US1260974A - Saw-grinding machine. - Google Patents

Description

E. C. FILSTRUP.

SAW GRINDING MACHINE.

APPLICATION FlLED MAR. 11. I915.

Patented Mar. 26, 1918.

E. C. FILSTRUP.

SAW GRINDING MACHINE.

1,260,974. APPLICATION FILED MAR. I7, 195. Mar 26 ISHEETS-SHEET 2.

E. C. FILSTRUP.

SAW GRINDING MACHINE.

APPLICATION FILEDMAH. 17, 191:). Patented Mar. 26. 1918' 1 SHEETS-SHEET a.

. 7 f7. f6 I Z0 E. c. FILSTRUP. SAW GRINDING MACHINE.

. 1,260,974. I "memo" ma? MAR. 17. 1915. Patented Mar 26' 1918.

TSHEETS-SHEET 4- J20 (5 0/621? E g #11 E. c. FILSTRUP.

SAW GRINDING MACHINE.

1,260,974. APPLICATHJN FILED MAR-17,1915 Patented Rial 26,

7SHEETSSHEET 5.

"E. C. FIL STRUP.

SAW GRINDING MACHINE.

APPLICATION FILED MAR-17,1915.

Patented Mar. 26, 1918 YSHEETS-SHEET 6.

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SAW GRINDING MACHINE.

APPLICATION FILED MAR- 17- I915.

Patented Mar. 26. 1918.

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EDDIE C. 'FTLS TRUP, 0F BENTON HARBOR, MICHIGAN, ASSIGNOR '10 OOVEL MANUFAC- TURING COMPANY, OF BENTON HARBOR, MICHIGAN, .A. CORPORATION OF MICHIGAN.

SAW-GRINDING MACHINE.

ence to improvements in a machine of this character by which the operation of sharpening saws is accomplished automatically.

One of the objects of my invention is to provide a machine of this character which will be simple, durable and reliable in construction, and effective and efficient in operation. Other objects of my invention will appear hereinafter.

M invention consists in the features of novelty exemplified in the construction, combination and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims.

Referring to the drawings Figurel is a View in front elevation of a saw grinding machine, embodying my invention.

Fig. 53 is aplan' view of the structure shown in Fig.1, taken substantially on the line 2-2 of Fig. 6.

Fig. 3 is a left hand side elevation of the structureshown in Fig. 1.

Fig. 4 is a right hand side elevation of the structure shown in Fig. 1.

Fig. 5 is a view in rear elevation of said -machine, substantially on the line 5 5 of Fig. 2, some of the parts being shown in sectlon.

Fig. 6 is a view looking at the front of the machine, but with some parts removed or broken away or shown 111 section to more closely disclose the parts which th1s view 7 is more particularly intended to illustrate.

F 7 is an enlarged fragmentary front view of the grinding mechanism and saw feeding parts.

Fig. 8 is a plan View of the structure shown in Fig. 7 the grinding wheel being removed and its support being shown in section. r i a Fig. 9 is a detail of the gear shifting mechm through the medium of which :the saw Specification of Letters Patent.

Patented Ma1n26, 1918.

Application filed March 17, 1915. Serial No. 14,898.

supporting mechanism is raised and lowered by power from the pulley wheel shaft at the rear of the machine.

- It will be obvious to one skilled in the art, after having obtained an understanding of my invention from the disclosures herein made, that my invention is capable of modification w1thout departing from the scope and spirit of the claims, and I desire it to be so understood. The machine which I have illustrated in the drawings, and which I have chosen to illustrate my invention, is designed more particularly for the purpose of grinding or sharpening the teeth of large circular saws which are used in lumber mills and the like. This machine is arranged so that the circular saw may be fastened in position thereon and the machine will automaticallv position the teeth of the saw with respect to the grinding mechanism and operate to sharpen or grind these positioned teeth, these operations being carried out preferably in one continuous operation and at the maximum rate of speed under the particular conditions.

