US1129225A - Sawmill set-works. - Google Patents

Description

G. M. PELTON.

SAWMILL SET WORKS.

APPLICATION FILED MAY 29, 1914.

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G. M. PELTON.

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SAWMILL SET WORKS.

APPLICATION FILED MAY 29, 19 14.

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GEORGE M. PELTON, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO THE FILER &. STOWELL COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATIQN OF \VIS'CONSIN.

SAWMILL SET-WORKS;

Application filed May 29, 1914:.

To all whom it may concern:

Be it known that I, Gnoncn M. Pnnron, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain after particularly described and pointed out in the claims.

For the purpose of illustration the improvements of which. the present invention consists are shown in connection with cable-driven set works of the class disclosed in United States Letters Patent No. 1,043,355, dated November 5, 191 2, but they may be embodied in set works otherwise driven.

In the accompanying drawing like characters designate the same parts in the several figures.

Figure 1 is a plan view partly in horizontal section on the line 11., F ig; 2, of set-works embodying the invention; Fig. 2 is a rear elevation of'the same, omitting the head block; Fig. 3 is an enlarged end elevation of the set works as viewed from the right relative to Figs. 1 and 2, without the head block; Fig. ll is an enlarged front ele-- vation of a part of the setting mechanism as viewed from the right relative to Fig. 3; Fig. 5 is a section on a still larger scale n a plane lengthwise of the set shaft, indicated by the line 55, Fig. 6; Fig. 6 is a fragmentary end elevation similar to Fig. 3, but on a larger scale, showing the stop arm in a difierent position; Figs. 7 and 8 are similar fragmentary cross sections on the line 77, Fig. 5, showing parts of the setadjusting mechanism on a smaller scale in different positions; Fig. 9 is a section on. the line 99, Fig. 5, showing meansfor the angular adjustment of the back stop relative to the set-adjusting wheel; and Fig. 1J0=1S a detail sectional view similar to Fig. 5, of a Specification of Letters Patent.

Patented Feb. 23, 11915.

Serial-No. $41,705.

modification of the detent for locking and holding the set-adjusting wheel in different posltions.

Referring to the drawing, and particularlyto Figs. 1 and 2, the set shaft 1, which as usual, is arranged lengthwise of the carriage, has bearings in the frame 2, and is provided with bevel gears 8 and 4. The carriage is provided as usual, with two or more head blocks 5, a portion of one head block being shown in Fig. 1. The head blocks are provided with knees or standards (not shown) to which the log, cant or timher to be sawed is fastened by dogs in a well known manner, the knees or standards being guided and movable on the head blocks toward and from the saw plane and being operati-vely connected with the set shaft in any suitable manner. In the present case a screw shaft 6, connected with the set shaft by bevel gears 7, is shown for the purpose.

Tubular shafts 8 and 9, rotatably mounted parallel with each other and at right angles to theset shaft on round rods 10, secured in the frame 2, are provided with bevel gears or pinions 11 and 12, meshing respectively with the gears 3 and 4a. The rods 10- at their rear ends are connected and braced by abar 13. Upon the shafts 8 and 9 are loosely mounted grooved pulleys or sheaves 14 and 15, around which a driving rope or cable 16 runs to and from driving and guiding pulleys or sheaves located as usual, adjacent tothe ends of andbelow the carriage ways. @n the rear ends of the shafts 8 and 9- are fixed beveled friction wheels or clutch members 17. The pulleys or sheavesla and l5 are formed or provided with beveled rims or clutch members 18, adapted to cooperate with the friction. wheels or clutch members 17 for operatively connectingthe set shaft 1 with either of the pulleys or sheaves 14c and 15, said pulleys or sheaves being capable of a limited axial movement as well as of rotary movement, on the shafts 8 and 9. The hubs of the pulleys 1a and 15 are provided with and rotatable in collars 19, which are connected witheach other above and below the shafts 8 and 9 by parallel links or bars 20. The bars 20 are connected adjacent to said collars by rods 21, with strap'heads or members 22 of eccentrics 23, on. a rocker shaft 24. The shaft 24 is supported in bearings in the frame 2 in front of and parallel with the set shaft 1, and is provided with a hand lever 25 for operating the clutches and controlling the operation of the set works.

