US 1977418 A
Description (OCR text may contain errors)
Oct. 16, 1934. G, W|NKLER 1,977,418
KNIFE SHAHPENER DEVICE Fild Oct. 21, 1950 I lllllllllll m INVENTOR HERMAN 6. WIN/(LE8.
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d screws 13 taken through the plate 11.
Patented Oct. 16, 1934 *UNiTED STATES kNiFE SHARIENERDEVICE:
Herman G. Winkler, Detroit, Mich.,"assignor to Barnes Scale Company, Detroit, Mich., a corporation of Michigan Application October 21, 1930, Serial No. 490,260
1 Claim. (01. 51- -248) ;This invention has to do with a knife sharpener device and particularly to a sharpener construction for use with a rotary knife, as most generallyemployed in slicing machines.
-While sharpeners for slicing machine disc knives are old, the present invention is directed towards the provision of a simplified construc- -tion, particularly as regards the mounting and controlmechanism .for two opposed sharpener One of these elements is primarily a grinding element; the other one for removing the burr on the cutting edge of the knife. A particular feature of the invention resides in the disposition of the burr-removing element, and the direction of movement of this element, having due regard to the point on the element, or place on the element, which contacts with the disc knife. More specifically, the burr-removing element is arranged so that the part thereof which contacts with the knife has a movement which is inwardly of the knife; in other words, at the point of contact of the burr-removing element with the knife the burr-removing element is moving across the edge of the knife from Without its periphery to within its periphery.
Fig. 1 is substantially a top plan view of the sharpeners, with the housing shown in section.
Fig. 2 is a section taken on line 33 of Fig. 2 illustrating the burr-removing element.
Fig. 3 is a section taken on line 4-4 of Fig. 1 illustrating the grinding element.
Fig. 4 shows diagrammatical illustrations of the two elements contacting with the knife.
A housing 4 of a slicing machine for housing a 5 a disc knife and in which the disc knife may be journaled may be of one piece casting construction and formed with a recess as at the recess is interior, a bulge appearing on the exterior and in this recess the sharpener con- 40 struction, at least in part, is disposed. The Sharpeners comprise an abrading element and a burr-removing element arranged to engage opposite' sides of the cutting edge and these elemerits are mounted in a unitary or assembled a manner. There is a bracket which may be in the form of a plate 11 adapted to be secured to the slicing machine as, for example, within the housing 10, and for this purpose the housing is provided with studs 12 for the reception of This plate has tubular members 15 and 16 for housing the spindles of the sharpener elements. As shown in Fig. 1, these tubular elements are arranged angularly as regards the plane of the disc so that the sharpener elements, including both the abrasive element and the burr-removing'element, properly. engage the knife. This will-be. explained more in detail later on.
The abrasive element is shown at 20 and by means of a screw 21 is fastened to a spindle 22. m This spindle is located within a sleeve 23 closed at one end by a cap .24 screw threaded thereon with a thrust bearing 25 on the end of the spindle 22 held by means of a screw 26. A coil spring 27 is located between the cap and the end of the tubular element 15 while the cap itself has a projection 28 provided with a head 29.
It will be noted that the assembly of the spindle, sleeve, thrust washer, spring and so forth, are located inthe tubular member 15 and that the 7Q spindle and sleeve are axially shiftable and are acted upon by the spring 2'7. At the same time, the abrasive element and spindle 22 are rotatable irra sleeve 23.
The burr-removing element as shown at 30 is mounted in tubular element 16 by means of a spindle 31 upon which the element may be threaded, the spindle being within a sleeve 32 shiftable axially in tubular member 16 and acted upon by coil spring 33, there being a thrust bearing 34 on the end of the spindle held by screw 35. A cap 36 closes over the bearing. Accordingly, it will be noted that element 30 and its spindle may rotate yet shift axially with sleeve 32.
The two elements are made shiftable by a single control and for this purpose there is a rocker member or lever 40 fulcrumed upon a screw 41 mounted in the plate 11 and adjustable therein upon its screw threads and capable of being held in adjustment by a nut 42. The lever 40 has forked ends 43 which engage under enlargements 29 and 44 of the abrasive unit (Figs. 2 and 3). An adjusting screw is shown at 45, the screw being threaded into the housing 10 having an knurled head 46.
As the screw 45 is rotated one way or another, the rocker member 40 is rocked. Let us assume that the screw 45 is screwed inwardly of the housing, viewing Fig. 1; this shifts the burr-removing element from right to left (Fig.
2) thus compressing spring 33; it also shifts the abrasive element from left to right (Fig. 3) against action of the spring 27 due to the fact that the forked end of the lever 40 lies under .105 head 29. Inasmuch as the disc knife is located between these elements, each draws away from the knife in this action.
To bring the sharpener elements into place the screw 45 is backed away; the spring 33 T10 thus urges the burr-removing element 30 against one side of the knife, the spring 27 urges the abrasive element 20 against the other side of the knife.
In Fig. 4 there is a diagrammatic showing illustrating the arrangement of the parts. The abrasive element, due to its angular disposition, engages the knife substantially at the point at. The knife is rotating counter-clockwise as indicated by the arrow and the abrasive element 20 is also given a counter-clockwise rotation due to its frictional contact at point :0 with the knife. By reference to Fig. 1, it will be noted that the burr-removing element 30 is located at an angle or rather in a plane which is slightly angular as regards the plane of the knife; the arrangement is such that the knife and the burrremoving element engage substantially at the point 1). The burr-removing element, due to its frictional contact at 12 with the knife is given a clockwise direction of rotation. It will be noted therefore that at-the point of contact with the knife the burr-removing member is moving inwardly; that is to say, across the cutting edge of the knife exteriorly thereof toward the interior .of the knife or in a general direction toward the center of the knife. With this sort of action the small burrs on the edge of the knife are engaged and bent at a sharp angle .upon themselves with the result that they are broken off. A better understanding may be had if it be pictured that the burr-removing element is rotated in the opposite direction; this action would cause the burrs merely to straighten out and project from the cutting edge of the knife rather than by bending down along the face of the knife to be broken off.
It is feasible and within the invention to mount the sharpeners as described herein and provide them with positive rotation while, as shown herein, the sharpener elements are merely idlers and get their rotation from their frictional engagement with the knife.
A sharpener structure for a rotary disk knife comprising, an abrading member, a burr-removing member, said members being disposed on opposite sides of the knife near its edge, each of said members being mounted for rotation upon a fixed axis, a spring acting upon each member normally tending to urge each member oppositely as regards the other and into engagement with the knife, a manually operable screw threaded control member disposed substantially on the axis of one of the sharpener members and adapted to shift the said one sharpening member out of engagement with the knfe against the action of the spring acting thereon, a rocker arm interconnecting the two sharpening members, and an adjustable screw threaded fulcrum for the rocker member disposed between the two sharpening members whereby the said manually operable member in shifting one sharpening element away from the knife edge against the action of the spring acting thereon effects shiftingof the other sharpening element but in an opposite direction away from the knife edge throughthe means of said rocker. arm. HERMAN G. WINKLER.