US1038788A - Sawmill setting and receding mechanism. - Google Patents

Description

DE WITT- C. PRESCOTT.

SAWMILL SETTING AND REGEDING MECHANISM.

APPLIOATIOK FILED JUNE 9, 1911.

1,038,788. Patented Sept. 17,1912.

4 SHEETS-SHEET l.

Del/27 673686077,

COLUMBIA PLANOURAPH co.,wAsm:NuTON. D. C.

Imam

DE WITT G. PRESCOTT. SAWMILL SETTING AND REO'BDING MECHANISM.

APPLICATION FILED JUNE 9, 1911.

lm am or Fez/Q7 fiasco/Z Patented Sept. 17, 1912.

4 SHEETS-SHEET 2 COLUMBIA PLANOORAP" CD" WASHINGTON, D. C.

DE WITT G. PRESCOTT. SAWMILL SETTING AND RBGEDING MECHANISM.

APPLIGATION FILED JUNE 9, 1911.

' Patented Sept. 17, 1912.

4 SHEETS-SHEET 3.

c0LuMBl A PLANOHRAPH CO... WASHINGTON. D. C.

DE WITT G. PRESCOTT. SAWMILL SETTING AND momma MECHANISM.

APPLICATION FILED JUNE 9, 1911.

Patented Sept. 17, 19

4 SHEETS-SHEET 4.

COLUMBIA PLANOURAPH 60-.WASH1NGTON, D. c.

TED STATES PATENT UFFTQE.

:on wire c. rnnscorr, or oHrcAeo, ILLrnor-s.

Specification of Letters Patent.

Patented Sept. 1'7, 1912.

Application filed June 9, 1911. Serial No. 632,294.

or cant to the saw line or for throwing it from the carriage, and for receding the knees to receive a new log or cant.

The object of the invention is to provide power-actuated means for accomplishing these means, and particularly for control ling the action ofthis mechanism so as to;

accurately advance the log or cant the required distance, such mechanism to be simple of construction, easy of manipulation, and accurate in adjustment. These objects are attained in the structure hereinafter described and illustrated in the accompanying drawings, in which- Figure 1 is a detail plan of a saw-mill car riage with the improved mechanism-mounted thereon; Fig. 2 is a detail side elevation of the carriage showing the setting mechanism; Fig. 3 is a sectional detail on the line 3-3 of Fig. 1; Fig. 4 is a sectional detail on the line 44 of Fig. 1; Fig. 5 is a detail plan, partly in section, and with some of the parts broken away, of the controlling mechanism;

Fig. 6 is a sectional detail on the line 6-6 of 5; Fig. 7 is a sectional detail on the line 77 of Fig. 1; and Fig. 8 is a sectional detail of the quadrant and one of the stop pins forming a part of the controlling mechanism.

The carriage comprises the sills 15, 16, and suitable cross-sills, as 17. The headblocks, here shown as two in number, are represented at 18, 19, and, as usual, are located transversely of the carriage and project slightly beyond its forward side so as to just clear the saw line indicated at X. The usual knees 20 and 21 are mounted toslicle upon the headblocks, and 011 their under faces are provided with the usual gear-racks for meshing with pinions mounted upon the set-shaft 22 which is journaled in the base of the head-block.

A motor, shown as a common form of steam engine 23, is mounted upon the carr age, its shaft 24 being provided with a pinion 25, meshing with a gear-wheel 26 fixed upon the set-shaft 22, so that by driving the motor in either direction the knees may be advanced or receded.

A pinion 27 is loosely mounted on the shaft 22 and in fixed relation with a clutch member 28. A companion clutch member 29 is slidably mounted on the shaft 22, and is locked to the shaft, in order to rotate therewith, by means of a feather or spline 30. This slidable clutch member is controlled by the usual shipper yoke 31 and shipper lever 32., The pinion 27 meshes with a gear-wheel 33 fixed upon a shaft 34 carrying a worm-wheel 35. A vertical shaft 36 carries a worm 37, which engages the worm-wheel 35. Upon the upper end of the shaft 36 there is mounted a hand-erank 38. A pinion 39, fixed upon the shaft 36, meshes with a gear-wheel 40, rotatably mounted upon a standard 41 rising from and firmly set in the frame of the carriage, and to the upperfiat face of the gear 40 there is fixed a ratchet wheel 42. An arm 43 is pivoted upon the upper end of the standard 41 so as'to swing freely over the ratchet wheel 42, and carries a laterally projected curved or segmental arm 44. A rigid stop bar 45 extends from the standard 41 to a bracket 46 rising from the sill 16, and con stituting a part of the frame-work for carrying the worm-shaft 36 and other portions of the mechanism. The bar 45 is located betweenthe arm 43 and the ratchet wheel 42. The arm 43 is provided with a downwardly projecting boss 47, whlch limits the movement of the arm in one direction by its contact with the stop bar 45. A pawl 48, pivotally mounted upon the arm 43 and controlledby means of a hand-piece 49, cotiperates'with the teeth of the ratchet wheel 42, normally locking the arm and the ratchet wheel together in such manner that as the wheel is turned the arm is turned by the action of the worm. The boss 47 is carried toward the bar 45.