The machine shown in the drawings has a frame A upon which the saw and the operating parts are mounted. This frame, in general, is substantially rectangular in form, has four legs at its corners and a flat table or bed A at its top. At its front, the frame carries an adjustable saw carriage B. This saw carriage embodies a transversely positioned'beam or member 1 which is sup ported adjacent its ends by two vertically disposed threaded. shafts 52. positioned adjacent the two front legs of the frame and journaled in suitable bearings at their upper and lower ends. These threaded shafts operate in elongated correspondingly threaded sleeves 3 carried by the rear face of the carriage beam 1 so that by the rotation of these shafts in the proper direction the beam may be raisedand lowered, as desired, to adjust the saw with respect to the grinding mechanism. In the lower part of theframe is a horizontal shaft l connected by bevel gears 5, or otherwise, to the lower ends of the vertical shafts 2, whereby these shafts will rotate in unison in the corresponding direction to raise and lower the carriage beam 1. One of the shafts 2 at its upper end carries a suitable hand-wheel 6 by which the shaft maybe rotated to adjust the carriage. ,This provides. convenient means by which the finer degrees of vertical adjustment may be obtained after the saw riage has been raised or lowered to approximately the proper adjustment by power 5 mechanism, which I will now describe, The rear legs of the frame have outstanding arms 7 supported at their ends, the main driving shaft 8 carrying pulleys 9 which may be connected to any suitable source of 10 power for driving the machine. This shaft carries a loose pulley 9? adjacent pulley 9 so that the driving belt may be shifted to the pulley 9 A gear 10 is attached to and driven by the pulley 9. On the arm 7, adjacent the gear 10, is another bearing 11 carrying the short shaft of a gear 12, which is spaced from the gear 10. A triangular frame 13 is pivoted at one of its corners on the shaft of gear 12, and at each of its other corners carries similar gears 14;, which, by the pivotal movement of the triangular member 13, are adapted to be shifted into and out of mesh with the gears 10 and 12. Thus the gear 12 may be driven in either d1- rection, depending upon which of the gears 14L is shifted in mesh with said gears 10 and 12 The power in either direction from the gear 12 is transmitted forwardly to the hor1- zontal shaft 41 by a chain 16 which travels 39 around sprockets on said shaft 4; and on the shaft of gear 12. In this manner, the operator may throw one of the gears 14 into mesh with the gear 10 and thereby drive the vertical shafts 2 in the direction corresponding to the direction in which it is deslred to move the carriage beam 1. In this machine, I provide a bell crank lever 17 pivoted at one side of the table or bed of the frame. One arm of this bell crank is pivotally connected to a link 18 which is also connected to the traingular member 13 carrying the gears 14. The other arm of said bell crank lever is formed so as to be conveniently handled by the operator. On the 1. carriage beam 1 isa saw supporting block 19 which has a dove-tail sliding connection with the beam 1 for the purpose of horizontal-adjustment of the saw. This block is adapted to be moved in either direction along the beam 1 by a threaded horizontally disposed shaft 20 journaled at its ends in suitable bearings on the beam 1. This shaft passes through and is in threaded engagement with suitably threaded bore in the 5 5 block 19 for this purpose. The shaft 20 may be rotated in any suitable manner; and

in this construction I have shown a short shaft 21 connected with the shaft 20 by the bevel gears 22, and disposed at right angles to the shaft 20 so that a hand crank may be attached to the rear end of the shaft 21 for purpose of rotating the shaft 20. This particular driving arrangement provided,

t is. ma ine, $0 h t in he event that the a PQEQQMQF n bass sw n is Qelarg si and extends beyond the end of the carriage beam, it will not interfere with the operation of the adjusting crank. supporting block 19 extends somewhat above the beam 1 and at its upper end carries a hollow circularhead or member 23 into which is threaded a large bushing 24:. This bushing,

as seen clearly in Fig. 4, forms a flat face against which the saw to be ground may be positioned, and it is threaded into the cir cular member 23 so that it may be adjustable to position the periphery or toothed edge of the saw accurately with respect to thegrinding mechanism, thus allowing for different sizes and thicknesses of saws. .Outstanding from the center of this circular member and rigidly fastened thereto is a threaded 'stud25 which is intended to pass through the central hole generally found in saws of the circular type, and also to provide means for holding a couple of clamping nuts 26 by which the saw may be firmly and positively clamped against the face of the bushing 24c, and still permit the rotation of the saw when it is being fed to the grinding mechanism. In the lower part of the frame is a horizontal. shaft 27 extending from front to rear of themachine, and pivotally mounted on this shaft toward the rear 7 of the machine is a long arm or member C,

