Metal tools and implements – making – Tool sharpeners – Cutting
Patent
1996-10-28
1998-07-07
Watts, Douglas D.
Metal tools and implements, making
Tool sharpeners
Cutting
451404, B24B 336, B24B 346, B24B 352, B26D 712
Patent
active
057751803
DESCRIPTION:
BRIEF SUMMARY
The present invention relates generally to a sharpening apparatus, and in particular to a device for sharpening blades of a cutting implement or apparatus. Even more particularly, the present invention relates to an apparatus for sharpening rotary blades having a plurality of cutting teeth located around the circumference of the blade. The present invention finds particular application in sharpening the teeth of rotary blades for use in a rotary shearing handpiece, especially a rotary shearing bandpiece for shearing sheep, among other animals.
Although the present invention will be described with particular deference to a device or apparatus for sharpening the teeth of rotary blades of a rotary shearing handpiece for shearing sheep, it is to be noted that the present invention is not limited to the described embodiment or embodiments but rather the scope of the present invention is more extensive so as to include other arrangements of the device or apparatus and other applications of using the device or apparatus in whatever form it takes for whatever use.
One problem associated in general with cutting devices is being able to maintain the cutting edge or similar of the cutters or similar of the device or of components forming the device in a sharp condition for their effective or efficient use. Even after a small amount of use the cutting surfaces, edges, blades or the like of cutting implements become blunt which reduces their efficiency and may even cause damage to the material being cut. This is particularly so in the case of shearing wool from sheep where foreign material, such as for example, sand, dirt, grit or the like become entangled in the wool, particularly in dusty or dirty environments which causes wear on the cutting blades as the foreign material contacts the blades. Such problems usually occur in harsh conditions or environments which makes it even harder for the sheep and shearers. Even after a small amount of use the shears being used by the shearers to shear the sheep in the harsh or adverse environments are significantly blunted which reduces the efficiency of the handpiece which in turn results in a poorer cut to the wool and in extreme circumstances to damage to the sheep from cuts, nicks, scratches, abrasions and the like, which has the effect that the fleece is of less commerical value and the sheep require veterinary treatment.
When the blades of a handpiece become so blunt as to be unusable the shearer must then stop shearing and either replace the blades with sharp blades or sharpen the blades which results in the loss of productivity due to the downtime time it takes to replace or sharpen the blades during the working day or a reduction in the amount of free time available to the shearer if the blades are resharpened after hours. As shearers are usually paid in accordance with the number of sheep they shear per day, any time during the day during which the shearers are prevented from shearing which is lost erodes the available time for shearers to earn money. Such lost time reduces the income of the shearer and adds generally to the cost of the shearing exercise.
Another problem encountered in sharpening blades of shearing equipment is the amount of time and effort required to sharpen the blades, this is particularly so in the case of rotary blades having a plurality of teeth located around the circumference of the blade as each tooth must be individually sharpened and optionally reprofiled which requires that each tooth be accurately positioned before the set of each tooth is accurately cut or generally reset so that the blade can be sharpened. The positioning of the tooth prior to sharpening, resetting or reprofiling each individual tooth is laborious and time consuming.
Therefore, there is a need to provide a device or apparatus and method or process for sharpening blades of a cutting device, particularly a rotary blade having a number of cutting teeth, in a quick and efficient manner, which additionally allows more than a single blade to be sharpened at the one time and whi
REFERENCES:
patent: 2513671 (1950-07-01), Perry
patent: 2801554 (1957-08-01), Iveson
patent: 2885911 (1959-05-01), Minici
patent: 2896481 (1959-07-01), Hebbert
patent: 3881888 (1975-05-01), Schwab
patent: 3900970 (1975-08-01), Sollami
patent: 4040313 (1977-08-01), Lustgraaf
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