US359133A

US359133A - Saw-sharpening machine

Info

Publication number: US359133A
Authority: US
Publication date: 1887-03-08
Anticipated expiration: 1904-03-08

Description

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SAW SHARPENING MACHINE. No. 359,133. Patented Mar. 8, 1887.

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.M. OOVEL. SAW SHARPE-NING MACHINE.

No. 359,133. Patented Mar. 8, 1887.

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SAW SHARPENING MACHINE.

No. 359,133. Patented M51128, 1887.

UNITED STATES PATENT OFFICE.

MILO OOVEL, OF CHICAGO, ILLINOIS.

SAW-=SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 359,133, dated March 8, 1887.

Application filed November 16, 1855. Serial No. 1 3,020. (No model.)

To all whom it may concern:

Be it known that I, MILO COVEL, ofGhicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Saw-Sharpening Machines, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being had to the accompanying drawings, forminga part of this specification.

This invention relates to improvements in that class of machines set forth in. my Letters Patent No. 819,794, issued on the 9th day of June, 1885; and it consists of certain novel features'in the construction, combination, and operation of parts, as will be hereinafter set forth.

Figure 1 is a front elevation of a machine embodying my improved features; Fig. 2, a plan View of a part of the machine; Fig. 3, a partial side elevation; Figs. L and 5, sectional details; Fig. 6, a View in perspective of an ad justable compound cam; Fig. 7, a detached portion of the same, and Fig. 8 a sectional elevation of the same.

Referring to the drawings, A represents the frame-work supporting the different parts; A, the main drivingshaft,placed on the back part of the frame and supported on the standards a a a"; and A, the emery or sharpening wheel, mounted 011 the arbor A", journaled in the front part of the sweep B, as shown in Figs. 1 and 2. Motion is transmitted to the emerywheel from the pulleys A, A and A.

The sweep B consists of two members, I) Z),

' as shown in Fig. 2, the back ends of which are secured in the standards a a, just below the journal-bearings of the driving-shaft A,by the adjustable pivot clamping bolts (6* a, as shown in Figs. 8, 4, and 5. The standards a a are each provided with an elongated slot, (6, as shown in Fig. 3, by which means the sweep may be shortened or lengthened, thus moving the emery-wheel forward or back, as may be required in bringing the same to the proper position relative to the saw. The adjustingscrews a are inserted from the back part of the standards a a and have a bearing on the pivot-bolts a a", as shown in Fig. 5, whereby the back ends of the sweep B may be adjusted to a fixed position.

The inner side or member, b, of the sweep 33 is set lower at the back end than the companion member, as shown in Fig. 4. The object in having one side of the sweep lower than the other is to impart a slight tilting and lateral movement to the emery-wheel, in order to bring the grinding-surface of the same square against the face of the saw -tooth after the e1nery-wheel is well down in the gullet. This prevents the edge of the emery-wheel from coming in contact with the point of the tooth at first and rounding off the same before the wheel is steadied. The front end of the sweep B supports the emery-wheel, the same being provided with suitable journalbearings therein.

The upper ends of the yoke 13 (shown in Figs. 1 and 3) are detachably secured to the under side of the sweep B, the lower end of this yoke being connected to the upper end of the rod B*, the lower end of said rod being adjustably' connected to the horizontal curved bar 13 bymeans of the clamping-bolt If, inserted through the elongated slot b in said bar, as shown in Fig. 1. The bar 13 is also provided with the notched surface a by which means the lower end of the rod B may be set to an exact position. The outer end of the bar B is pivoted to the post 6*, while the inner end is provided with the jourualed roller If, as shown in Figs. 1, 6, and 8. This roller has a frictional or rolling contact with the irregular compound cam 0, by which means this end of the bar B is made to rise and fall, i1n parting a corresponding movement to thesweep and emery-wheel. Shifting the lower end of the rod 13 toward the compound cam has the effect of raising the emery-wheel higher, and set in the opposite direction shortens the stroke. The irregular compound cam is composed of three parts, the center part, 0, being the cam proper, which is loosely mounted on its rotating shaft B", as shown in Fig. 8. A second part of this cam consists of the piece 0, pivoted at Z) to the front side of the cam. O, and adjustably secured in relation to the same by the clamping-bolt b inserted through the segmental slot 21 in the piece 0 and tapped into the cam proper. By this arrangement the piece 0 may be set outward to any desired degree and caused to project beyond the surface of the cam O at one point in theplane of rotation, as shown in Figs. 6 and 7. hen set outward the piece 0 has the effect of producing a slimmer tooth with a finer point, and

when set inward a more stubby tooth with a heavier point is the result. This construction readilyenables the operator to conveniently adjust the machine to impart the proper form to the teeth, as may be required in accordance with the nature ofthc material to be cut, and also when there is frost in the wood.