To instantly stop the set works and prevent its overthrow by momentum when the set shaft is disconnected from the drive pulleys or sheaves 14c and 15, one of the friction wheels or clutch members ,17 is provided with a brake band 26, which is connected at its ends to a cross head or two armed lever 27, on a transverse rocker shaft 28. The shaft 28 is provided with an arm 29,'which is connected by a curved or elbowshaped link 30 with an arm 31 on the rocker shaft 24. This connection is so made that the brake'band will be applied when the hand lever 25 is in its middle or neutral position, and will be released when said lever is turned in either direction from such position to connect the set shaft with either of the drive pulleys or sheaves 14- and 15 through the gears 3 and 11 or A and 12, for advancing or withdrawing the knees or standards.

As thu far described the set works are substantially like those shown and described in the Letters Patenthereinbefore mentioned, except that the eccentrics 23 are so set in the present case that the movement of the hand lever 25 from its neutral position toward the set shaft, operates to connect the set shaft through the gears 3 and 11, with the pulley or sheave 1A for setting or advancing the knees, instead of through the reversing gears A and 12 for receding, as in the former case.

To facilitate adjusting the setting mechanism for cutting lumber of different dimensions, and to render the operation of the set works as nearly automatic as pract1- cable, the following seteadjusting and controlling mechanism is employed: Referr ng more particularly to Figs. 3 to 6 inclusive, formed with or attached to the gear 3 is a toothed rim or setting wheel 32, which how ever, may be separate and distinct from the gear 3, and secured independently thereof on the set shaft 1. A stop arm 33, rotatably mounted coaxially with the setting wheel 32, is provided with a pivoted pawl or dog 3%, movable into and out of engagement with the toothed rimor wheel 32. The hub 35 of the arm 33, which projects therefrom at the end next to the setting wheel 32, is formed with internal and external screwthreads of the same hand, and is mounted upon an externally threaded, fixed or nonrotative sleeve 36, which preferably encircles the hub of the gear 3 and setting wheel 32, and has an extended bearing onthe set shaft 1, as shown in Fig. 5.

A graduated set-adjusting hand wheel 37 has an internally threaded hub 38, mounted gaging screw threads of the sleeve 36 and of the hubs 35 and 38, are so formed that like angular movements of the stop arm 33 and of the setting wheel 37 will produce corresponding axial movements thereof, the backward or counterclockwise angular movement of said arm and wheel shifting them axially away from the setting wheel 32. The sleeve 36 is held against rotation by an arm 39, which has a split collar 40 clamped on the sleeve, and a collar 41, loosely encircling the shaft 24.

A back stop l2, for limiting the backward movement of the stop arm 33 in different positions, is provided with a split collar 43, which is adjustably clamped on the hub 38 of the set-adjusting wheel 37. Opposing screws 44, threaded in the collar 43 and engaging at their inner ends with a lug -15 on the hub 38, as shown in Fig. 9, afford means for accurately adjusting the angular rela tion of the stop 42 to the set-adjusting wheel 37, so that when said wheel is locked in any given position and the stop arm 33 is turned back into contact with said stop, the dog 34: will properly engage with the teeth or notches of the setting wheel 32.

The rim of the wheel 37 is graduated and numbered from left to right or clockwise, as viewed in Figs. 3 and 6, to facilitate adj usting the back stop 42 for cutting lumber of difi'erent dimensions. It is also formed at intervals with notches with which a detent -16, pivotally connected with the arm 39, is movable by the setter into and out of engagement for setting and locking the stop 4-2 in its different positions, as indicated by the scale on said wheel.