which, for convenience, I term the saw feed ing arm. This feeding arm, as shown more particularly in Figs. 1, 3 and 6, extends diagonally upward. toward the front of the frame,and just below the bed plate A of said frame, it turns verticallyand passes up through the suitable slot or opening in said bed plate A This feeding arm carries at its upper end a feeding head, and isadapted to be oscillated or reciprocated .about its pivot point on the shaft 27 to feed the saw in a step-by-step movement with respect to the grinding mechanism. This feeding arm carries a slidable bearing block 29 having a dove-tail or other suitable connection with the arm C so that it may be vertically shifted along said arm. The bearing block carries an anti-friction roller 30 which is eccentri-. cally mounted for the purpose of adjustment to take up the wear on the parts. and which bears against a shorter arm 31. This shorter arm is pivotally mounted at its lower end on a shaft 32 and is rocked about its pivot by a cam 33 against which it bears at its upper end portion. The arm or lever 31 carries an anti-friction roller 34 which actually takes the thrust from the cam and which is ecccntrically mounted so that it may be ad justedto take up the wear on the parts. The cam 33, which for convenience I term afeedmg cam, is carried on a shaft 35, which car rise at its rear end a bevel gear 36 through the medium of which it derives power from another. shaft 37 horizontally positioned at the.reauoftl1e frame, the shaft 3-7 having a bevel pinion 38 which meshes with and drives the bevel gear 36. This shaft 37 derives its power from the main shaft 8 through the medium of a belt 39 which passes around pulleys 40 and 41 on the respective shafts. The cam 33, acting through the auxiliary arm 31, the bearing block 29 and the main feeding arm C, determines, so to speak, the stroke or throw of the upper end of the arm 0. The shape of the cam thus determines the approximate adjustment of the feeding arm 0, and by. employing difi'erent shaped cams the proper operation of the feeding arm for any particular type of sawtooth may be determined. Accuracy of. adjust ment, however, in a machine of this character is an essential function, and the finer adjustments to meet this requirement are accomplished through the arrangement of the arms and bearing block. The bearing block 29 is shiftable toward and away from the pivotal points of the auxiliary and main arms, 31 and C respectively. For instance, as the point of contact of the bearing block with the auxiliary arm 31 approaches'the pivotal point (the shaft 32) of saidauxiliary arm, the less would be the movement imparted to the bearing block. Thisdecreased movement of the bearing block is, of course, imparted to the bearing arm C. The shifting of the bearing block toward the pivot of the arm 31 also shifts it closer to the pivot of the arm O, and the movement of the upper end of the arm 0 would ordinarily be amplified. But this increase of movement of the upper end of the arm'C is more than ofiset by the decrease of movement im-.

parted to the bearing block by the auxiliary arm 31, hence the nearer the bearing block is to the pivotal points of the arms 31 and G, the less will be the range of movement of the upper or saw feeding end of the arm 0.

In this manner the shifting of the bearing block relatively to the pivots of arms 31 and O determines with extreme accuracy the throw or adjustment of the saw-feeding parts at the upper end of the arm C, Amy suitable means may be employed for shifting the bearing block. The feedlng arm 0, of course, is positively moved on its forward or feeding stroke by the cam 33, but

on its return stroke it is moved by means of a spring C one end of which is anchored to an outstanding arm on the frame, and the other end of which is fastened at C on said arm C. In the present structure I have shown a threaded shaft 42 passing through a suitably threaded sleeve on the bearing block 29 and also journaled in a fixedbean ing 43 near the upper end of the arm 0. This shaft may be rotated in either direction by a hand wheel 44 positioned at the upper end of the feeding arm 0 and connected to the threaded shaft 42 by means of the shaft i5 and the universal joint 4:6 (see Fig. .3).

