective V- wheels 86 and 87 loosely mounted on an intermediate shaft supported on two bearings 99, which are also secured to the main feed gear box.

' V- wheels 83 and 84 of the same diameter are mounted on the other end of the intermediate shaft 85. Another intermediate shaft 90 is mounted in the main feed gear box and extends outwardly beyond the latter with V- wheels 81 and 82 loosely mounted on the extended end of the shaft 90' and connected by V-belts 123 with respective V- wheels 83 and 84. Suitable bearings are mounted on the opposite walls of the main feed gear box to support the intermediate shaft 90. Also mounted on the walls of the gear box are bearings 76 and 77 for supporting a pinion shaft 78 which carries a pinion 78 meshing with a gear 80 mounted on the intermediate shaft 90'. As shown, thedrive pinion 24 is mounted on one end of the pinionshaft which extends forwardly beyond the adjacent wall of the main feed gear box. Clutches 90 and 91 are provided to selectively couple the V- wheels 81, 82 and 86, 87 to respective intermediate shafts 90' and 85, on which said V-wheels are loosely mounted. With this arrangement, it will be apparent that the speed of rotation of the pinion 24 and gear 25 and hence of the chuck wheels 20'and 19 can be varied in four steps. 1 The V-belts 100 can be adjusted in tension by adjusting screws 101, 102,103 and 104 provided on themotor bracket while the V-belts 123 are adjustable by adjustment of intermediate shaft 85. The operation of the clutches 90 and 91 will be described in further detail hereinafter. i

As shown in FIG. 8, a first main feed trans-mission shaft 106 are supported by bearings 107 and 108 suitably mounted in the walls of the main feed gear box 21, and an appropriate bearing 109 formed on the rear wall of the differential gear box 22, and gears 110, 111, 112 and 113 having teeth'differing in number in aprogression are mounted on the transmission shaft 106 within the main feed gear box. The shaft106 also carries on its forward end a gear 105 in meshing engagement with the gear 25. The gears 110, 111, 112 and 113 are arranged to drive respective gears 114, 115, 1 16 and 117 by way of idler gears 118, 119, 120 and 121, the first two of which are mounted on a lever block 165 with the remaining two gears 120, 121 mounted on another lever block 166. The gears 114, 115, 116 and 117 are mounted on a second transmission shaft [122 supported by appropriate bearingsmounted in the walls of the main feed gear box 21. second transmission shaft and is in mesh with a gear 125 loosely mounted on the m ainshaft 18. Also in mesh with the loose gear 125 are gears 126, 127, 128 and 129 mounted on respective threaded shafts 130, 131, 132 and 133, which are mounted on appropriate bearings carried by the walls of the main feed and differential gear boxes 21 and 22 so as to extend through the rear wall of the main feed gear box and the .front and rear walls of the differential gear box.

' A number of gears 134, 135,136, 137 and 138 having different numbers of teeth are mounted on the first main feed transmission shaft 106 within the differential gear box 22 and are in mesh with respective gears 145, 146, 147, 148 and 149 mounted on a third transmission shaft 144 by way of idler gears 139, 140, 141, 142 and 143, the third shaft 144 being journaled in appropriate bearings mounted in the walls of the differential gear box. Also mounted on the third transmission shaft 144 isa pinion 150 which is engageable with a two-step gear 151 loosely mounted on the first transmission shaft by way of a combination idler gear 152-153 or an idler gear 154 for rotation in a forward or reverse direction. The twostep idler gear 151 includes a pinion meshing with the larger gear of a two-step idler gear wheel 155 loosely mounted on the third transmission shaft 144, said pinion being also in mesh with a gear 156 loosely mounted on the main shaft 18. The gear 156 is in mesh with gears 157, 158, 159 and 160 mounted on the respective threaded shafts 130, 131, 132 and 133 (see FIGS. 9 and These gears 157, 158, 159 and 160 each have a threaded axial bore and a forward boss portion having an inner and an outer diameter respectively to threadably fit in the associated threaded shaft and over the female threads formed in the associated bearing 161, 162, 163 or 164 A pinion 124 is mounted on the.