A bow-spring 4L7, connecting the detent A6 with the arm 39 or its collar A0, is adapted to hold said detent in or out of engagement with the wheel 37, the movement of the detent away from the wheel being limited by the engagement of projections 4-8 on the detent with lugs 49 on the collar 40, as indicated by dotted lines in Fig. 5. The detent is formed or provided with a handle 50, to facilitate throwing it into and out of operative position. The stop 42 is provided with a spring catch 51, adapted by engagement with a lug 52 on the side of the arm 33, to prevent recoil of the arm when the arm or lug is turned back into engagement with the stop.

The forward movement of the stop arm 33 is limited by engagement of the arm with a projection on frame 2, which serves as a front stop, as shown in Figs. 1 and 3.

To automatically disconnect the set shaft from the driving pulley or sheave ll and arrest the advance movement of the setworks when the stop arm is turned forward with the setting wheel 32 into engagement with the front stop, the rocker shaft 2L is provided with an incline 53, which may be formed as shown, with the hand lever 25, and is arranged to cooperate with a roller 54 on the stop arm to turn said lever with the rocker shaft into its middle or neutral position and; thereby disengage the clutch members 17 and 18 connectingthe set shaft 1 through the gears 3 and 11 with the driving pulley or sheave 14.

For throwing and holding the dog 34 out of engagement with. the setting wheel 32 to permit the stopv arm 33 to. be turned backward against the back stop Q, the rocker shaft 24 is provided with an arm 55,. which may be formed as shown, on the hub of the lever 25 in the patch of the heel of the dog 34 when said lever stands in theposition to which it has been shifted by the roller 54, as shownin Fig. 3.

The dog 34 is preferably provided, as shown in Figs. 5 and 6, with an anti'friction roller 56, for engagement with the arm 55. A rod 57, pivoted at itsouter end to the heel of the dog 34 and formed or provided at its inner end with a hook for engagement with a lug 58 on the hub 35 of the stop arm 33, as shown in Fig. 7, is connected with said, stop arm by a. spring 59. This spring is arranged to hold the hook in engagement with the lug 58 when. the arm 33 is turned backward, and when the hook is disengaged from the lug to hold. the dog 34 in engagement with the setting wheel 32- for turning the stop arm forward.

To automatically disengage the hooked rod 57 from the lug 58. and release the dog 34 when the stop arm 33 is turned back against the stop 42,. the hub 43 of the stop is provided with a pin or projection 60, inthe path of said rod, as shown in Figs. 1, 7 and 8.

To look and hold the rocker shaft 24 with the eccentrics 23 in neutral position and the members 17 and 18 of both clutches out of engagement, the lever 25 is provided with a spring latch 61, working with an are 62, as shown in Fig. 3. The are is formed withan elongated opening 63, of such length and so positioned that when the latch engages therewith the members of'both clutches will be held apart, and that said lever may be turned forward from the position in which it is shown in Fig. 3 a suflicient distance to disengage the dog 34 from the setting wheel 32 without withdrawing the latch 61 from the opening 63 and without permitting engagement of the clutch members 17 and 18 on the shaft 9. i

To automatically turn the stop arm 33 backward against the back stop 42 after it has been turned forward against the front stop and the dog 34 has been disengaged from the setting wheel 32, the hub of said arm is formed or provided with a drum 64, which is connected by a cord or cable with a spring actuated winding drum. 65. The

drum 65 is fixed on a shaft 66, which is supported in, front of and parallel with the shaft 24 in bearings on the frame 2 and in the arm 39. A long spiral spring 67, coiled around the shaft 66 and fastened at one end to a collar 68 thereon, and at the other end to one of its fixed bearings, tends to wind the cable or cord around the drum 65 in the direction to turn the drum 64 with the arm 33 backward, as indicated by an arrow on Fig. 3.