The saw, a portion of which is indicated in Figs. 6, -7 and 8 by the dotted lines 50, is positioned so that its periphery or toothed edge projects slightly above the top of the bed plate A of the frame so that its teeth will be in position to be engaged by a feeding pawl 51 carried by the upper end of the feeding arm C. This feeding pawl is carried on the end of an arm 52, which, as shown more clearly in Fig. 7 is pivoted on a block 53 which isslidably mounted in a suitable guidewayin the upper end of the arm C. This block may be adjusted by a threaded member 54: having a hand-wheel By this construction the range of movement of the feeding pawl may be shifted so that it will accurately position the teeth of the saw with respect to the grinding wheel 1). This feeding pawl has a forwardly turned end 56 which, as clearly shown in Fig. 7, is adapted to successively engage the teeth of the saw and rotate the saw about its center, a tooth at each step or stroke. In order to prevent the pawl from feeding too far, the end of arm 52 is arranged to engage a limit stop 52 on its forward stroke. This stop is carried on the end of a shank which is slidably mounted in a guideway 52". The rear end 52 of said shank is beveled and is arranged to be engaged by an inclined adjusting bolt 52. having a hand-wheel 52 by which it may be manipulated. Thus by 0perating the hand-wheel 52 the limit stop 52 may be accurately positioned or adjusted, as desired. It is adapted, when on its forward or feeding stroke, to rest of its own weight in engagement with the teeth of the saw, but on its return stroke the pawl is lifted outof engagementand free from the teeth so as not to drag over the teeth and dull them. In this construction, the pawl is lifted on its return stroke by an arm '57 (see Figs. 3 and 7 one end of which is fastened to a shaft 58 on the top of the bed plate A, and the other end 59 of which is curved to present a curved bearing surface to the underside of the pawl 51 and lift said pawl. This arm is actuated by a suitable cam 60 on the shaft 35, through the medium of the arms 61 and 62. The arm 61 is pivotally mounted at its upper end on the shaft 58, and carries at its lower end an anti-friction roller which rides on a cam 60. The arm 62, however, is keyed to the shaft 58 so as to operate the lifting arm 51, and it receives its movement from the arm 61 through the bearing screw 63, this screw 63 being carried in the lower end of the arm 62 which is curved around and positioned in the path of the arm 61. This construction provides a convenient adjustment between the arms 61 and 62, so that the operation of the lifting arm 61 may be carefully controlled.

The grinding mechanism is supported or mounted upon a frame or carriage 65 which is shiftable or slidable up and down in a suitable support or guiding structure 66 upstanding from the bed plate of the machine, a portion of this guiding structure depending below the bed plate of the machine.

This grinder carriage is reciprocated or osframe and forming a pivot for said lever.

This lever curves generally downward so that its other arm occupies a position substantially horizontal in the lower portion of the frame beneath the grinder carriage. This arm carries a sliding block 70 pivotally connected to a link 71, the upper end of which is pivotally connected to the lower end of the grinder carriage, so as to transmit motion from the operating lever E to the grinder carriage. The arm of the lever E, which carries the block 70, is curved on an arc, the center of which is substantially the pivotal point of connection of the link 71 with the grinder carriage, and by shifting the block 70 along the arm to vary the distance between itself and the pivotal center 69 of the lever E the length of stroke of the grinder carriage may be accurately governed. The actuation of the block 70, for the purposes of this adjustment, is accomplished by a threaded shaft 72, which is position for connected by a universal joint 7 3 to the end of another shaft 74. This shaft 74: is journaled in bearings 75 on the lever E and carries at its outer end a hand-wheel 76 by which it may be manipulated by the operator, the reason for this universal joint connection between the shafts 74: and 72 being to place the hand-wheel 76 in a convenient the operator. The grinder wheel D may be of any suitable type for the purpose. In this construction it is carried on a horizontal shaft which is journaled in a suitable bearing 77 on the end of a depending arm 78. The grinder wheel shaft also carries a suitable pulley 7 9 over which the belt 80 passes for driving said grinder wheel. The'supporting arm 78, which carries the grinder wheel, rises to a point above the grinder wheel and then turns horizontally and carries a vertical shaft which is journaled in a vertically disposed bearing 81 mounted on the grinder carriage so that the grinder wheel may be swung or moved bodily to position the grinder at the proper angle with respect to the teeth of the saw.

