US453431A - schmaltz - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1.

' F. SOHMALTZ.

SAW SHARPENING MAGHINE. No. 453,431. Patented June 2,1891.

(No Model.) 3 sheets sheet 3.

F. SCHMALTZ. SAW SHARPENING MACHINE.

.No. 453,431. Patented June 2, 1891 [WEB/Z072, 1626a]; JdmaZi/g THE Numus wzrzns 0a., wwrcwuwm WASNINGTON, o, c.

UNITED STATES PATENT OFFICE.

FRIEDRICH SOHMALTZ, OF OFFENBACH-ON-THE-MAIN, GERMANY.

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 453,431, dated June 2, 1891.

Application filed October 22, 1889. Serial No. 827,862. (No model.) Patented in Germany January 8, 1888, Nos. 45,747 and 47,616, and in England June 15,1889, No.16,3'73.

To all whom it may concern:-

Be it known that I, FRIEDRICH SCHMALTZ, a resident of Oifenbach-on-the-Main, Germany, and a subject of the Grand Duke of Hesse, have invented certain new and useful Improvements in Machines for Sharpening Saws, (for which I have obtained Letters Patent in Germany, No. 45,747 and No. 47,616, dated January 8, 1888, and in Great Britain No. 16,373, dated June 15, 1889,) of which the in the claims.

In the accompanying drawings, Figure 1 is a front view of a machine constructed in accordance'with my invention. Fig. 2 is a side view of the same. Fig. 3 is a back view. Figs. 4 to 11 are detail views of different parts.

In the said drawings, the reference-numeral 1 designates the frame of the machine, in which is mounted the main shaft 2, carrying a driving-pulley 3.

Mounted upon the oscillating frame 4,pivoted in a support secured to the frame 1 is the grinding-disk 6 driven by means of belt 8, passing over pulleys 3 and 4, and also over the intermediate pulleys 9 9. The frame 4 can oscillate on its pivots 10, so as to elevate and depress the grinding-disk, and it is provided at its rear with an extension 12, pivoted thereto at 13 and provided with a forwardly-extending arm 14, projecting under the end of the bar.

15 is a set-screw carried by frame 4 and bearing against the arm 14 of the extension 12, whereby the frame 4 may be raised orlowered and the grinding-disk very finely adj usted with relation to the saw.

Mounted in the frame of the machine is a shaft 16, having at one end a pulley 17, which is driven by a belt 18, passing over pulley 19 on shaft 2, and also over the inclined idler 20 on the frame 1. This shaft 16 carries a crank-wheel 21 and at its opposite end a similar wheel 22. This wheel 21 serves to raise and lower the frame 4 and its grinding-disk by means of a chain 23, connected with the extension 12, the lever 24, pivoted in arm 25, secured to frame 1, and the connecting-rod 26, connected at one end with the lever and at the other end with a pin or crank 27, secured in the groove 28 of wheel 21. By changing the position of the pin in this groove of the said wheel the movement of frame 4 and the grinding-disk will be changed. Then grinding disk fall, owing to its overweight.

Upon further revolution of the wheel, however, the lever will be depressed, causing the chain 23 to depress extension 12, and consequently raising frame 4 and the grinding-disk. These operations will be continuousthat is to say, at each revolution of wheel 21 the grinding-disk will be elevated and depressed to bring it out of and into contact with the teeth being sharpened.

The pivot 10 of the frame 4 is mounted in a rotatable frame 29, pivoted by means of pivot-bar 30 in the support 5, so that a lateral adjustment may be given to the frame and grinding-disk, as well as a vertical oscillating movement.

The wheel 22 is similar to wheel 21 in construction, and theopin or crank 31 thereof is connected with a rod 32, which in turn connects with the two-armed pivoted lever 38, which actuates a trigger-hook 34 to move the saw forward after a tooth has been sharpened and present a new tooth to the action of the grinding-disk. During one half of the revolution of wheel 22 the trigger-hook slides over the back of the tooth, to then fall into the groove between the two teeth, and during the other half of the revolution the trigger engages with the tooth and moves the saw forward.

By the mechanism described above all the outlines of a saw-tooth may be operated upon by the grinding-disk.

To provide for what I term a balancing motion of the saw, whereby the same may be given a lateral oscillating motion, so that the grinding-disk may form the side and top bevels seen in Fig. 11,1 provide the following mechanism: The saw is fixed in a slide 34, which is movable horizontally on the rail 35. This rail is connected with a similar parallel rail 36 by means of the pivoted connectingrods 37, and said rail 35 maybe adjusted vertically to the proper height by means of bent or two-armed lever 38, pivoted or fulcrumed to rail 36 at 38, the upper arm of said lever being pivoted to rail 35, while the lower arm is connected by means of rod 3S with footlever 39, fulcrumed to the machine-base at 40. By depressinglever 39 rail 35 is elevated, and vice Versa. Connected with rail 36 is a bowpiece 41, which is also connected with the eccentric-rod 42. This rod 42 gives the lateral oscillating motion to the saw. It rests in curved bearings in a circular segment 43 on the support. 44, secured to frame 1, so that as it is oscillated, as hereinafter described, it will describe an arc of a circle in said segment. At its bottom it is provided with a curved foot-bearing 44. This rod is placed at the side of the oscillation-plane of the grinding-disk, so that as the rod is oscillated, as hereinafter described, the saw is brought alternately obliquely to the right and left of the grinding-disk, and is contacted by the same, not at its lowest point, but with two corresponding points located higher to the right and left of the same, so that the sides of the cutting-disk form the cutting-faces.