so as to slide along the shaft while rotating with the gear 156 in meshing engagement therewith. Among idler gears 139, 140, 141, 142 and 143 cooperating with gears 134, 135, 136, 137 and 138, idler gears 139 and are mounted on a lever block 67, gears 141 and 142 on another lever block 168 and gear 143 on a further lever block 169. These lever blocks 167, 168 and 169 as well as the aforementioned lever blocks 165 and 166 are all mounted on the first transmission shaft 106 and are operable to rock about the axis thereof for selective engagement of the gears thereby to afford different feeds of the delivery chuck Wheel. Specificially, the amount of feed given by the main feed gear selected by operating lever blocks 165 and 166 may further to finely varied by operation of lever blocks 167, 168 and 169 and the one for the two-step idler gear 151. It will be recognized that with the illustrated embodiment different amounts of feed, forty in all can, can be obtained by operation of the six lever blocks.

As shown in FIG. 6, the lever blocks 165, 166, 167, 168 and 169) have their outer ends jointed by pin means to the lower forked end of respective vertical r- ods 170, 171, 172, 173 and 174, which have upper forked ends thereof jointed by pin means to one end of handle lever blocks 175, 176, 177, 178 and 179, respectively, as shown in FIG. 4a. i

As shown in FIGS. 4a and 4b, brackets 180, 94, 182

and 92 are secured to the four top corners of the main feed gear box 21 and similarly brackets 184, 185, 186 and 187 are secured to the four top corners of the differential gear box 22. An elongated pipe 188 is supported at one end by bracket and extends through bracket 182 to a point adjacent to the right-hand end of the frame 3, as viewed in FIG. 4b. An elongated pipe 189 is supported by brackets 94 and 92 and elongated pipes 190 and 191 are supported by brackets 184, 186 and brackets 185, 187, respectively. Brackets 181 and 183 are secured adjacent the right-hand ends of the elongated pipes 188 and 189, respectively, with a cross holder shaft 200 supported by brackets 181 and 183 to extend at right angles to the elongated shafts. A bracket 192 is supported by the elongated pipe 188 intermediate the brackets 182 and 181 while a bracket 193 is supported by the elongated pipe 189 intermediate the brackets 92 and 183. The brackets 192 and 193 support a shaft 196 at right angles to the elongated pipes. The shaft 196 defines a fulcrum point about which handle levers 175 and 176 are operated. The cross shaft 200 is formed with constraining guides for these handle levers. Similarly, elongated pipes 190 and 191 have secured thereto brackets 198, 194 and brackets 199, 195, respectively, with a cross holder shaft 201 arranged between brackets 198, 199 and a shaft 197 between brackets 194, 195. The cross holder shaft 201 serves as a member to support constraining guide pieces for respective handle levers 177, 178 and 179 while shaft 197 acts as a fulcrum therefor. With this arrangement, any of idler gears 110, 111, 112, 113, 134, 135, 136, 137 and 138 can be selected for effective driving engagement by said handle levers, as will be ,readily observed. The handle levers for idler gears 152, 153 and 154 are also arranged to serve therefor in asimilar fashion.

The clutch 91 interposed between the motor on the main feed gear box and the idler V-wheels on the intermediate transmission shafts is jointed with crank 97 by pin means at the top and bottom ends of a vertical rod 202, as shown in FIG. 7a. A crank shaft 203 integral with crank 97 extends through the aforementioned elongated pipe 189 and is journaled in the opposite ends thereof. Thus, the clutch 91 may be engaged or disengaged by lateral movement of a handle 96. Another clutch 90 is connected with a crank 93 by way of a vertical rod 204 pivoted at opposite ends to the clutch 90 and crank 93. A crank shaft 205 integral with crank 93 is journaled in bearings mounted on respective brackets 206 and 207 secured to elongated pipe 189 (FIG. 4b) so that the clutch 90 can be engaged and disengaged by lateral movement of handle 98.