In saws of the character which this machine more particularly designed to sharpen, th faces, of al ernate t eth. are cut on the same angle and the intermediate; teeth are cut, on the opposite angle,- and the purpose at cf thi z en trueti n is ta enable. the, grinder Wheel to be positioned to cut or sharpen the teeth at these angles. In this construction the grinder is alternately turned to the proper angle for the teeth, and this turning or positioning of the grinder occurs before the grinder is brought down by its carriage to the cutting position, these partsbeing all properly timed with respect to each other. The rocking of the grinder supporting arm 7 8 to position the grinder at the proper angle with respect to the plane of the saw is accomplished through the medium of two segmental gears 82 and 83 which are constantly in mesh. These gears are, asshown in the drawings, comparatively broad faced so that they will always remain in mesh and still permit a considerable relative movement vertically of the grinding wheel carriage. The gear 82 is carried on the grinding wheel supporting arm 78, while the gear 83 is carried at the end of a horizontally swinging arm 84, the pivotal shaft of which is journaled in a bearing post 85 upstanding from the bed plate of the machine. This shaft extends below the bed plate and carries at its lower end another arm 86 by which the gear 83 and its supporting arm 84;

nected by a pin and slot connection 88 to an arm 89. This pin and slot connection 88 permits an adjustment of the link 87 with respect to the pivotal center of the arm 89 so that the length of stroke of the link 87 may be conveniently adjusted. This arm 89 is carried on a hub 90 mounted to rock on a depending stud on the underside of the bedplate. This hub carries another arm 92 havingat its end a follower 93 adapted to "travel in the double grooved cam 94 on the cam shaft 35. The grooves 95.-of this cam cross each other at a certain point in the periphery of the cam so as to impart a rocking movement to the arm 92 and this motion is transmitted through .the mechanism just described to the grinder wheel; The arm 92, which carries the follower, is made in several pivoted sections so that thefollower may be swung up out of the cam groove when the cam is to be changed. The grinder carriage also carries an upstanding bracket 96 upon which are mounted a-pair of pulleys 97 for maintaining the belt 80 in proper position relatively to the griding wheel pulley 79. These pulleys 97 are supported on comparatively long studs 98 outstanding from the bracket 96 andpermit- 'in which the grinding wheel pulley is placed during the operation of the machine. The

belt. 80: passes around and is driven by a large, pulley 99. on; shaftlOQ which is sup.-

' ported by upstanding brackets 101 on the rear of the machine frame, and said belt 80 is maintained at itsproper tensionduring the operation of the grinding mechanism by an idler pulley 102 which rests in a bight of the belt and which is carried on the end of an arm 103 pivoted on the shaft 100. The shaft 100 also carries another and smaller pulley 10 1 which is driven by a belt 105 extending downwardly and around a main driving pulley 106 which is carried by the main shaft 8. i

. The particular saw which is being sharpened is, as before mentioned, positioned with its teeth slightly above the head plate of the frame. The teeth of the saw being at considerable distance from the center of the saw, which is solidly supported, would be likely to result in considerable vibration of the saw during the grindingoperation, were it not for the fact that I provide mechanism which operates to firmly grip the saw at its toothed edge adjacent the portion being operated upon by the grinding wheel. In this construction, I provide underneath the frame a long. arm 110 which is pivoted to the frame at 110 One end of this arm .car

ries a small adjustable button 110 which the frame.

This adjusting rod 110 is mounted ina suitable threaded'bearing on the underside. of

.the frame and has a hand wheel 110 by which it may be manipulated. On the opposite side of the saw is a long arm 111 which is pivoted at 112 at the far corner of The free end of this arm has a flat-headed adjustable button 113 which is adapted to be clamped against the saw and in turn to clamp the saw against thebutton 1l0".to firmly hold the .saw in place. The

clamping action of this arm is attained by a cam 114 rotatably mounted adjacent the pivot 112 of said arm a'ndacting against a short extension 115 on said arm. This saw clamping mechanism is of sufficient length to permit the largest, as well as the smallest saw, within the range of the machine to be held in place, and its operation is such that it firmly holds-the saw against vibration,

and at the same time permits the saw to, be rotated step by step by the feeding mechanism. This mechanism thus makes a very accurate adjustment of the saw with respect to the grinding wheel and at the sametime provides a very rigid clamping means which rigidly holds the saw against vibration without interfering withthe rotation of the (bee Figs. 7 and 1 It will thus be observed from the foregoing that I have provided a machine which is readily and conveniently adjustable in all of its parts, and which, by reason of the arrangement and adjustability of its parts, is capable of being used for a wide range of saws, including various sizes and thicknesses and the character of the teeth. Practically the only parts which need to be changed for dilferent species of saws are the cams, and it will be particularly noted that these cams are, for this reason, mounted upon a single readily removable shaft positioned at the side of themachine near the top thereof, so as to be readily and conveniently accessible to the operator, this being in contradistinction to the present machines now on the market in which the cams are located within the frame in the lower portion thereof, making it diflicult and tedious to remove or replace the cams when desired. Furthermore, in my present invention the cams are mounted at the upper side of the machine so that they will not be subjected to the filings or grindings' which fall from the grinder wheel. But as a further precaution, I pro: vide a chute F on the grinder carriage supporting frame 66, this being in position to receive the grindings from the grinder wheel and convey them downwardly beyond the reach of the operating mechanism of the machine.

