Geometrical instruments – Gauge – Collocating
Reexamination Certificate
1999-04-28
2001-10-09
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Gauge
Collocating
C033S520000, C033S633000, C033S642000
Reexamination Certificate
active
06298573
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a device for centering tools, such as saw blades, rotary cutters and the like which are circular and which have bores of different sizes, on processing machines such that they can be positioned about their center axes. More particularly, the present invention relates to a saw blade centering device having a mounting plate adapted to be attached to such a machine, a first and second bearings on the plate, and a third bearing mounted for movement on the plate toward and away from the first and second bearings. The first, second, and third bearings are engageable with the bore of the blade such that the bore is centered on the machine and the blade is rotatable about its center axis.
BACKGROUND ART
It is well known in the art that cutting tools such as industrial saw blades are provided with center bores (openings) having a variety of sizes. In order to sharpen such tools, it is necessary to position them on machines like grinders such that they are Orotatable about their true center axes. This is commonly handled in shops that process (sharpen) such saw blades by providing, with each machine, a rather large quantity of bushings for selective trial in the saw blade to be finished. While this approach is commonly used, it is difficult and time consuming to find the right bushing to center each saw blade brought to the machine.
Some machinists have provided rather complex mechanisms comprising three jaws and a mechanism for moving the jaws radially outwardly and inwardly selectively to fit a blade. These mechanisms, however, are rather complex and are difficult to use for a wide range of bore sizes.
The device of the present invention is primarily concerned with centering saw blades having different bore sizes on a processing machine. The centering device comprises a mounting plate to be placed on a processing machine having a first, a second, and a third bearing. The third bearing is movable away from or toward the first and second bearing to tighten against the saw blade bore centering the blade onto the grinder movable about the center axis of the blade.
SUMMARY OF THE INVENTION
According to other features, characteristics, embodiments and alternatives of the present invention which will become apparent as the description thereof proceeds below, the present invention provides a device for centering tools, such as saw blades, rotary cutters and the like which are circular and which have bores of different sizes, on processing machines such that they can be positioned about their center axes.
According to one embodiment of the invention, the centering device includes a mounting plate to be placed on a processing machine such as a saw blade grinder. The plate has a first, a second, and a third bearing that engage the bore of the blade. The third bearing is movable away from or toward the first and second bearing to tighten against the saw blade bore pulling it snugly against the first and second bearing. The saw blade is then centered on the grinder movable about the center axis of the blade and the bore. Each tooth of the saw blade can then be presented to a grinding wheel or other cutting device such that each tooth will be finished relative to the true center of the blade.
In a further illustrative embodiment of the present invention, the third movable bearing may be movable along an inclined angle relative to the center line of the centering device. Positioning the bearing at some relative inclination to the center line may allow the bearing to achieve better centering and holding characteristics to the bore. This range of inclination may extend to and exceed 15° depending on the size of the cutting tool bore.
According to further embodiment of the invention wherein the center bore of the cutting tool includes a keyway, the device includes a bridging bearing fitted on the first and second bearing and having a circular outer peripheral edge. Another bridging bearing attaches to the third bearing also having a circular outer peripheral edge. The bore of the saw blade having the keyway engages and is movable about the peripheral edges of the bridging bearings. This smooth circular outer surface will permit the keyway to be moved about the axis of the saw blade smoothly and still control the movement about the center of the blade. The bearings will accommodate most keyways of any size and configuration.
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Neukam Russell E.
Segal John M.
Barnes & Thornburg
Gutierrez Diego
North American Products Corporation
Smith R. Alexander
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