A plurality of adjustable positive stops,

as many as desired, are carried by the quadslidable therein, these pins being et -such"- length that they may be depressed so that,

they will make contact with the bar 45 when the arm 43 is moved'backward. Each of the pins 50 carries a laterally project-- ing stud 51, which is adapted to slide through a groove 52 extending-laterally from the aperture in the quadrant 44 within;

wh ich the pinis fitted. When the pin is not in service itis raised tobring the stud 51 abovethe upper face of the quadrant, and isthen turned to throw the stud out of register with the groove 52.

' The boss 47 hasa threaded aperture within which there is fitted a screw-bolt;53, having a knurled head 54, the end 55 of thesbolt being hardened, this bolt constitutin'g'an adjustable stop for engagement with the-bar 45. This bar ispreferably armored, as shown at 56, a piece of hardened steel being set in its face for engagement by the boss 47 or the end 55 of the bolt 53. V 1 When a log or cant is mounted upon the head-blocks the setter causes its advance the desired distance in the following manner:'

The motor 23 having its power applied to advance the knees, and the clutch member 29 being in engagement with the clutch member 28, the, worm-wheel .35 tends Ito rotate the worm shaft '36 but, is locked against movement by the worm 37, which is made of suitable pitch to secure this action.

Theoperator depresses one of the pins 50. These pins determine the limit of backward I movement of the arm 43. Let it be assumed that it is desired to cut from. the cant a board 1%ths inches thick. The operator depresses the pin designated. with this 1111 meral, as shown in Figs. 5 and 6; he then 40 releases the pawl 48 and swings the arm 43 back until this pin makes contact with the bar 45, whereupon he permits the pawl to again come into engagement with the teeth of the ratchet wheel 42. 7 By now rotating the shaft36 by means of the hand crank 38, he brings the boss 47 or bolt 53 into engagement with the bar 45, permitting the wormwheel 35, and consequently the set shaft 22, to be rotated sufiiciently to advance the knees the required distance.

In the manufacture of lumber it is sometimes desired to cutto the exact thickness specified, sometimes to cut the boarda little scant of the designated measurement, and sometimes to-cut it full or slightly in excess of the measurement specified. The boss 47 is so positioned that when its front face is relied upon to make contact with the bar 45 the lumber produced will be slightly in excess of the measurement indicated by the numeral on the stop pin 50. By advancing the bolt53 so that 1ts end constitutes the engaging member the range of movement of I'or. plank to be cut, whether mounted on a correspondingly reduced. The bolt 53 car ries, a lock nut 57 to enable the operator to eii'ect the adjustment of this limiting device and maintain it as fixed. -----The stop mechanism as described is for thepurposeof controlling the motor. 7 While thefconnections between the stop mechanism narid'the motor are shown as being through the set-shaft, and this form of construction is at present preferred,it isobvious that the scope ofthe invention is broader than this specific form of connection and that any means whereby the worm wheel and the stop mechanism associated therewith are connected with the motor, will secure the deso sired results. 1 Y f i Whilelthereis shown in the drawings as the means for connecting the set-shaft with the knees a gear-rack attachedto the bottom of the lmee and meshinglwith the pinion carried by the set-shaft, it is understood that the invention is applicable to otherforms of construction'j'in which the gearing for driving the'knees from the set-shaft is difierently organized. i 'i While the invention is shown in connection with thehead-blocks of asaw-mill carriagefit is applicable: to any setting device for determimng thethickn ess of the board carriage .or' otherwise arranged, or whether movement is imparted directly to 'the log or cant or to a table carrying the same or to the saw, the log or cant remaining the same plane as before. 1} 1C In sawing timber the knees may berapidly advancedby the motor 23 ,to discharge the finished stick from .the head-blocks by. manually separating the clutch members 28, f3

29. Preferably the clutch members 28, 29 10s are provided with inclined teeth, as shown, in order that when the motor 23 is reversed to recede the knees, these clutch members will automatically separate. I Iclaim as my invention 1. In a saw mill set works, in combination, a set shaft, a worm wheel, a motor for driving the set shaft and worm wheel, a worm shaft meshing with the worm wheel, a hand crank directly applied to the worm shaft, a ratchet, a train of speed reducing gears operatively connecting the worm shaft and ratchet, an oscillatable pawl arm driven in one direction by the ratchet and a positive stop for limiting the movement of the pawlarm in that direction. 7

, 2. Ina saw mill-set works, in combination, 'traveling knees, a motor for moving the, knees, a worm wheel driven by the 'motor, a worm shaft engaging the worm wheel, a hand crank, a ratchet, operative connection between the hand crank the worm shaft and .the ratchet including a pair of speed reduc- M the arm 43 is slightly reduced, and conse- 65 quently the thickness of lumber produced is ing gears whereby the ratchet is turned at a less rate than the hand crank andworm shaft, an oscillatable pawl arm driven in a ratchet Wheel driven by the Worm shaft, one direction by the ratchet, and a positive a pawl-arm driven by the ratchet Wheel, a 10 stop for limiting the movement of the pawl positive stop for the paw1-arm, and means arm in that direction. for manually turning the Worm shaft.

3. In a saw-mill set-Works, in combina- DE WITT C. PRESCOTT. tion, a set shaft, a motor for rotating the Witnesses: shaft, a Worm Wheel driven from the shaft, LOUIS K. GILLsoN, a Worm shaft meshing With the Worm Wheel, E. M. KLATOHER.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

Images