A stop. 69, pivoted above and adjacent to the setting wheel 32, on an arm 70, extending upwardly from a bearing of the set shaft or a, part of the set works frame, is adapted to be turned by the operator into and out of the path of the stop arm 33 between the front and back stops, so as to hold the automatic set-adjusting mechanism out of action for the purpose of receding or withdrawing the knees or standards and adjusting them to the desired position on the head blocks to make the first cut. This stop is, provided with a handle 71, and its movement is limited by a slotted connection 72 with the arm 70, the handle being of.

sufficient weight to hold the engaging end of the stop in its upper position out of the path of the stop arm 33. The working end of the stop is concaved as shown in Fig. 3, to fit the convex end of a housing 73 for the dog 34 on the arm 33, so that when said arm is released and turned backward against said stop by the spring actuated winding drum 65, the stop will be retained in engagement therewith without being held in place by the setter.

The stop arm 33 is extended and provided on the opposite side of the set shaft from the dog 34 with a counterweight 74, for balancing the arm with its attachments.

A lumber scale 75, mounted on the arm and connected by gears with the set shaft, indicates the position of the knees or standards relative to the saw plane.

In the operation of the set works, a log, cant or timber to be cut into lumber having been secured in the usual way to the knees or standards and adjusted therewith to the desired position for making the first cut, and such out having been made, the detent 46 being thrown back out of engagement with the set-adjusting wheel 37, said wheel is turned back with the stop 42 to a position indicated by the scale marked on the rim of the wheel for cutting a board or piece of lumber of the desired thickness, say one inch. Said wheel and stop are then locked in place by turning the detent 46 into engagement with the opposite notch in the rim of the wheel, and the stop arm 33 beingreleased by the setter lifting the stop 69 out of engagement with the housing 73, is turned by the spring actuated drum 65 backward against the back stop 42. The

' ing pulleys or sheaves l4: and being constantly rotated while the mill is in operation by the rope or cable 16, in the direction indicated by arrows in Fig. 2, the set shaft 1 is turned forward by the gears 3 and 11, and the stop arm 33 connected by the dog 34: with the setting wheel 32, is turned forward therewith until its movement is arrested by engagement with the frame 2 or front stop, as shown in Figs. 1 and 3. As the arm 33 is brought into engagement with said front stop, the roller 5% engaging with the incline 53, throws the lever forward till its latch 61 drops into the opening 63, as shown in Fig. 3, thereby disengaging the clutch members 17 and 18 on the shaft 8 and applying the brake band 26. The advance of the knees or standards is thus instantly and accurately arrested at the desired point for making the next cut. If an other board or piece of lumber of the same thickness is to be cut, on the next advance movement of the carriage the setter first turns the lever 25 forward as far as its latch 61, which is not withdrawn from the opening 63, will permit. This movement of the lever causes the arm 55 in engagement with the heel of the dog 34: or the roller 56 with which it is provided, to throw the dog out of engagement with the setting wheel 33 and to shift the hooked rod 57 into engagement with the lug 58, as shown in Fig. 7. The stop arm 33 being thus released, is turned backward by the spring actuated drum 65, against the back stop L2, as shown in Fig. 8. As the lug 52 on the stop arm is brought into engagement with the back stop 42, the pin or projection 60 throws the hooked rod 57 out of engagement with the lug 58, thereby releasing the dog 34 and permitting it to be turned back by the spring 59 into engagement with the setting wheel 32. The setter then withdrawing the latch 61 from the opening 63 in the are 62, pulls the lever 25 back toward the set shaft, thereby closing the clutch on the shaft 8 and operatively connecting the set shaft with the driving sheave 14: through the gears 3 and 11. The knees or standards are thereupon advanced and automatically stopped in position, as explained above, for sawing another inch board.

If desired, the log, cant or timber may be completely cut into boards or lumber of the same thickness by the simple manipulation of the hand lever 25, as above explained, so far as the adjustment of the set works is concerned.

