Abrading – Machine – Rotary tool
Patent
1992-04-29
1995-02-21
Lavinder, Jack W.
Abrading
Machine
Rotary tool
451196, 451 45, B24B 336
Patent
active
053904451
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a knife sharpening machine, according to the preamble of the main claim.
BACKGROUND ART
Machines of this kind are disclosed in GB-A-168, 147.
It is common practice to set the grinders close together, but not in mutual contact; a knife to be sharpened is moved through the gap between the grinders such that the latter will restore the knife to a sharp edge by their abrasive action.
In this way, fully satisfactory results cannot be attained, however, because of the knife blade acquiring a cross-sectional shape which substantially duplicates the geometry of the two facing grinders, that is, a concave shape of its sides. This feature is objectionable both because it provides no knife edge of zero thickness (thereby requiring an additional finishing step), and because it weakens the sides of the knife blade. Ultimately, the quality of the sharpening action afforded by such prior machines is much poorer than that to be obtained manually by a skilled knife grinder.
DISCLOSURE OF THE INVENTION
It is an object of this invention to provide a knife sharpening machine which can impart a convex profile to the knife blade at the edge region thereof.
This object is achieved, according to the invention, by a knife sharpening machine according to the characterizing clause of the main claim.
Thus, the grinders will process the knife to a convex profile which duplicates the arcuate travel path of the grinders, thereby avoiding all the drawbacks which associate with sharpening to a concave profile.
Advantageously, the arcuate paths travelled by the two grinders are symmetrical about the plane containing the knife.
Also advantageously, the two grinders are held in mutual contact and travel their respective arcuate paths in opposite directions from each other, thereby as one of said grinders, is at work on the edge of the knife, the other grinder is at work on the side thereof.
Preferably, this machine comprises: a table journalled to the framework along a parallel axis to the knife edge and laid on the knife plane, a pair of arms pivoted to the table at symmetrical locations relatively to the table pivot axis, each of said arms carrying a respective one of said grinders, a pair of arcuate profile cams mounted on the framework, a pair of feelers, each mounted to one of the arms at the location of a respective grinder and in contact engagement with a respective one of the profile cams, said table being oscillated so as to reciprocate the grinder holding arms back and forth.
Preferably, the grinders are made of a compressible resilient material and the profile cams are provided with screw means of adjusting their setting on the framework and accommodating the grinder wear.
Further features and advantages of a machine according to the invention will be more clearly understood from the following detailed description of a preferred embodiment thereof, to be read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
FIGS. 1, 2 and 3 are front views of a machine according to the invention, shown at different stages of its operation; and
FIG. 4 is a diagram schematically illustrating the operation of the machine in FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
Generally shown at 1 in the drawing views is a knife sharpening machine. The machine 1 comprises a supporting framework 2 of substantially gantry-like construction. The framework 2 carries a means 3 of holding a knife C being sharpened so as to locate the latter at a sharpening section or zone 4. Active at said sharpening section 4 are two disk grinders, both designated 10.
Each of the two grinders 10 is supported rotatively on a respective arm 11 close to one end of the latter; each arm 11 is pivoted, with its opposed end, to a table 14 caused to oscillate about a pivot 15 on the framework 2 relatively to a parallel axis to the knife edge lying within the knife profile.
The two arms 11 are pivoted to the table 14 in symmetrical positions about the pivot 15.
Fast with the table 14 is a center jib 16 w
REFERENCES:
patent: 806551 (1905-12-01), Martin
patent: 1836064 (1928-08-01), Boche
patent: 2581157 (1952-01-01), Whitcomb
patent: 2617235 (1952-11-01), Lindahl
patent: 3610098 (1971-10-01), Walker
patent: 4265055 (1981-05-01), Cartwright
Cremascoli Loredana
Giovanazzi Enzo
Cremascoli Loredana
Lavinder Jack W.
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