US928332A - Saw-sharpening machine. - Google Patents

Description

a; H. ROBINSON.

SAW SHARPENING MACHINE. APPLICATION run our. 14, 1991.

928,332; Patented Jul y20, 1909.

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G. H. ROBINSON. SAW SHARPBNING MAGHINE. APPLICATION FILED OUT 14, 190'].

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Patented July 20,1909.

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H. ROBINSON. SAW SHARPENING MAGHINE. APPLICATION FILED 001214, 1907.

928,332. I Patnted July'20,1909.

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WTNESSES" I r I? i 60, flg ii E Zfiw4mwu cl W flamk/z UNITED STATES PATENT OFFICE.

GEORGE H. ROBINSON, OF SEATTLE, WASHINGTON.

SAW-SHARPENING MACHINE.

To all whom it may concern:

Be it known that I, Gsonon H. RoBINsoN, a citizen of the United States of America, and a resident of the city of Seattle, in the county of King and State of V'Vashington, have invented certain new and useful Improvements in Saw Sharpening Machines, of which the following is a specification.

My invention has for its primary objects the provision of an improved machine of the above character in which either straight edged or circular saws can be fed in an efficient manner relatively to the grinding means so that the teeth of the saw to be sharpened can be presented successively for sharpening.

\Vith the above and other objects in view, to be referred to as the description progresses, the invention resides in the features of construction, combinations and arrangement of parts hereinafter described and succintly pointed out in the appended claims.

Referring now to the accompanying drawings in which like nume'als of reference indicate like parts throughout the several views: Figure 1 is a view in top plan of my in'iprovcd saw sharpening machine. Fig. 2 is an end elovatiml thereof, parts being broken avay. Fig. 3 is a fragmentary view in top plan with parts removed, illustrating more particularly the mechanism for imparting a step by step movement to the saw. Fig. is a vertical cross sectional view of the construction illustrated in Fig. 3, taken on line l4t thereof. Fig. 5 is a fragmentary end elevation of a portion of a machine and illustrating the same arranged for sharpening circular saws, parts being broken away. Fig. 6 is a fragmentary top plan view on enlarged scale of the construction shown in Fig. 5, parts being broken away, and Figs. 8 and 9 are detail views.

My improved machine comprises a main frame, as 1, which can be supported in any desired manner. I have, however, illustrated the same as having a base 2 at one side through which bolts or the like can be passed for securing said frame in position on a bench or the like.

Reference numeral 3 indicates a swing frame, pivoted to frame 1 by a pivot 4%, for horizontal swinging, and having a dependiug threaded stud 5, projecting through a curved slot 5" of frame 1, and provided on its projecting end portion with a nut 6 through the medium of which said swing Specification of Letters Patent.

Application filed October 14, 1907.

Patented July 20, 1909.

Serial No. 397,437.

frame can be secured in its adjusted position. Reference numeral 7 indicates a track on which the saw carriage 9 is slidably mounted, said track being secured to arms 8 of a plate 8. Saw carriage 9 is provided with a suitable saw holder 10, formed of telescoping sections, whereby to accommodate saws of various lengths, as is apparent, the respective sections of said holder being conveniently held from accidental movement by a screw 11. The outer end portions of the sections of holder 10 are bent at substantially right angles toward frame 1, as at 10, and one of the said portions 10 is further bent, as at 10", and provided with a pin 12 which is fitted in an aperture in the end portion of the saw 13. The opposite end portion of saw 13 is engaged with a pin, as shown, provided on a spring clip, 15, removably held on the adjacent end portion 10 of the saw holder. Saw holder 10 is supported on carriage 9 at one end by a rest 16, having its lower end notched to freely straddle said carriage, and at its other end by a support 17, in the form of a clamp. Support 17 is slid ably mounted in a U-shaped frame 18, fixed to outwardly projecting lugs 18 of carriage 9, for movement longitudinally of the carriage, and is connected with a suitable adjusting screw 19 which when operated will move the saw holder on carriage 9 thereby enabling the operator to properly aline the teeth of the saw 13 relatively to the edge of the grinding wheel.

Reference numeral 20 indicates a lock nut for securing support 17 in a rigid manner after it has been adjusted.