In cutting lumber of different dimensions or thicknesses, the wheel 37 is set by hand for each dimension or thickness. Assuming that one revolution of the wheel 37 represents an advance movement of the knees or standards equal to four inches, and it is desired to cut a piece of lumber, say five inches thick, said wheel is turned back from its initial or zero position one and one-quarter turns, as indicated by the scale on its rim, and locked in that position by the detent 46. In turning the wheel 37 backward more than one revolution, as above stated, the back stop 42 is shifted by the screw-threaded connection between the hubs 35 and 3S axially away from the arm 33, while the latter is held against its front stop by the dog 31-, into a position in which. said stop will be cleared and Passed by said arm or the lug 52 thereon, in its next revolution backward. In like manner, if the wheel 37 is turned backward between two and three revolutions for adjusting the stop l2 to cut a piece of lumber between eight and twelve inches thick, said stop will be shifted axially into a position in which it will be cleared and passed twice by the arm 33 in its next backward movement. As the arm 33 is turned backward it is in like manner shifted axially by the screw-threaded connections of its hub 35 with the sleeve 36 and hub 38 away from the wheel 32 and toward the wheel 37, the wheel 37 being in a fixed position by the detent 46, until it has traversed an angular distance corresponding with that between the initial or zero and final or adjusted position of the stop 42 and its further movement is arrested by said stop. Upon the next forward angular movement of the arm 33 with the setting wheel 32, said arm is shifted axially away from the back stop 42 and toward said wheel to its former position against the front stop, the teeth of the dog 34: slipping on and lengthwise of the teeth of said wheel as the arm approaches the wheel, and said stop 42 with the wheel 37 maintaining the same positions as it had before.

lVhen a log or cant has been completely out into lumber, the setter lifts the handle 71, turning the stop 69 down into the path of the housing or projection 73 on the stop arm 33, and then turns the lever 23 forward as far as it will go with the latch 1 in the opening 63, thereby disengaging the dog 3t and releasing said arm which is thereupon turned back by the spring actuated drum (35 against said stop. As the housing 73 will now be held by the action of the spring 67 and drum G5 in engagement with the stop 69 the handle 71 may be released by the setter, who then withdrawing the latch 1 from the are (32, throws the lever 25 farther forward, thereby bringing the clutch membore 17 and 18 on shaft 9 into engagement with each other, as shown in Fig. 1, and

operatively connecting the set shaft 1 with the driving pulley or sheave 15, for receding or withdrawing the knees or standards to receive another log on the carriage.

4 lVhile the stop arm 33 is thus held by the stop 69 out of action, the setter or operator controls the movement of the knees or standards solely by the manipulation of the lever 25. When the log or cant is ready to be sawed into dimension lumber and it is de sired to bring the automatic set-adjusting mechanism again into action, the setter adjusts the back stop 42 for cutting a piece of the desired thickness by turning the wheel into the proper position as indicated by the scale thereon and looking it in that position by the detent 46. He then turns the handle 71 down, disengaging the stop 69 from the housing 73, and releasing the stop arm 33, which is thereupon turned back automatically by the drum 65 against the back stop 42 in readiness for advancing the knees with the log or cant the necessary predetermined distance on the head blocks, as soon as the clutch members 17 and 18 on shaft 8 are engaged with each other, and the set shaft 1 is thus operatively connected through the gears 3 and 11 with the driving pulleywor sheave 14 by the proper manipulation of the lever 25, as hereinbefore explained.

When the clutch members 17 and 18 on shaft 8 are engaged, the shafts 8 and 9 will be rotated as indicated by full line arrows on Fig. 1, the shaft 9 being rotated by its connection with the set shaft through the gears 4 and 12 and turning idly in the pulley or sheave 15. On the other hand, when the clutch members on shaft 9 are engaged, as shown in Fig. 1, the shafts 8 and 9 will be rotated in reverse directions, as indicated by dotted arrows on the same figure, the shaft 8 then turning idly in the pulley or sheave 14.

The direction of rotation of the set shaft 1 and of the screw shaft 6 for advancing the knees, is indicated by full line arrows, and the direction of rotation thereof for receding or withdrawing the knees, is indicated by dotted arrows on Fig. 1.