The third part of the compound cam is the piece 0', attached to the back side of the same by means of the clampingbolt I)", inserted through the segmental slot 6 and tapped into the cam O, as shown in Figs. 6 and S. The piece 0 is provided with the hub B", and mounted on the shaft B, and secured to the same by the set-screw b. The raised sharp surface (I on the part 0 forms a guide for the shifting and the setting of the cam O, which is provided on that side with the scale of gradir ating-lines (2. By slacking back the bolt Z), the cam C may be rolled either backward or forward on its shaft and set to any desired degree or position. By this arrangement the size of the gullet in the saw-plate between the teeth is determined and gaged, the cam C being rolled or set in one direction to produce a smaller gullet or throat and in the opposite direction for a larger gullet. The shaft B extends from the front to the back end of the machine at right angles to the main drivingshaflt and is journaled in the supporting framewor z. i

The cam D is mounted on the projecting front end of the shaft B and is provided with the continuous groove d as shown in Figs. 1 and 8. The inner end of the lever D is provided with a roller, as indicated by dotted lines, which has a rolling engagement in the groove d as the cam revolves. The opposite end of this lever is pivoted to the lower end of the curved swinging bar D", the upper end of said bar being loose, so as to admit ofaswinging movement on its pivot. This bar is provided with the elongated slot (1 and the notched rack-surface d, so thatthe connecting end of the rod D may be conveniently adj usted or set to a positive position relative to the barD". The opposite end of the connecting-rod D is pivoted to the feed-arm Dflwhich is in turn pivoted at the lower end to the frame. The back end of the feed-finger d is pivoted to the upper end of the feed-arm, the loose end of said feed-finger being adapted to engage with the teeth of the saw and feed the same forward in regular order as the process of sharpening progresses. Motion is communieated to said feed-finger from the grooved cam D through the intermediate connections described. By lowering the end of the rod D connected to the bar D the throw of the feedfinger is shortened, while by raising the same the throw is lengthened, thus enabling the proper adjustment to be conveniently and quickly made for different saws. The saw is supported on the spindle d and clamped between the two collars thereon, as shown in Fig. 1. The slide d is connected with said spindle and the horizontal screw-shaft (1 by which means a lateral adjustment is given to these parts to bring them to the proper horizontal position. The vertical adjustment of the saw is accomplished through the medium of the vertical screw-shafts E E, motion being transmitted from one to the other by the shaft E", having beveled pinions mounted on each end and engaging with corresponding pinions on the shafts E E. The cross-bar E has a threaded engagement with said vertical screwshafts.

E is an adjustable device for clamping and stiffening the saw-plate near the edge.

One end of the spring F (shown in Figs. 1, W

2, and 3) is connected to the sweep B, the opposite or lower end being hooked in one of the notches of the rack-bar F. The function of this spring is to assist in the movement of the sweep when it is necessary to operate the same by hand. \Vhen the machine is operated by power, theloose end of the springis disengaged from the rack-bar. Motion is transmitted from the main driving-shaft to the shaft 13* through the medium of the pulley H, mounted on said main shaft and having a belted connec tion with the pulley H on the shaft H". (Indicated by dotted lines in Fig. 1.) The shaft H is provided on one end with the pinion 71, also shown in dotted lines, which engages with the gear-wheel H mounted on the shaft B.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a saw-sharpening machine, a sweep supporting a grinding-wheel in the front end and provided with pivotal bearings at the back end, and having an endwise adjustment, as described, in combination with the spring F and ineans for supporting the loose end of said spring, substantially as and for the purpose set forth.

2. In a saw-sharpening machine, a sweep consisting of the members I) I), provided with pivotal bearings at the back ends and having one of the sides or members comprising said sweep set at a lower point than the companion member, substantially as and for thepurpose set forth.

3. In a saw-sharpening machine, the combination, with a sweep consisting of the members b b, of the standards a a, provided with the elongated slot (t the pivotal bolts a a", and the adjusting screw or screws a, whereby said sweep is adapted to have an endwise adjustment, substantially as and for the purpose set forth.

4.. In a saw-sharpening machine, the combination, with a sweep, as described, having the pivotal bearing of one side lower than that of the companion side, of an emery or grinding wheel journaled in the front end of said sweep, substantially as set forth.

5. In a saw-sharpening machine, the combination, with a sweep provided with pivotal bearings at one end and supporting a j ournaled grinding-wheel in the opposite end, of the yoke B, the rod B the curved bar B pro= vided with an elongated slot and a notched surface, as described, the roller b the cam O, and the shaft 13*, whereby the required movementis imparted to the sweep and grindingwheel, substantially as set forth.

6. In a saw-sharpening machine, a compound cam consisting of the part 0, provided on the back side with graduating lines and loosely mounted upon its rotating shaft, the part 0, adjustably secured in relation to the part C, and the part 0 rigidly mounted on its shaft and provided with means for securing said part (3 to the part 0, whereby the latter may be adjusted to any desired position, in combination with the shaft B, the bar 13 provided with the roller If, the sweep B, and the means described for connecting said bar and sweep, substantially as and for the purpose set forth.

7. In a saw-sharpening machine, the com- 20 bination, with the grooved cam D, mounted upon the outer end of the rotating shaft B, of the lever D, having a roller engagement with said cam, the swinging bar D the rod D the feed-arm D, and the feed-finger d substan- 25 tially as and for the purpose set forth.

8. In a saw-sharpening machine, the combination, with the curved swinging bar D provided with the elongated slot (1 and the notched rack-surface (1*, of the connecting-rod D the feed-arm D", and the feed-finger (1 whereby the throw of said finger may be lengthened or shortened, as required, substantially as set forth.

MILO COVEL. Vitnesses: L. M. FREEMAN, L. B. GOUPLAND.