The grinding wheel, indicated at 21, is fixed to an arbor 22, journaled in bearings provided on the frame 23.

Plate 8', see Fig. 1, is secured by screws as illustrated to the slidable bar 25, of suitable length mounted in uprights for feeding the saw to and from grinding wheel 21, said bar in the present embodiment being provided at its outer end with a handle 25 Acting conjointly with the bar 25 and operated by and during movement thereof is a pawl or member 26 for imparting a step by step movement to the saw so that the teeth of the saw will be successively presented to the grinding wheel. Said member 26 is supported at one .end for vertical rocking and horizontal swinging between flanged clips 27 on a depending support 28, and has its free end portion formed with a cam cc ge surface 26, adapted to engage an abutment 29 on said swing frame, during forward movements of bar 25 and be thereby swung on support 28 to the position indicated in dotted lines in Fig. 3. Said member 26 is provided with dogs 30 which during forward movement of said member engage the teeth of a toothed bar 31, secured to carriage 9, and said member 26 swinging by reason of its cam portion' 26 engaging and moving part abutment 29, effects a lateral feeding of the carriage to bring another tooth of the saw into position to be acted upon by the grinding wheel.

I preferably term the toothed bar or member 31 a pattern, for the spacing of the teeth thereof must correspond exactly with the spacing of the teeth of the saW to be sharpened, except of course, when a saw to be sharpened has teeth which are exactly twice the width of the teeth of the pattern. The mechanism for advancing the saw step by step can be adjusted so that the dogs 30 will skip a tooth of the pattern during each operation of member 26 and thereby effect the proper feeding of the saw, and the pattern is therefore removably secured to the carriage as by screws 31. A spring 32 returns the member 26 to its normal position as bar 25 is retracted, the dogs 30 during such movement riding over the backs of the next teeth.

Adjustable stops 33, 33 are provided on the bar 25 for limiting the movement thereof.

The under surface of the forward end of member 26 is slightly curved (see Fig. 2) and rides over a guide 34 so as to be moved upward slightly when approaching the end of its inward travel so as to cause the carriage to bind slightly on its track and thereby prevent any play between the parts during the sharpening operation, the upward pressure of the member 26 being transmitted to said carriage by the dogs 30 and pattern 31, as is obvious. Further by this construction the dogs are positively held against lowering, thereby preventing acci dental slipping of the carriage. Guide 34 (see Fig. 2) which is rotatably supported has an eccentric body portion. Wings 35 are provided on one end of guide 34 through the medium of which the operator is enabled to turn said guide and thereby adjust the same to vary the degree of upward movement of the free end portion of bar 26, as will readily be understood.

Reference numeral 36 indicates a rest pro vided on plate 8 directly in front of the grinding wheel, on which the saw bears and slides over during the operation of present ing new teeth to be ground. A guide 37 extends over rest 36 and is adapted to engage the upper face of the saw and firmly hold the saw against rest 36 so as to prevent backward movement thereof. Guide 37 is .25 respectively. A threaded stud 38, fixed 'on a bracket 39, on plate 8 (see F ig. 2) projects through an approximately centrally ar ranged opening in the said guide 37 and is provided with a nut &O which can be adjusted to vary the pressure exerted on the saw.

Grinding wheel 21 which. has its edge formed to fit between two teeth and simultaneously sharpen the rear edge of one and the forward edge of the other, has power transmitted to it by a chain 41 which. passes over the sprocket wheels 42, 42 the former of which is fixed to a drive shaft 43 to which power can be transmitted, as by a chain (not shown) passing over sprocket wheel 44. Sprocket wheel 42 is fixed to arbor 22. Chain 41 also passes over a suitable idler a5 journaled in a swing arm 46 which enables any slack in the chain being removed. Frame 23 is also preferably swingingly mounted on frame 1 so that arbor 22 can be raised or lowered as desired.