In place of the spring 47 for holding the detent in engagement with the Wheel 37 as shown in Fig. 5, a spring latch 76 may be pivoted to the detent so as to be caught over the rim of the wheel, as shown in Fig. 10. When so made the detent will, when the latch is disengaged from the wheel, be held by gravity out of operative position, with the projections 48 resting on the lugs 49. Made in either way, the detent by turning on its pivot connection with the arm 39 or collar 40, accommodates itself to the different axial positions to which the wheel 37 is adjustedfor cutting lumber of different dimensions or thicknesses.

Various changes in the details of constructi'on and the arrangement of parts of the set works may be made without departure from the principle and scope of the invention as defined in the following claims.

I claim:

1. In saw-mill set-works the combination with a set shaft and a driving member for turning the set shaft, of a setting wheel fixed on the set shaft, a fixed sleeve surrounding the set shaft, a stop arm and a graduated set-adjusting wheel having threaded engagement with one another coaxially with the set shaft so that like angular movements of said arm and wheel produce corresponding axial movements thereof, a back stop for said arm attached to and movable with said setad justing wheel in the path of said arm, a front stop for said arm, means for locking said wheel in adjusted position, means for detachably connecting said arm with the setting wheel, and means operated by said arm at the limit of its advance movement to automatically disconnect the set shaft and driving member.

2. In saw-mill set-works the combination with the set shaft and a driving member for turning the set shaft, of a setting wheel fixed on the set shaft, a fixed-externally threaded sleeve surrounding the set shaft, a stop arm having an internallyand externally threaded hub mounted on said sleeve, a graduated wheel provided with a back stop in the path of the stop arm and having an internally threaded hub mounted on the hub of said arm, a front stop for said arm, means for locking the hand wheel in adjusted position, means tending to turn the stop arm backward against the back stop, means for detachably connecting the stop arm with the setting wheel, means operated by the stop arm at the limit of its advance movement to disconnect the set shaft and driving member, and manually operated means for disconnecting the stop and setting wheel and con necting the set shaft and driving member.

3. In saw-mill set-works the combination with the set shaft, a driving member for rotating the set shaft, and a clutch for connecting the driving member and set shaft, of a toothed wheel fixed on the set shaft, an angularly movable stop arm provided. with a dog movable into and out of engagement with the toothed wheel, a graduated set-adjusting wheel rotatably mounted on the set shaft coaxially with said toothed wheel and stop arm and provided with a back stop in the path of said arm, means for locking the set-adjusting wheel in different angular positions, a front stop for said arm, and a lever for operating the clutch provided with a projection adapted to disengage the dog from the toothed wheel when the stop arm is at the limit of its forward movement.

4. In saw-mill set-works the combination with the set shaft, a driving member for tee rotating the set shaft and a clutch for connecting the set shaft with the driving member, of a toothed wheel fixed on the set shaft, a stop arm and a graduated set-adjusting Wheel rotatably mounted on the set shaft coaxially with said toothed wheel, a front stop for limiting the forward movement of said arm, a dog pivoted on the stop arm and movable into and out of engagement with said toothed wheel, a hooked rod connected with the dog and adapted by engagement with a lug on the stop arm to hold the dog out of engagement with the toothed wheel, a spring tending to hold said rod in engagement with said lug and when it is released to hold the dog in engagement with the toothed wheel, a back stop connected with the set-adjusting wheel in the path of the stop arm, means for locking the set-adjusting wheel with the back stop in different positions, a part connected with the back stop and adapted to disengage the hooked rod from said lug and to release the dog at the limit of the backward movement of said arm, and a lever for operating the clutch provided with a projection adapted to disengage the dog from the toothed wheel when said arm is at the limit of its forward movement.

5. In saw-mill set-works the combination with the set shaft, a driving member and a clutch for connecting the set shaft with the driving member, of a setting wheel fixed on the set shaft, a stop arm and a graduated set-adjusting wheel rotatably mounted on the set shaft eoaxially with the setting wheel, means for detachably connecting the stop arm with the setting wheel, a front stop for limiting the forward movement of said arm, a back stop connected with the set-adjusting wheel and adapted to limit the backward movement of said arm, and a lever for operating said clutch provided with an in cline adapted by engagement with the stop arm to disengage the clutch and stop the set shaft at the limit of the forward movement of said arm.