What I claim as my invention is:

1. The combination of a frame, saw supporting means thereon, a reciprocating carriage, a grinder wheel carried thereby and arranged for movement on a vertical axis to present the grinder at different angular positions with respect to the saw, a pair of gears constantly in mesh while the carriage reciprocates forplacing the grinder wheel in its difierent positions, one of said gears being connected with said carriage and means for actuating the other gear.

2. The combination of a moving carriage, a grinder wheel, a supporting member for said grinder wheel mounted on and movable with said carriage, a broad-faced gear carried by said supporting member, a second broad-faced gear meshing with said first gear, and means for actuating said second gear to transmit motion to the first gear and supporting member While the carriage moves.

3. The combination of a reciprocating carriage, a rotary arm on said carriage, a grinder wheel carried by said arm, a broadfaced gear connected with said arm, a second broad-faced gear meshing therewith for transmitting rotary motion to said arm, and means for actuating said second gear.

4:. The combination of a saw supporting mechanism, apair ofpivoted arms, means for actuating one of said arms, a bearing member shiftable relatively tobothof said.

arms for transmitting motion from said actuated arm to the other arm, and means carried by said other arm for rotating the saw upon its support.

5. The combination of means for support ing a saw for rotary movement, a movable member, a pivoted arm, a member for transmitting motion from said movable member to the arm and'shi'ftable relatively to both said member and arm toward and from the pivot point of said arm to vary the degree of movement imparted to the arm, means for actuating said movable member, and means carried by said arm for engaging the teeth of the saw to rotate the saw.

6. The combination of a reciprocating feeding mechanism, and means for actuating said feeding mechanism, comprising a pair of pivoted arms, means for oscillating one of said arms about its pivot, and a bearing member for transmitting motion from said oscillated arm to the other arm and shiftable longitudinally toward and from the pivotal points of both of said arms to vary the degree of movement imparted to the said other arm.

7 The combination of a reciprocating feeding mechanism, a pivoted arm connected at one end to said reciprocating mechanism, a shorter pivoted arm, a cam for osclllatmg said shorter arm, and a bearing block for transmitting power from the shorter arm to the longer arm, and means for shifting the bearing block longitudinally of said arms relative to the pivotal centers of both of said arms to vary the degree of reciprocation of said reciprocating mechanism.

8. The combination of a frame, a cam shaft supported by said frame at the upper side thereof, a saw supporting mechanism,

an upright arm substantially below the top of said frame pivoted at its lower end and having means at its upper end for periodically rotating said saw, a cam on said shaft for actuating said arm, a grinder mechanism and a carriage for vertically reciprocating said grinder mechanism, actuating mechanism below said frame top for reciprocating said carriage, and a cam on said shaft for driving said actuating mechanism.

9. The combination of a frame, a saw feeding mechanism substantially below the top of said frame, a saw grinding mechanism above the top of the frame, mechanism for positioning said saw grinding mechanism located beneath the top of the frame, a single shaft mounted at the side of said frame but beneath the top thereof in a conveniently accessible position, a plurality of removable cams on said shaft for actuating said mechanisms, and means for driving the shaft. 7 i

10; The combination of a frame, a beam supported on said frame,means for raising and lowering said beam vertically, a block shiftable horizontally on said beam, a saw supporting device carried by said block and adjustable at rightangles to said vertical and horizontalmovements of said beam and block.

11. The combination of a frame, a horizontal beam mounted and movable verti cally on said frame and having means for supporting the saw, mechanism for raising and lowering said beam, a source of power, and a reversible clutch for connecting said mechanism with and disconnecting it from said source of power.