FIGS. 11 and 12 illustrate in detail a stop motion mechanism for the delivery chuck wheel 21). A rotation restraining bracket 2118 is secured to the delivery chuck wheel 20 and a threaded member support 213 is secured by a lock screw 214 to the bracket in a position thereon as illustrated. A pin 209 is secured to the bracket at a point thereon. A stop guide 210 is swingably mounted at one end on said pin 209 and pivoted adjacent to the other end to the forked end of a threaded member 212 by pin means 211, which threaded member extends through said support 213. The stop guide 211? can be held in a position adjusted by operating a nut on said threaded member 212. As illustrated, brackets 215 and 212 are secured to the side of the frame 3 and a lever 217 is pivoted intermediate its ends to the bracket 215 by means of a pin 216. The lever 217 carries a pin 218 at its bent top end to support a roller 219 and has a tapered bottom end in which a downwardly open notch is formed for the purpose described below. A guide block 221 has a cylindrical head portion formed with a conical top and is slidably fitted in a vertical aperture in the bracket 220. The bottom portion of the vertical aperture is screw-threaded to threadably receive an adjustable spring abutment 223 to confine a compression spring 222 between the top of the spring abutment and the underside of the head of guide block 221. An axial aperture is formed through the spring abutment 223 to receive the leg portion of the guide block 221, the conical top end of which is normally biased by the compression spring 222 into the notch in the bottom end of lever 217. A rod 224 is pivoted at one end by means of a pin 225 to a point adjacent the top end of the tapered bottom portion of the lever 217 and at the other end by means of a pin 228 to a switch lever 226. A lug is formed on the rod 224 intermediate its ends for engagement with a push-out cam 229. A hydraulic cylinder 2311 is pivotally mounted by means of a pin 231 on the inside surface of the frame 3 between brackets 232 and 233 secured thereto and is rockable between the solidand dotted-line positions shown in FIG. 11. A piston 234 is arranged in the hydraulic cylinder for vertical sliding movement therein. A stop member 235 is secured to the top of piston 234 and oil pressure can be introduced into the space in the cylinder extending beneath the piston 234. A vertical rod 237 is pivoted at its top end by a pin means 236 to that end of the rod 224 adjacent to the switch lever and is .swingably mounted intermediate the ends by means of a pin 238 on the frame 3. A horizontal rod 240 is pivoted at one end by a pin 239 to the bottom end of the vertical rod 237 and at the other end to the valve rod 242 of an oil pressure regulator valve 243 by means of a pin 241. One side of the oil pressure regulator valve 243 is in communication with the hydraulic cylinder 239 by way of a hydraulic circuit line 244 and a high-pressure rubber hose 248 and the other side of the valve with a pressure regulator cylinder 246 by way of a hydraulic circuit line 245, which includes an oil pressure gauge 247.

With this arrangement, if the stop guide 213 is adjusted in position so as to come into contact with the roller 219 just before the lumber has been completely cut, such contact will cause the lever 217 to rock about pin 216 and the lever 224 will be moved more than a distance corresponding to the movement of the roller 219 under the effect of the compression spring 222. Accordingly, the switch lever 226 is moved to open a switch 227 for the motor mounted on the main feed gear box 21 to deenergize the motor. At the same time, the vertical rod 237 rockable about the pivot pin 238 causes the horizontal rod 240 to operate the valve rod 242 in a direction to open the oil pressure regulator valve 243. On the other hand, the push-out cam 229 operates to forcibly swing the hydraulic cylinder 230 about pin 231 from S the dotted-line position to the solid-line position in FIG. 11, when the stop member 235 is brought into abutment with the shoulder on the rotation restraining bracket 298 and the delivery chuck wheel 20 ceases to rotate.