In operation after the saw 13 has been properly secured in the holder 10, and the set screw 19 adjusted to properly aline the teeth with the edge of the grinding wheel, the operator adjusts swing frame 3, such adjustment depending on the degree of pitch to be given the teeth, then grasping the handle 25 forces the bar 25 inwardly toward the grinding wheel until stop 33 strikes the adjacent upright 25 at which time the saw should have been advanced into engagement with the grinding wheel. During this in ovement of the bar the member 26 has adjusted the saw as previously described and upon retraction of the bar 25, which is assisted by a spring a7, said member 26 is forced by spring 28 over the backs of the next teeth of the pattern into position for presenting the next tooth of the saw.

In the foregoing I have described the construction particularly adapted for sharpening band saws, meat saws and the like and I will now proceed to describe the construction as arranged for circular saws.

The track, saw carriage, plate 8 and guide 37 are removed and a support 48 is ournaled vertically in an opening 48, formed in the bar 25 (see Figs. 3 and 5), said support being provided on its upper portion with a shoulder on which saw 49 is secured as by a nut 50. Support 48 is provided on its lower portion with a circular toothed element or pattern 51 with which is engaged one of the dogs 30 of the member 26, the other of said dogs being preferably removed when operating on a circular pattern.

The operation of the machine when provided with either the straight or circular pattern is, in so far as moving the saw to and from the grinding means and advancing the saw tooth by tooth, substantially the same.

A spring 52 exerts a yielding downward pressure on the pattern and prevents backward turning thereof.

In lieu of plate 8, another plate as plate 8 having a saw rest 53, is substituted. (See Fig. 5.)

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is

1. A saw sharpening machine comprising a grinding means, a carriage supported for movement toward and from said grinding means, means on said carriage for holding the saw, a toothed member fixed to said carriage, a member pivoted to said carriage and provided with a dog engaged with said toothed-member, and means relative to which the carriage is movable and adapted to swing the member.

2. A saw sharpening machine comprising a grinding means, a carriage movable toward and from said grinding means, saw supporting means on said carriage and being movable to present the teeth of a saw successively to said grinding means, a toothed-member secured to said saw supporting means, a member pivoted to said carriage and provided with a dog engaged with said toothedmember to move the same, and means relative to which the carriage is movable and adapted to swing said member.

3. A saw sharpening machine comprising a grinding means, a carriage movable toward and from said grinding means, saw supporting means on said carriage, a toothedmember secured to said saw supporting means, means for moving the saw supporting means pivoted to said carriage and provided with a dog engaged with said toothed-member, means relative to which the carriage is movable and adapted to swing the said means for moving the saw supporting means, and means for returning said means for moving the saw supporting means to its normal position upon retraction of said carriage.

4:. A saw sharpening machine comprising a grinding means, a carriage movable toward and from said grinding means, a saw carrier supported on said carriage and being movable in a direction laterally of said grinding means, a toothed-member fixed to said saw carrier, a means for moving the saw carrier pivoted to said carriage and provided with a dog engaged with said toothed-member, means relative to which the carriage is movable and adapted to swing the means for moving the saw carrier, and means whereby the inner end portion of said means for m0ving the saw carrier is elevated during movement of said carriage toward said grinding means.

5. A saw sharpening machine comprising a grinding means, a carriage supported for movement toward and from said grinding means, a saw holder thereon and being movable independently of said carriage, a toothed-member secured to said saw holder, means for moving the saw holder pivoted to the carriage and provided with a dog in engagement with said toothed-member, said last means having a cam portion, an abutment arranged to be engaged with said cam portion, whereby the said last means will be swung during movement of the said carriage, and means for returning said last means to its normal position.

6. A saw sharp tning machine comprising a grinding means, a carriage supported for movement toward and from said grinding means, a saw holder on said carriage and being movable with the carriage and being supported for movement independently thereof, a toothed-member secured to said saw holder, means for moving the saw holder pivoted to said carriage and provided with a dog engaged with said toothed-member, means whereby said means for saw holder is swung during movement of the carriage with the dog engagedwitli said toothed-member, the under surface of the forward portion of said means for moving the saw holder being curved, and a guide over which the forward portion of the means for moving the saw holder moves.

Signed at Seattle,VVasliingto11, this 1st day of October 1907.

GEORGE I-I. ROBINSON. Witnesses JOHN FILKINS, SARAH B, FOLEY.

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