6. In saw-mill set-works the combination with the set shaft, of a toothed setting wheel fixed on said sha'ft, a stop arm and a graduated set-adjusting wheel rotatably mounted coaxially with said setting wheel, a dog mounted on said arm and movable into and out of engagement with said setting wheel, and a back stop mounted in the path of said arm and angularly adjustable on said setadjusting wheel.

7. In saw-mill set-works the combination with the set shaft, a driving member for rotating the set shaft and a clutch for connecting the set shaft with the driving member, of a toothed setting wheel fixed on the set shaft, a stop arm and a graduated setadj usting wheel mounted rotatably and coaxially relative to the setting wheel, a front stop for limiting the forward movement of the stop arm, a back stop attached to and movable with the set-adjusting wheel for limiting the backward movement of the stop arm, means for locking the set-adjusting wheel in different positions, a dog pivoted on the stop arm and movable into and out of engagement with the setting wheel, a hooked rod connected with the dog and adapted by engagement with a lug on the stop arm to hold the dog out of engagement with the setting wheel, a spring tending to hold said rod in engagement with said lug and to hold the dog when it is released in engagement with the setting wheel, a part connected with the back stop and adapted to disengage the hooked rod from said lug and to release the dog at the limit of the backward movement of the stop arm, a lever for operating the clutch, an incline connected with the lever and adapted by the engagement therewith of the stop arm to disengage the clutch and stop the set shaft at the limit of the forward movement of said arm, and a projection connected with said lever adapted to disengage the dog from the setting wheel when said arm is at the limit of its forward movement and the lever is turned away from the set shaft.

8. In saw-mill set-works the combination with the set shaft, a driving member for rotating the set shaft and a clutch for connecting the set shaft with the driving member, of a toothed setting wheel fixed on the set shaft, a fixed sleeve surrounding the set shaft adjacent to the setting wheel, a stop arm and a graduated set-adjusting wheel having their hubs threaded and rotatably mounted one upon the other and on said sleeve so that like angular movements will produce corresponding axial movements of the stop arm and set-adjusting wheel, a front stop for limiting the forward movement of the stop arm, a back stop connected and movable with the set-adjusting wheel for limiting the backward movement of the stop arm, means for locking the set-adjusting wheel with the back stop in different positions, a dog pivoted to the stop arm and movable into and out of engagement with the setting wheel, a. hooked rod connected with the dog and adapted by engagement with a lug on the stop arm to hold the dog out of engagement with the setting wheel, a spring tending to hold the hooked rod in engagement with said lug and when it is released to hold the dog in engagement with the setting wheel, a part connected with the back stop and adapted to disengage the hooked rod from said lug and to release the dog at the limit of the backward movement of the stop arm, a lever for operating the clutch, an incline connected with said lever and adapted by the engagement therewith of the stop arm to disengage the clutch and stop the set shaft at the limit of the forward movement of said arm, and a projection connected with said lever and adapted to disengage the dog from the setting wheel when said arm is at the limit of its forward movement and the lever isturned away from the set shaft.

9. In saw-mill set-works the combination with the set shaft, a driving member for rotating the set shaft and means for connecting the set shaft with the driving member at will, of a setting wheel fixed on the set shaft, a stop arm mounted rotatably and co axially relative to the setting wheel and provided with a drum and with means for detachably connecting it with the setting wheel, a front stop for limiting the forward movement of the stop arm, a graduated setadjusting wheel mounted rotatably and coaxially relative to the stop arm and pro vided with a back stop for limiting the backward movement of said arm, means for locking the set-adjusting wheel in diiferent positions, and a spring actuated drum connected with the drum on the stop arm and tending to turn said arm backward against the back stop.