To release this rotation restraining eifect, switch 227 is first closed to start reverse rotation of the motor thereby to release the contact between the stop guide 210 and roller 219. Then, when handle 249 is operated to restore the lever 217 to its initial position, the rods are moved in a direction opposite to that in which they are moved for stopping the chuck wheels and the regulator valve 243 is opened while on the other hand the push-out cam 229 is released to allow the hydraulic cylinder 230 to be restored to its normal position indicated by the dotted lines in FIG. 11 under the resilience of the highpressure rubber hose 248.

Shown in FIGS. 13 and 14 is a brake device for the delivery chuck wheel 20 and hence for the supporting chuck wheel 19 and provided for stopping the chuck wheels in emergencies. The device takes the form of a conventional band brake which is operable by stepping on a pedal 297 and the construction and operation of which will be apparent from FIGS. 13 and 14 Without any further description.

As shown in FIGS. 1, 2 and 3, the lumber carriage 3 is mounted on four wheels 2 riding two rails, one of the fiat type and the other of the angular type. The carriage 3 carries on the rightand left-hand sides thereof respective wire-anchoring members 5 and 7, to which a wire 8 is secured at opposite ends which extends over a Wire wheel 6 and is wound about a winch drum 4. A handle 289 is provided on the winch and operable to cause the carriage 3 to travel right and left by way of wire 8. The travelling movement of the carriage is automatically interrupted by four sets of stops 252 which are engaged upon arrival of the carriage at a predetermined position. The stop device will next be described in further detail with reference to FIGS. 15, 16 and 17.

In FIGS. 15, 16 and 17, flanged members 252 are secured to both the rightand left-hand sides of the frame 3 immediately above the respective rails. As shown, a stop rod 250 is fitted in the axial bore formed in each of the flanged members 252 and carries a collar 267 held on a shoulder portion of the rod with acoiled spring 268 arranged to surround the latter between the collar 267 and the flange portion of the member 251. As shown in FIG. 1, secured to the rails 1 at opposite ends thereof are stop brackets, four in all, each of which includes chuck pieces 253 and 254 pivotally mounted on respective pins 255 and 256. A cam 259 is slidably fitted (between the chucking pieces 253 and 254 and has front and rear inclined sliding surfaces in sliding engagement with the top inside surfaces of the chucking pieces. The cam 259 is mounted on a pin 257 serving as a guide for the chucking pieces with a coiled spring 258 interposed between the outside surface of the chuck piece 253 and the underside of the head portion of the pin 257. The inner surfaces of the chucking pieces are recessed centrally thereof to define therebetween a truncated conical bore aligned with the axis of the stop rod 250. As illustrated, the cam 259 is provided with a bellcrank lever including arms 260 and 264 extending at right angles to each other and formed at the extremity with respective bearin g apertures having axes parallel to the axis of pin 257. Link rods 9 and 10 have cylindrical ends journaled in the respective bearing apertures. The cams 259 for the chucking pieces on the stop brackets arranged on the respective rails adjacent to the winch are interconnected by the two li- nk rods 9 and 10. A vertical treadle rod 263 is pivoted by a pin 262 to one of t he link nods 9 sulbstantially at the middle thereof. The link rod 10 is connected nearly at the middle of its length wit-h the forked end of an elongated link rod 12 by a pin 11. A similar link rod 13 is provided for the chuck cams mounted on the stop brackets located on the

Claims (1)

1. A BAND-SAWING MILL HAVING A BAND SAW AND A LUMBER FEEDING MEANS WHICH MEANS COMPRISES A HORIZONTALLY DISPOSED GENERALLY CIRCULAR ROTARY CHUCK WHEEL HAVING A PLURALITY OF CHUCK MEANS PROVIDED CIRCULARLY ON THE WHEEL FOR HOLDING LUMBER ON THE PERIPHERY OF THE CHUCK WHEEL

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