The cutting-face of a tooth and the back of the next preceding one having an equallydirected inclination,or are beveled in the same direction, this inclination or bevel is changed at the following cutting-line. (See Fig. 11.) The change of position of the saw must therefore take place suddenly, bya jerk, and at the time that the cutting-disk leaves the back of atooth-that is to say, always after a full revolution of shaft 16. This movement of the rod 42 is effected by means of shaft 45, mounted in frame 1, and carrying a gear-wheel 46, meshing with a similar wheel 47 on the shaft 16, these gears being so proportioned that wheel 46 makes a half-revolution only while wheel 47 makes a full one. The shaft 45 carries a disk 48, provided with a pin 49, which e11- gages with a pceuliarly-outlined sliding plate 50. As shown in Fig. 8, this sliding plate consists of a rim having a central oval-shaped recess, and at its longest diameter is provided with two recesses or indentations so that the pin 49 (see Fig. 10) will engage with one of said recesses in its way from a to Z2 and from c to (Z, causing it to move quickly to one side while the plate remains stationary when the pin travels from b to c or from d to a. The curves 1) c and d (b are arcs of circles, with the same radius as the motion of the pin 49.

Connected with plate 50 by means of lugs 53 (see Figs. 6 to 9) is a plate 54, which transmits the jerking motion thereof by means of short shaft 55 to a second plate 56, secured to the rod 42. This oscillation of rod 42, through the medium of the how 41 connected therewith, oscillates the rails 36 and 35 and causes the saw carried by the latter to be presented obliquely to the cutting-disk.

The plates 54 and 56 are provided with slots 57 and ribs 58, which form ways for the slide 59, which carries shaft 55, so that said shaft is horizontally adjustable therein, so that the stroke of plate 56 may be varied and a greater or less play allowed the rod 42, resulting in the saw being presented more or less obliquely to the grinding-disk.

The circular segment 43, which serves as the upper support of the rod 42, has an extension 60, against which the saw rests. (See Fig. 7.)

The frame-piece 63, Fig. 5, the bolt 64, with screw-nut 65, and the compression-rod 66, retating around bolt 64, serve the purpose of pressing the saw against its supports. The frame-piece 63 and rod 66 have oblique contact-surfaces fitting on and pressed against each other by the screw-nut 65. The rod 66, therefore, can be so placed, by suitably placing the same and setting the nut 65, that it exerts the necessary pressure upon the saw without interfering with a regular forward movement of the same.

To temporarily stop the grinding-disk and the mechanism for advancing the saw, I provide the following means: The support 5 carries a small shaft 68, (see Figs. 2 and 7,) having on one side a small hand-wheel 69 and an eccentric 70, and on the other side an arm 71, securely fixed to said shaft, and a lever 72. By turning handwheel 69 the eccentric 70 is made to catch under a projection 7 3 on frame 4, and the same and thegrinding-disk are elevated and the latter thrown out of engagement with the saw. At the same time the trigger-hook 34 is withdrawn from the saw by means of the lever 72, and the forward move ment thereof is stopped. In reversing the hand-wheel and lowering the grinding-disk, the lever 72 is also lowered and the triggerhook returned to its former position to feed the saw. In this way there is no liability of interference between the grinding-disk and the advancing mechanism.

Having thus described my invention, what I claim is- 1. In a saw-sharpening machine, the com bination, with the pivoted frame, and a grinding-disk journaled in one end of said frame, of the wheel 21, aconnecting-arm 26,1ever 24, extension 12, and chain 23, substantially as described.

2. In a saw-sharpening machine, the com- IIO bination, with the vertical eccentricallymounted rod 42 and the upper support 44, of the segment 43 on said support, the framepiece 63, the bolt 64, screw-nut 65, and compression-rod 66, substantially as described.

3. In a saw-grinding machine, the combination, with the shaft 45, the disk 48, having pin 49, and. the sliding plate 50, having ovalshaped recess and depressions 50, of the plate 54, connected With plate 50, the plate 56, connected by shaft 55 with plate 54, the eccentric-rod 42, the bow-piece 41, and the connected rails 36 and 35, substantially as described.

4. In a saw-sharpening machine, the combination, with the shaft 45, the disk 48, having pin 49, and the sliding plate 50, having oval-shaped recess and depressions 50, of the plates 54 and 56, the shaft 55,said plates having slots 57 an'dribs 58, the slide 59, the eccentric-rod 42, the bow-piece 41, and the connected saw-carrying, rails 36 and 35, substantially as described.

5. In a saw-sharpening machine, the combination, With the pivoted frame 4, provided with extension 12, pivoted thereto at 13, and provided with a forwardly-projecting arm 14, of the pressure-screw 15, carried by frame 4 and bearing against arm 14, substantially as described.

6. In a saw-sharpening machine, the combination, with the frame 4 and the grindingdisk carried thereby, of the eccentric 70, the shaft 68, the projection 73 on frame 4, the arm 71, and lever 72, substantially as described.

7. In a saw-sharpening maehine, the com bination, with the slide 34, the rail 35, the parallel rail 36, connecting-rods 37, and levers 3S and 39, substantially as described.

In testimony that I claim-the foregoing as my own I have hereunto affixed my signature in the presence of two Witnesses.

FRIEDRICH SOHMALTZ.

Witnesses:

ALVESTO S. IIOGUE, JEAN GRUND.

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