10. In saw-mill set-works the combination with. the set shaft, a driving member for turning the set shaft and a clutch for connecting the set shaft with the driving member, of a toothed setting wheel fixed on the set shaft, a stop arm and graduated setadjusting wheel mounted coaXially with and rotatable independently of each other and of the setting wheel, a front stop for limiting the forward movement of said arm, a back stop connected with the set-adjusting wheel for limiting the backward movement of said arm in different positions, a dog mounted on the stop arm and movable into and out of engagement with the setting wheel, means operated by the stop arm to disengage the clutch and stop the set shaft at the limit of the forward movement of said arm, means for disengaging said dog from the setting wheel when the stop arm is at the limit of its forward movement, means tending to turn the stop arm backward against the back stop, means for engaging the dog with the setting wheel as the stop arm is brought into contact with the back stop, and a stop movable into the path of the stop arm between the front and back stops and adapted to hold the automatic setadjusting mechanism out of action for withdrawing or manually adjusting the knees,

1].. In saw-mill set-works the combination with the set shaft, driving members for turning the set shaft in opposite directions and clutches for connecting the set shaft with either driving member, of a toothed setting wheel fixed on the set shaft, a stop arm mounted coaXially with and rotatable independently of said wheel and provided with a dog movable into and out of engagement with said wheel, a front stop for limiting the forward movement of said arm, an angularly adjustable back stop for limiting the backward movement of said arm in different positions, means tending to turn said arm backward, means for automatically en gaging the dog with the setting wheel as the stop arm is turned backward against the back stop, a hand lever for operating said clutches and for disengaging said dog from the setting wheel when the stop arm engages the front stop, means operated by the stop arm to disengage the clutch of the active driving member at the limit of the forward movement of said arm, and a stop movable at will into the path of said arm between the front and back stops for withdrawing or manually adjusting the knees.

12. In saw-mill set-works the combination with the set shaft, driving members for turning said shaft in opposite directions and clutches for connecting said shaft with either driving member, of a toothed setting wheel fixed on the set shaft, a rotatable stop arm mounted coaxially with the setting wheel and provided with a dog movable into and out of engagement therewith, stops for limiting the forward and backward move ment of said arm, the back stop being angularly adjustable, a hand lever for operating said clutches and disengagingsaid dog from the setting wheel provided with a spring latch and adapted to be shifted away from the set shaft by said arm as it is turned to the limit of its forward movement and thereby automatically arrest the advance of the knees, and an are having an elongated opening into which the latch drops when the lever is turned into its middle neutral position and both clutches are disengaged, the length and position of said opening beingsuch as to permit a further movement of the lever away from the set shaft for disengaging the dog from the setting wheel and to prevent the engage ment of either clutch until the latch is withdrawn.

13. In saw-mill setworks the combination with the set shaft, of a setting wheel fixed thereon, a fixed sleeve surrounding the set shaft adjacent to the setting wheel, a stop arm and graduated set-adjusting wheel threaded and rotatably mounted one upon theother and upon said sleeve so that like angular movements of the wheel and arm produce corresponding aXia-l movements thereof, a front stop for limiting the forward movement of said arm, a back stop connected and movable with the set-adjusting wheel for limiting the backward movement of said arm in different positions, means for detachably connecting said arm with the setting wheel, and a detent pivotally connected with a fixed support and movable into and out of engagement with said set-adjusting Wheel for looking it in dilierent angular positions.

14. In saw-mill set-works the combination with the set shaft, of a setting Wheel fixed thereon, a fixed sleeve surrounding the set shaft, a stop arm and graduated set-adjusting wheel threaded and rotatably mounted upon each other and upon said sleeve, a front stop for limiting the forward movement of the stop arm, a back stop connected and movable with the set-adjusting Wheel for limiting the backward movement of said arm in different positions, means for detachably connecting said arm with said different angular positions, and a spring 20 adapted to hold the detent either in or out of engagement with said wheel.

In Witness whereof I hereto aflix my signature in presence of two witnesses.

GEORGE M. PELTON. Witnesses CHAS. L. Goss, ALICE E. Goss.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

. Washington, D. G."

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