12. The combination of a frame, a hori zontal beam having a horizontally movable saw support thereon, threaded shafts supporting said beam and adapted to be rotated to bodily raise and lower the beam, a main shaft, manually controlled mechanism for transmitting power from themain shaft to said threaded shafts, and means for moving thesaw support on the beam.

13.' The combination of a frame having saw supporting means, andsaw clamping mechanism for gripping the saw adjacent its periphery and embodying a long arm pivoted at one 'end, and a cam acting against said arm at its pivoted end to press the free end of the arm against the saw.

14. The combination of saw supporting mechanism, a reciprocating member, a pawl carried thereby and adapted to engage the teeth of the saw on the forward stroke, a

pivoted lever for raising the pawl clear of the teeth on the return stroke, a cam-actuated arm, and means for relatively adjusting said lever and arm for operating said lever.

15. The combination of saw supporting mechanism, a reciprocating member, a pawl carried thereby and adapted to engage the teeth of the saw on the forward stroke,a lever engaging said pawl, and cam mechanism timed to actuate said lever and raise the pawl on the return stroke thereof.

16. In a saw grinding machine, the combination of av frame, a vertically reciprocating grinder carriage extending above said frame, a grinder mounted on said carriage, mechanism for moving the grinder about a vertical pivot to position it with respect to the saw, an oscillating mechanism for rotating the saw with respect to the grinder, said mechanism extending substantially below the top of the frame, mechanism located entirely below the topof the frame for bodily reciprocating said carriage to move the grinder vertically, a cam shaft located at one side of the frame near the top thereof, a plurality of removable cams on said shaft for actuating said mechanisms, and a source of power connected to said cam shaft for drivin 'the same. V

17. n a saw grinding machine, the combination of a frame, saw grinding mechanism mounted thereon, means supporting end a pawl for engaging the saw teeth, a-

second lever pivoted. at one end and disposed in juxtaposition to said first mentioned lever, a cam engaging the other end of said second lever to oscillate the same about its pivot, and a bearing block positioned between the levers and adjustable lengthwise of both levers for transmitting the oscillating movement of the second lever to the first lever.

18. In a saw grinding machine, the combination of a frame, a saw supporting device, a saw grinding mechanism disposed in the upper portion of said frame, an oscillatinoarm pivoted in the lower portion of saith frame and extending upwardly to the top thereof, a pawl carried by the upper end of the arm for engaging the saw teeth, a cam actuated arm pivoted at one end, a slidable bearing block on the oscillating arm engaging the cam actuatedarm, and means for adjusting the bearing block on the said oscillating arm toward and from the pivotal points of both of said arms to regulate the stroke .of the pawl carrying oscillating arm.

19. In a saw grindingmachine, the combination of a frame, a support for the saw, grinding mechanism for the saw,a pair of juxtaposed arms pivoted at corresponding ends to said frame, cam mechanism for oscillating one of said arms, a member for transmitting the motion of said arm to the other arm, means for shifting said member longitudinally of both arms and relatively to the pivotal points of both arms to regulate the stroke of said other arm, and a pawl on said other arm for rotating the saw relatively to the grinding mechanism.

20. In a saw grinding machine, the combination of a frame, a vertically reciprocating grinder carriage at the top of said frame, a lever pivoted in the lower portion of the frame and having one of its arms disposed generally horizontally and its other arm extending generally upwardly, a pitman pivotally connected to said carriage and to the horizontal arm of said lever, means for adjusting the connection of said pitman with the lever toward and from the pivotal point of said lever to vary the stroke of the reciprocating carriage, and cam mechanism actuating-the .other arm of said lever and located in the frame at one side thereof near the top.

21. In a saw grinding machine, the combination of a frame, a vertically reciprocating grinder carriage, grinder mechanism supported on said carriage and vertically movable therewith and mounted to turn about a pivotal axis to change the angular relation of the grinding mechanism with respect' to the saw, a segment gear on said grinding mechanism vertically movable therewith, a segment gear on the frame, said gears being in mesh and having their teeth disposed parallel to the vertical movement of said grinding mechanisrmand means for actuating said second gear.

Signed by me at Chicago, Illinois, this 26th day of February 1915.

EDDIE G. FILSTRUP. Witnesses:

H. S. BEAUBIEN, E. H. CLEGG.

Boplcn of this patent may be obtained for five cents each, by addressing the Commissioner of Patenta,

Washington, D. C."

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